Table of contents

 

Index to observations received from ARPS members

 

Observations received FROM ARPS MEMBERS

 

January 2010

 

Astrometry

 

Peter Birtwhistle

 

December 2009

December provided a reasonable amount of observing time but the number of NEOs discovered by the surveys was much reduced, 34 new objects compared to the 116 they picked up in November, so NEO follow-up work was quieter than of late. As well as following objects on the NEO Confirmation page, the opportunity was taken to follow 2009 WZ104 on several nights to try and determine its light curve. This is an Aten discovered on Nov. 25 by the Catalina Sky Survey and was brighter than 17th mag. for the first two weeks in December. However, not enough coverage was obtained to be able to find an unambiguous period, but it is likely to be longer than 6-8 hours.

 

The unusual artificial satellite 9U01FF6 mentioned last month in TA Vol 46 No 548 p211 (2009) which is in a 30+ day, very elongated orbit, taking it as close to us as 5 Earth diameters and about twice as far as the Moon at apogee, was picked up again on Dec. 27, three days before perigee. It was only 5" from the prediction calculated with FindOrb using positions from the previous two returns and taking into account Solar Radiation Pressure. Unfortunately the weather stopped any further observations but it should be visible next on the night of 6th Feb. 2010 and then in March a relatively long apparition, from the 11th-15th.

 

2009 overall was an exceptionally good year for observing at Great Shefford, producing the best observing figures since my observatory was commissioned in May 2002. Several statistics follow, with the previous best figures and year in parentheses: The most nights used (202 vs. 183 in 2003), the most hours spent at the telescope (938h vs. 838h in 2005), the largest amount of time the CCD shutter was open (24d 00h vs. 22d 03h in 2007) and far and away the largest number of images taken in a year (148,361 vs. 92,025 in 2007). That last statistic is in part to do with more Minor Planet photometry being done in 2009 than before, with many objects being followed for long periods of time, collecting many images during a night. The total number of images taken since 2002 passed the 1/2 million mark during the year and now stands at 570,575.

 

2009 generally seems to have beaten my previous records by 8-12% all round. Lets hope 2010 doesn't let us down!

 

13089        KC2009 12 25.90247 05 00 05.09 +24 58 41.5                      J95 = MBA

13089        KC2009 12 25.91824 05 00 04.30 +24 58 37.8                      J95

13089        KC2009 12 25.92431 05 00 04.01 +24 58 36.3          17.4 R      J95

 

35015         C2009 12 10.84439 04 55 59.06 +20 47 28.7                      J95 = MBA

35015         C2009 12 10.85017 04 55 58.72 +20 47 26.7                      J95

35015         C2009 12 10.85593 04 55 58.35 +20 47 24.4          17.8 R      J95

 

85834         C2009 12 10.84439 04 55 57.32 +20 55 07.2                      J95 = MBA

85834         C2009 12 10.85017 04 55 56.93 +20 55 07.2                      J95

85834         C2009 12 10.85593 04 55 56.54 +20 55 07.1          17.7 R      J95

 

97527        KC2009 12 20.95114 05 21 14.83 +25 37 26.7                      J95 = MBA

97527        KC2009 12 20.97756 05 21 13.36 +25 37 23.8          19.4 R      J95

 

A4178        KC2009 12 20.83796 02 25 29.83 +13 33 08.9                      J95 = MBA

A4178        KC2009 12 20.91889 02 25 29.39 +13 33 30.5          19.3 R      J95

 

F5012        KC2009 12 20.83796 02 25 40.88 +13 28 07.6                      J95 = MBA

F5012        KC2009 12 20.91889 02 25 41.92 +13 28 13.2          19.6 R      J95

 

I9595        KC2009 12 25.90247 04 59 53.31 +25 01 10.9          18.5 R      J95 = MBA

I9595        IC2009 12 25.91824 04 59 52.43 +25 01 08.8                      J95

I9595        IC2009 12 25.92431 04 59 52.13 +25 01 07.2                      J95

 

M2573        KC2009 12 20.83796 02 24 53.27 +13 27 15.5                      J95 = MBA

M2573        KC2009 12 20.91889 02 24 52.32 +13 27 25.1          19.5 R      J95

 

M5403         C2009 12 10.84728 04 56 27.29 +20 55 51.1                      J95 = MBA

M5403         C2009 12 10.85880 04 56 26.62 +20 55 51.6                      J95

M5403         C2009 12 10.87064 04 56 25.96 +20 55 49.8          19.4 R      J95

 

     K01TC7L  C2009 12 10.84728 04 56 31.22 +20 51 55.0                      J95 = MBA

     K01TC7L  C2009 12 10.85880 04 56 30.48 +20 51 51.7                      J95

     K01TC7L  C2009 12 10.87572 04 56 29.41 +20 51 46.4          19.8 R      J95

 

     K03T03Q KC2009 12 27.96857 06 56 59.72 +36 14 38.8                      J95 = MBA

     K03T03Q KC2009 12 27.97433 06 56 59.35 +36 14 38.6                      J95

     K03T03Q KC2009 12 27.98011 06 56 58.95 +36 14 38.0                      J95

     K03T03Q KC2009 12 27.98587 06 56 58.55 +36 14 37.6                      J95

     K03T03Q KC2009 12 28.00227 06 56 57.52 +36 14 37.0          19.0 R      J95

 

     K03UD5C KC2009 12 20.95114 05 20 49.41 +25 24 23.9                      J95 = MBA

     K03UD5C KC2009 12 20.96606 05 20 48.61 +25 24 22.7          20.1 R      J95

     K03UD5C KC2009 12 21.02986 05 20 45.03 +25 24 18.8          19.9 R      J95

 

     K09V70Z KC2009 12 20.95114 05 21 22.61 +25 28 04.9                      J95 = MBA

     K09V70Z KC2009 12 20.97756 05 21 20.88 +25 28 06.5          20.1 R      J95

     K09V70Z KC2009 12 21.02986 05 21 17.46 +25 28 10.0          20.6 R      J95

     K09V70Z KC2009 12 22.90947 05 19 17.91 +25 30 13.2          20.6 R      J95

     K09V70Z HC2009 12 22.94440 05 19 15.68 +25 30 16.3                      J95

     K09V70Z KC2009 12 23.98771 05 18 10.03 +25 31 20.5          20.5 R      J95

     K09V70Z KC2009 12 24.00982 05 18 08.68 +25 31 22.3                      J95

     K09V70Z KC2009 12 24.01285 05 18 08.48 +25 31 22.2                      J95

 

     K09W01L KC2009 12 27.95454 05 18 45.41 +65 31 00.4                      J95 = Amor

     K09W01L KC2009 12 27.95839 05 18 44.59 +65 31 04.2                      J95

     K09W01L KC2009 12 27.96223 05 18 43.73 +65 31 08.1          19.0 R      J95

 

     K09W11D  C2009 12 04.01664 04 44 31.87 +33 38 20.6                      J95 = Apollo

     K09W11D  C2009 12 04.02050 04 44 30.10 +33 38 40.4                      J95

     K09W11D  C2009 12 04.02437 04 44 28.34 +33 39 00.6          18.2 R      J95

 

     K09W25V  C2009 12 01.01337522 47 37.19 +60 31 31.1                      J95 = Apollo

     K09W25V  C2009 12 01.01691022 46 29.18 +60 31 52.5                      J95

     K09W25V  C2009 12 01.01931622 45 42.88 +60 32 05.9          14.6 R      J95

 

     K09W52A EC2009 12 01.05017 05 33 27.09 +27 44 24.7                      J95 = Apollo

     K09W52A  C2009 12 01.05308 05 33 32.34 +27 44 20.3          19.2 R      J95

 

     K09WA4Z  C2009 12 03.79271 22 28 41.83 +48 58 54.1                      J95 = Aten

     K09WA4Z  C2009 12 03.80601 22 28 58.33 +48 56 43.9                      J95

     K09WA4Z  C2009 12 03.81797 22 29 13.18 +48 54 46.0          15.5 R      J95

     K09WA4Z  C2009 12 06.75992 23 24 37.38 +40 07 43.5          16.0 R      J95

     K09WA4Z  C2009 12 06.80573 23 25 18.53 +39 58 56.4          16.0 R      J95

     K09WA4Z  C2009 12 06.84885 23 25 57.25 +39 50 34.7          15.9 R      J95

     K09WA4Z  C2009 12 10.79603 00 16 36.50 +27 25 45.9                      J95

     K09WA4Z  C2009 12 10.89301 00 17 31.66 +27 08 21.7                      J95

     K09WA4Z  C2009 12 10.93725 00 17 57.09 +27 00 22.2          16.9 R      J95

 

     K09X00D  C2009 12 07.87129 04 40 48.82 +25 05 22.1                      J95 = Apollo

     K09X00D  C2009 12 07.87554 04 40 48.04 +25 05 02.8                      J95

     K09X00D  C2009 12 07.87981 04 40 47.26 +25 04 43.5          17.0 R      J95

     K09X00D  C2009 12 10.97269 04 31 09.43 +20 47 38.3                      J95

     K09X00D  C2009 12 10.98038 04 31 07.88 +20 46 56.7                      J95

     K09X00D  C2009 12 10.98806 04 31 06.33 +20 46 15.0          17.0 R      J95

 

     K09X00O  C2009 12 10.95275 07 38 34.91 +22 53 40.6                      J95 = Apollo

     K09X00O  C2009 12 10.95853 07 38 35.98 +22 53 39.0                      J95

     K09X00O  C2009 12 10.96429 07 38 37.04 +22 53 38.8          18.6 R      J95

     K09X00O KC2009 12 25.93684 08 56 13.94 +20 01 39.8                      J95

     K09X00O KC2009 12 25.94184 08 56 16.48 +20 01 32.8                      J95

     K09X00O KC2009 12 25.94691 08 56 19.05 +20 01 24.9          18.0 R      J95

 

     K09X00V  C2009 12 10.90816 07 43 50.13 +35 18 33.2          18.5 R      J95 = BR59279 = Apollo

     K09X00V  C2009 12 10.94246 07 43 37.70 +35 18 36.9                      J95

     K09X00V  C2009 12 10.94607 07 43 36.41 +35 18 36.6          18.6 R      J95

     K09X00V KC2009 12 26.87743 06 44 43.77 +33 59 36.2                      J95

     K09X00V KC2009 12 26.88204 06 44 43.10 +33 59 34.9                      J95

     K09X00V KC2009 12 26.88661 06 44 42.46 +33 59 32.7          19.1 R      J95

 

     K09X00X KC2009 12 17.79930 03 52 41.09 +30 07 22.4                      J95 = MBA

     K09X00X KC2009 12 17.81092 03 52 40.52 +30 07 17.8          20.1 R      J95

 

     K09X01Q  C2009 12 10.84728 04 56 37.10 +20 54 24.8          19.6 R      J95 = 9XBC944 = Apollo

     K09X01Q  C2009 12 10.85880 04 56 34.34 +20 53 44.0          20.1 R      J95

     K09X01Q  C2009 12 10.87572 04 56 30.34 +20 52 45.3          20.5 R      J95

 

     K09X02F  C2009 12 12.90492 05 01 52.41 +15 01 03.5                      J95 = BR67918 = Apollo

     K09X02F  C2009 12 12.90779 05 01 51.90 +15 01 07.6                      J95

     K09X02F  C2009 12 12.91065 05 01 51.39 +15 01 10.5                      J95

     K09X02F  C2009 12 12.91476 05 01 50.69 +15 01 16.2          18.7 R      J95

     K09X02F KC2009 12 25.95954 04 25 16.80 +20 02 46.9                      J95

     K09X02F KC2009 12 25.98019 04 25 13.34 +20 03 16.5                      J95

     K09X02F KC2009 12 25.98816 04 25 11.98 +20 03 27.7          19.2 R      J95

 

     K09X02P KC2009 12 13.76632 02 46 24.48 +22 45 56.2                      J95 = Apollo

     K09X02P KC2009 12 13.76819 02 46 25.43 +22 46 49.1                      J95

     K09X02P KC2009 12 13.76997 02 46 26.35 +22 47 39.3          17.8 R      J95

 

     K09X06T KC2009 12 26.00089 07 33 45.53 +15 45 02.7                      J95 = Apollo

     K09X06T KC2009 12 26.00569 07 33 43.63 +15 45 05.3                      J95

     K09X06T KC2009 12 26.01063 07 33 41.69 +15 45 07.5          18.1 R      J95

 

     K09X06Z KC2009 12 17.82179 05 47 22.75 +27 34 35.3                      J95 = Apollo

     K09X06Z KC2009 12 17.82679 05 47 25.75 +27 36 20.1                      J95

     K09X06Z KC2009 12 17.83211 05 47 28.93 +27 38 11.0          18.5 R      J95

     K09X06Z KC2009 12 26.81824 06 52 30.90 +50 39 21.1                      J95

     K09X06Z KC2009 12 26.82858 06 52 33.39 +50 40 04.1                      J95

     K09X06Z KC2009 12 26.83884 06 52 35.82 +50 40 46.4          19.9 R      J95

 

     K09X08F  C2009 12 12.95237 04 39 53.92 +20 53 01.6                      J95 = 9XBF423 = MBA

     K09X08F  C2009 12 12.95600 04 39 53.25 +20 53 08.3                      J95

     K09X08F  C2009 12 12.96027 04 39 52.36 +20 53 18.0          20.4 R      J95

 

     K09Y00F KC2009 12 17.90180 05 51 34.56 +22 41 34.9                      J95 = BR88827 = Aten

     K09Y00F KC2009 12 17.90476 05 51 33.22 +22 41 39.6                      J95

     K09Y00F KC2009 12 17.90982 05 51 30.93 +22 41 47.6          18.8 R      J95

     K09Y00F KC2009 12 25.90247 05 00 06.74 +24 57 40.0                      J95

     K09Y00F KC2009 12 25.91824 05 00 00.83 +24 57 50.6          19.5 R      J95

 

     K09Y00G KC2009 12 19.12565 11 17 38.51 +00 23 41.6                      J95 = Apollo

     K09Y00G KC2009 12 19.12946 11 17 40.06 +00 23 32.0                      J95

     K09Y00G KC2009 12 19.13312 11 17 41.55 +00 23 22.5          18.9 R      J95

 

     K09Y00S KC2009 12 19.91111 09 14 13.24 +63 09 57.3          18.3 R      J95 = Apollo

     K09Y00S IC2009 12 19.91492 09 14 15.15 +63 10 16.6                      J95

     K09Y00S KC2009 12 19.91951 09 14 17.43 +63 10 38.9          18.5 R      J95

 

     K09Y00R KC2009 12 19.90207 04 34 58.54 +22 01 06.9                      J95 = 9Y8B0A0 = Aten

     K09Y00R KC2009 12 19.90449 04 34 54.75 +22 01 09.3                      J95

     K09Y00R KC2009 12 19.90718 04 34 50.67 +22 01 10.2          19.5 R      J95

     K09Y00R KC2009 12 22.86352 03 12 36.42 +21 08 12.5                      J95

     K09Y00R KC2009 12 22.87565 03 12 10.26 +21 07 37.9                      J95

     K09Y00R KC2009 12 22.88105 03 11 58.53 +21 07 20.7          19.7 R      J95

     K09Y00R KC2009 12 25.76576 01 32 47.91 +16 41 12.7          19.9 R      J95

     K09Y00R KC2009 12 25.78176 01 32 11.43 +16 39 11.5          20.2 R      J95

     K09Y00R FC2009 12 25.81832 01 30 48.04 +16 34 30.9          20.1 R      J95

 

     K09Y06U KC2009 12 21.00230 09 14 41.47 +22 57 19.5                      J95 = 9Y8CBFF = Apollo

     K09Y06U KC2009 12 21.01123 09 14 40.39 +22 57 41.9          20.5 R      J95

 

     K09Y06V IC2009 12 20.95114 05 21 01.95 +25 31 44.3                      J95 = 9Y8CF0B = Amor

     K09Y06V KC2009 12 20.97449 05 20 58.72 +25 31 18.0          21.1 R      J95

 

     K09Y18P IC2009 12 26.84765 05 58 56.96 +11 58 04.8                      J95 = SHU050 = Outer Main-belt Asteroid

     K09Y18P KC2009 12 26.85236 05 58 56.62 +11 58 01.5          19.3 R      J95

     K09Y18P KC2009 12 26.85935 05 58 56.12 +11 57 54.0                      J95

 

     GS9CSA  KC2009 12 27.96857 06 56 56.49 +36 14 56.4                      J95 = GS9CSA = probably MBA 2008 UZ90 = Great Shefford ONS

     GS9CSA  KC2009 12 27.97433 06 56 56.14 +36 14 57.2                      J95

     GS9CSA  KC2009 12 27.98011 06 56 55.69 +36 14 59.2          19.5 R      J95

     GS9CSA  KC2009 12 28.00227 06 56 54.23 +36 15 06.4                      J95

 

John Fletcher

 

Hi

Merry Christmas to all.

It is cold outside.

Regards John.

 

Eros No.433 (unusual listing)

Near Earth Asteroids.

No. 159402 / No. 2002 WP / No. 2006 UR

 

COD J93

OBS John Fletcher

MEA John Fletcher

TEL 0.25-m f/5.5 Schmidt-Cassegrain + CCD

ACK MPCReport file updated 2009.12.20 21:23:27

AC2 jfmto@blueyonder.co.uk

NET USNO-A2.0

     K02W00P  C2009 12 20.85001 02 33 02.22 +25 48 07.5          16.4 V      J93

     K02W00P  C2009 12 20.85102 02 33 02.17 +25 48 13.0          16.3 V      J93

     K02W00P  C2009 12 20.85306 02 33 02.02 +25 48 23.9          16.4 V      J93

     K06U00R  C2009 12 20.88003 07 45 09.22 +14 55 52.5          16.0 V      J93

     K06U00R  C2009 12 20.88498 07 45 10.24 +14 55 36.8          16.1 V      J93

     K06U00R  C2009 12 20.88993 07 45 11.27 +14 55 21.6          16.1 V      J93

00433         C2009 12 20.81537 22 56 30.47 +07 11 12.3          13.0 V      J93

00433         C2009 12 20.81769 22 56 30.79 +07 11 14.0          12.9 V      J93

00433         C2009 12 20.82000 22 56 31.07 +07 11 15.1          12.9 V      J93

F9402         C2009 12 20.83869 09 30 06.49 +53 26 56.1          15.1 V      J93

F9402         C2009 12 20.84031 09 30 06.29 +53 26 54.0          15.2 V      J93

F9402         C2009 12 20.84192 09 30 06.07 +53 26 52.6          15.1 V      J93

----- end -----

 

Minus 5°C at 22.00hrs. Telescope tube iced up but customized dew heater doing its job. The Dome was frozen up when opening up as daytime temperatures never went above minus 2°C all day long. Severe frost like needles sticking up on everything.

Best wishes john.

 

Eros. No 433  (unusual listing)

NEO’s

159402

2007 MK13

2005 MC

 

COD J93

OBS John Fletcher

MEA John Fletcher

TEL 0.25-m f/5.5 Schmidt-Cassegrain + CCD

ACK MPCReport file updated 2010.01.04 21:54:10

AC2 jfmto@blueyonder.co.uk

NET CMC-14

     K05M00C  C2010 01 04.89021 08 54 40.34 +08 28 51.7          16.0 V      J93

     K05M00C  C2010 01 04.89364 08 54 39.64 +08 28 39.2          16.1 V      J93

     K05M00C  C2010 01 04.89719 08 54 38.88 +08 28 26.6          16.1 V      J93

00433         C2010 01 04.79836 23 31 23.07 +09 38 28.5          12.9 V      J93

00433         C2010 01 04.80068 23 31 23.40 +09 38 29.6          13.0 V      J93

00433         C2010 01 04.80302 23 31 23.74 +09 38 30.9          13.0 V      J93

F9402         C2010 01 04.81856 08 48 57.16 +48 12 54.4          15.5 V      J93

F9402         C2010 01 04.82369 08 48 56.45 +48 12 48.1          15.5 V      J93

F9402         C2010 01 04.82541 08 48 56.17 +48 12 46.2          15.5 V      J93

NET NOMAD

     K07M13K  C2010 01 04.83543 07 58 14.15 +63 02 27.6          15.7 V      J93

     K07M13K  C2010 01 04.84036 07 58 12.01 +63 03 07.5          15.7 V      J93

     K07M13K  C2010 01 04.84281 07 58 10.89 +63 03 27.4          15.4 V      J93

----- end -----

 

Richard Miles

 

COD F65

OBS R. Miles

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.12 12:51:32

AC2 rmiles@baa.u-net.com

NET CMC-14

     K10A30L  C2010 01 12.48271 07 32 55.47 +09 54 40.2          16.2 R

F65

     K10A30L  C2010 01 12.48321 07 32 54.21 +09 54 42.8          16.1 R

F65

     K10A30L  C2010 01 12.48379 07 32 52.75 +09 54 45.8          16.3 R

F65

     K10A30L  C2010 01 12.48433 07 32 51.36 +09 54 48.7          16.3 R

F65

     K10A30L  C2010 01 12.48486 07 32 50.03 +09 54 51.4          16.3 R

F65

     K10A30L  C2010 01 12.48538 07 32 48.71 +09 54 54.2          16.3 R

F65

     K10A30L  C2010 01 12.48597 07 32 47.22 +09 54 57.2          16.1 R

F65

     K10A30L  C2010 01 12.48657 07 32 45.72 +09 55 00.3          16.2 R

F65

     K10A30L  C2010 01 12.48712 07 32 44.32 +09 55 03.1          16.2 R

F65

     K10A30L  C2010 01 12.48766 07 32 42.95 +09 55 05.9          16.2 R

F65

     K10A30L  C2010 01 12.48820 07 32 41.58 +09 55 08.8          16.3 R

F65

     K10A30L  C2010 01 12.48927 07 32 38.86 +09 55 14.3          16.1 R

F65

     K10A30L  C2010 01 12.48982 07 32 37.42 +09 55 17.2          16.3 R

F65

     K10A30L  C2010 01 12.49036 07 32 36.08 +09 55 19.9          16.3 R

F65

     K10A30L  C2010 01 12.49091 07 32 34.67 +09 55 22.8          16.3 R

F65

     K10A30L  C2010 01 12.49147 07 32 33.27 +09 55 25.6          16.3 R

F65

     K10A30L  C2010 01 12.49202 07 32 31.84 +09 55 28.5          16.1 R

F65

     K10A30L  C2010 01 12.49258 07 32 30.42 +09 55 31.4          16.2 R

F65

     K10A30L  C2010 01 12.49311 07 32 29.08 +09 55 34.1          16.2 R

F65

     K10A30L  C2010 01 12.49365 07 32 27.67 +09 55 37.0          16.2 R

F65

     K10A30L  C2010 01 12.49475 07 32 24.87 +09 55 42.6          16.2 R

F65

     K10A30L  C2010 01 12.49529 07 32 23.47 +09 55 45.5          16.1 R

F65

     K10A30L  C2010 01 12.49582 07 32 22.10 +09 55 48.4          16.2 R

F65

     K10A30L  C2010 01 12.49640 07 32 20.62 +09 55 51.3          16.3 R

F65

     K10A30L  C2010 01 12.49747 07 32 17.88 +09 55 56.7          16.3 R

F65

     K10A30L  C2010 01 12.49801 07 32 16.47 +09 55 59.6          16.1 R

F65

     K10A30L  C2010 01 12.49855 07 32 15.07 +09 56 02.4          16.0 R

F65

----- end -----

 

COD F65

OBS D. Sergison

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.12 12:51:32

AC2 rmiles@baa.u-net.com

NET CMC-14

     K10A30L  C2010 01 12.52573 07 31 03.84 +09 58 23.2          16.1 R

F65

     K10A30L  C2010 01 12.52641 07 31 02.03 +09 58 26.8          16.2 R

F65

     K10A30L  C2010 01 12.52703 07 31 00.37 +09 58 30.0          16.2 R

F65

     K10A30L  C2010 01 12.52763 07 30 58.77 +09 58 33.0          16.2 R

F65

     K10A30L  C2010 01 12.52835 07 30 56.84 +09 58 36.8          16.1 R

F65

     K10A30L  C2010 01 12.52894 07 30 55.26 +09 58 39.9          16.1 R

F65

     K10A30L  C2010 01 12.52953 07 30 53.70 +09 58 42.9          16.2 R

F65

     K10A30L  C2010 01 12.53019 07 30 51.92 +09 58 46.3          16.2 R

F65

     K10A30L  C2010 01 12.53076 07 30 50.39 +09 58 49.3          16.2 R

F65

     K10A30L  C2010 01 12.53252 07 30 45.68 +09 58 58.4          16.0 R

F65

     K10A30L  C2010 01 12.53331 07 30 43.55 +09 59 02.5          16.1 R

F65

     K10A30L  C2010 01 12.53389 07 30 42.02 +09 59 05.5          16.0 R

F65

     K10A30L  C2010 01 12.53451 07 30 40.33 +09 59 08.7          15.9 R

F65

     K10A30L  C2010 01 12.53506 07 30 38.84 +09 59 11.6          15.9 R

F65

     K10A30L  C2010 01 12.53563 07 30 37.32 +09 59 14.5          16.0 R

F65

     K10A30L  C2010 01 12.53622 07 30 35.73 +09 59 17.5          16.0 R

F65

     K10A30L  C2010 01 12.53679 07 30 34.21 +09 59 20.4          16.0 R

F65

     K10A30L  C2010 01 12.53820 07 30 30.40 +09 59 27.8          16.1 R

F65

     K10A30L  C2010 01 12.53877 07 30 28.85 +09 59 30.7          16.1 R

F65

     K10A30L  C2010 01 12.53937 07 30 27.25 +09 59 33.7          16.1 R

F65

     K10A30L  C2010 01 12.53990 07 30 25.80 +09 59 36.6          16.0 R

F65

----- end -----

 

COD E10

OBS R. Miles

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.12 14:50:51

AC2 rmiles@baa.u-net.com

NET CMC-14

     K10A30L  C2010 01 12.57066 07 30 28.13 +10 26 26.0          16.0 R

E10

     K10A30L  C2010 01 12.57219 07 30 23.75 +10 26 38.3          16.3 R

E10

     K10A30L  C2010 01 12.57294 07 30 21.58 +10 26 44.4          16.2 R

E10

     K10A30L  C2010 01 12.57368 07 30 19.45 +10 26 50.5          16.0 R

E10

     K10A30L  C2010 01 12.57440 07 30 17.39 +10 26 56.3          16.1 R

E10

     K10A30L  C2010 01 12.57753 07 30 08.32 +10 27 22.2          16.2 R

E10

     K10A30L  C2010 01 12.57969 07 30 02.01 +10 27 39.8          16.1 R

E10

----- end -----

 

COD F65

OBS R. Miles

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.18 22:27:19

AC2 rmiles@baa.u-net.com

NET USNO-B1.0

     K10A61N  C2010 01 18.40561 08 57 42.55 +21 08 09.1          19.8 V

F65

     K10A61N  C2010 01 18.40623 08 57 42.95 +21 08 15.3          19.7 V

F65

     K10A61N  C2010 01 18.40687 08 57 43.38 +21 08 21.2          19.8 V

F65

     K10A60O  C2010 01 15.64201 10 44 18.35 +34 37 50.0          18.3 V

F65

     K10A60O  C2010 01 15.64267 10 44 17.89 +34 37 48.3          18.5 V

F65

     K10A60O  C2010 01 15.64331 10 44 17.41 +34 37 46.8          18.4 V

F65

     K10A60O  C2010 01 15.64413 10 44 16.79 +34 37 44.8          18.3 V

F65

----- end -----

 

COD F65

OBS R. Miles

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.19 20:18:15

AC2 rmiles@baa.u-net.com

NET CMC-14

     K10A15A  C2010 01 19.39898 06 55 25.68 +27 52 29.0          20.9 R

F65

     K10A15A  C2010 01 19.40229 06 55 25.47 +27 52 28.5          20.8 R

F65

     K10A15A  C2010 01 19.40508 06 55 25.29 +27 52 28.0          20.7 R

F65

     K10A15A  C2010 01 19.40804 06 55 25.10 +27 52 27.6          21.2 R

F65

     K10A15A  C2010 01 19.46134 06 55 21.69 +27 52 18.8          21.1 R

F65

     K10A15A  C2010 01 19.46413 06 55 21.52 +27 52 18.4          21.6 R

F65

     K10A15A  C2010 01 19.46683 06 55 21.35 +27 52 17.9          21.2 R

F65

     K10A15A  C2010 01 19.46991 06 55 21.15 +27 52 17.4          21.1 R

F65

     K10A15A  C2010 01 19.47300 06 55 20.96 +27 52 16.9          21.1 R

F65

     K10A15A  C2010 01 19.51614 06 55 18.23 +27 52 09.7          21.0 R

F65

     K10A15A  C2010 01 19.51822 06 55 18.10 +27 52 09.0          21.1 R

F65

----- end -----

 

COD E10

OBS R. Miles

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.01.22 18:52:02

AC2 rmiles@baa.u-net.com

NET USNO-B1.0

     K10B02K  C2010 01 22.43957 03 54 12.67 -17 05 45.2          17.7 R

E10

     K10B02K  C2010 01 22.44228 03 54 15.79 -17 05 14.4          17.5 R

E10

     K10B02K  C2010 01 22.44398 03 54 17.72 -17 04 55.3          17.9 R

E10

     K10B02K  C2010 01 22.44559 03 54 19.59 -17 04 36.9          17.8 R

E10

     K10B02K  C2010 01 22.44720 03 54 21.40 -17 04 19.0          18.1 R

E10

     K10B02K  C2010 01 22.44879 03 54 23.18 -17 04 01.1          18.2 R

E10

     K10B02K  C2010 01 22.45384 03 54 28.93 -17 03 03.9          17.8 R

E10

     K10B02K  C2010 01 22.45545 03 54 30.79 -17 02 46.1          18.1 R

E10

----- end -----

 

COD F65

COM Stack of 4 images, total integration time = 320 s

OBS A. Debackčre

MEA R. Miles

TEL 2.0-m f/10.0 Ritchey-Chretien + CCD

ACK MPCReport file updated 2010.02.02 16:35:04

AC2 rmiles@baa.u-net.com

NET USNO-B1.0

     K10A15A  C2010 01 22.46034 06 52 28.77 +27 44 00.5          21.2 V

F65

     K10A15A  C2010 01 22.46234 06 52 28.64 +27 44 00.2          22.0 V

F65

     K10A15A  C2010 01 22.46438 06 52 28.52 +27 43 59.7          21.5 V

F65

     K10A15A  C2010 01 22.46649 06 52 28.41 +27 43 59.3          21.4 V

F65

     FRAG001  C2010 01 22.46338 06 52 18.49 +27 42 55.2          23.8 V

F65

----- end -----

 

Images

 

Colleagues,

 

Here attached are two stacked images of these enigmatic objects made 1.5

hours apart in sub-arcsecond seeing using Faulkes.  There appears to be some

evolution in the head of the comet during this time interval.  Note that the

head of the coma appears rather rectilinear or flattened in shape.  The coma

also appears to have moved slightly further away from the asteroid in the

later image.  A shorter-exposure, stacked image taken more than 1 hour later

still, seemed to show further changes in the form of the coma.

 

The asteroid, 2010 AA15 is about V=21.5 and appears to have a slow rotation

rate, probably in excess of 12 hours.  There is no evidence of remanant

cometary activity.  Note that it has a very similar orbit to the comet

according to the MPC and so the two are clearly physically associated.

There is no evidence of fragments at the head of the coma although the

rectilinear feature may be caused by metre-size fragments aligned in some

way and slowly breaking up.

 

Richard Miles

 

Occultations

 

Andrew Elliott

 

ASTEROIDAL OCCULTATION - REPORT FORM

====================================

 

EAON - EUROPEAN ASTEROIDAL OCCULTATION NETWORK

 

1. DATE: 2010 Jan 05   STAR: TYC 1386-01139-1    ASTEROID: (515) Athalia

 

2. OBSERVER Name:  Andrew Elliott         Abbr: ELL

   Address:  White Lodge, Bank Lane, Warton, PRESTON, PR4 1TB, UK

   Tel: +44 (0)1772 632450    Email:  ae@f2s.com

 

3. OBSERVING STATION - Warton Bank Observatory North - fixed single station

   Nearest City:  PRESTON, UK

   Latitude :  53d 44' 25.6"N

   Longitude: 002d 54' 25.4"W

   Height above ellipsoid: 65m (EGM96 Geoid Height = 52.4m)

   Datum WGS 84 - all coordinates GPS averaged 24hrs.

 

4. TIMING OF EVENTS     OCCULTATION RECORDED?  NEGATIVE

   Type of event:

   (S)tart observation  (I)nterrupt start  (D)isappearance (B)link (F)lash

   (E)nd observation    (J)Interrupt end   (R)eappearance  (O)ther (specify)

 

   Event     Time (UTC)     Accuracy

   Code    (HH MM SS.ss)   (+/-S.ss)

   S        22 00 00        (Central predicted time here: ~22:02:04 UT)

   E        22 03 57

 

5. TELESCOPE Type:  Schmidt-Cassegrain     Aperture:  406mm + f/3.3 reducer

             Mount: Altazimuth 'goto'      Motor drive: Yes

   Magnification: Video f.o.v. ~ 15' x 11'

 

6. TIMING AND RECORDING

   Timekeeping: GPS receiver - Garmin 35 HVS, 1pps output into:

   Mode: On-screen display   - BlackBoxCamera 'STVASTRO' GPS video Date/Time

                               inserter.

   Device: VIDEO - Watec 902H2 Ultimate CCIR video camera at Cass. focus.

     Gain Control MANUAL, gain MAX, gamma OFF (1.0), BLC-factory default.

   Recording: Sony DCR-TRV20E DV camcorder tape recording.

   Backup: MSF 60KHz time signal beeps on audio track - synch. confirmed.

 

7. OBSERVING CONDITIONS

   Atmospheric transparency:  Fair   Wind: Nil  Temperature: -4C

   Star image stability    :  Good   Star elevation: +38 degrees

   No scintillation

   Minor Planet visible on video? No  (LM = 13)

 

8. OBSERVATION QUALITY -   Very Good

 

9. ADDITIONAL COMMENTS

   Report submitted to Gilles Regheere and PLANOCCULT only.

   Video clip examined frame-by-frame in VirtualDub (6000 frames!) - star

   present on every frame - NO occultation.

   (Site INSIDE predicted track near N limit.)

 

Best Regards:  Andrew Elliott

Date: 2010 Jan 09

(Rev. Jan 2010)

 

Tim Haymes

 

        ASTEROIDAL OCCULTATION - REPORT FORM

 

    +------------------------------+  +------------------------------+

    |            EAON              |  |            IOTA/ES           |

    |                              |  |   INTERNATIONAL OCULTATION   |

    |     EUROPEAN  ASTEROIDAL     |  |      TIMING  ASSOCIATION     |

    |     OCCULTATION NETWORK      |  |       EUROPEAN SECTION       |

    +------------------------------+  +------------------------------+

 

1 DATE: 2009/12/12  STAR: TYC 5225-01081-1  ASTEROID: [803] Picka

 

2 OBSERVER:  Name  : Tim HAYMES           Abbr: TVH

             E-mail: tvh.observatory@btinternet.com

             Address: Hill Rise, Knowl Hill Common, RG10 9YD UK

 

3 OBSERVING STATION: Nearest city: MAIDENHEAD

  Latitude:  N 51 30 22".0 (OSGB)

  Longitude: W 00 48 52".7 (OSGB)

  Altitude:  75 m

  -

  Single station

 

                         +----------------------------------+

4 TIMING OF EVENTS:      |                                  |

                         |  OCCULTATION RECORDED: NEGATIVE  |

                         |                                  |

                         +----------------------------------+

  Type of event

  Start observation   Interrupt-start   Disappearance   Blink   Flash

  End observation     Jnterrupt-end     Reappearance    Other (specify)

 

                                                    Comments

  Event   Time (UT)    P.E.   Acc.  

  Code   HH MM SS.ss   S.ss   S.ss

 

    S  - 18:29:39    -      -      :

 

    D  -             -      -      :

    R  -             -      -      :

 

    E  - 18:35:40    -      -      :

 

                          Duration :

                         Mid-event :

 

5 TELESCOPE: Type: NEWTONIAN   Aperture: 300mm F/4

             Magnification: prime focus

             Mount:EQUATORIAL          Motor drive: YES

 

6 TIMING & RECORDING:

  Time source: BT telephone

  Sensor: Watec 120N+  2/25th integration

  Recording: Sony TRV22E

    Time insertion: Video Time Inserter

 

7 OBSERVING CONDITIONS:

  Atmospheric transparency: GOOD   Wind: NO  Temperature: 6 C

  Star image stability: FAIR       Minor planet visible: NO

 

8 ADDITIONAL COMMENTS:

  23 miles north of the predicted centerline (S. Preston).

  Photometric frame analysis performed (Limovie / AviSynth)

  Clear sky.

 

ASTEROIDAL OCCULTATION - REPORT FORM

 

    +------------------------------+  +------------------------------+

    |            EAON              |  |            IOTA/ES           |

    |                              |  |   INTERNATIONAL OCULTATION   |

    |     EUROPEAN  ASTEROIDAL     |  |      TIMING  ASSOCIATION     |

    |     OCCULTATION NETWORK      |  |       EUROPEAN SECTION       |

    +------------------------------+  +------------------------------+

 

1 DATE: 2009/12/20  STAR: 3UC208-01948  ASTEROID: [1881] Shao

 

2 OBSERVER:  Name  : Tim V.HAYMES           Abbr: TVH

             E-mail: tvh.observatory@btinternet.com

             Address: Hill Rise, Knowl Hill Common, RG10 9YD, UK

 

3 OBSERVING STATION: Nearest city: MAIDENHEAD

  Latitude:  N 51 30 22".0 (OSGB)

  Longitude: W 00 48 52".7 (OSGB)

  Altitude:  75 m

  -

  Single station

 

                         +----------------------------------+

4 TIMING OF EVENTS:      |                                  |

                         |  OCCULTATION RECORDED: NEGATIVE  |

                         |                                  |

                         +----------------------------------+

  Type of event

  Start observation   Interrupt-start   Disappearance   Blink   Flash

  End observation     Jnterrupt-end     Reappearance    Other (specify)

 

                                                    Comments

  Event   Time (UT)    P.E.   Acc.  

  Code   HH MM SS.ss   S.ss   S.ss

 

    S  - 22:26:00    -      -      :

 

    D  -             -      -      :

    R  -             -      -      :

 

    E  - 22:41:00    -      -      :

 

                          Duration :

                         Mid-event :

 

5 TELESCOPE: Type: NEWTONIAN   Aperture: 300mm F/4

             Magnification: prime focus

             Mount:EQUATORIAL          Motor drive: YES

 

6 TIMING & RECORDING:

  Time source: MSF Anthorn

  Sensor: Watec 120N+  2/25th integration

  Recording: Sony TRV22E

    Time insertion: Video Time Inserter

 

7 OBSERVING CONDITIONS:

  Atmospheric transparency: GOOD   Wind: NO  Temperature: -3 C

  Star image stability: FAIR       Minor planet visible: NO

 

8 ADDITIONAL COMMENTS:

  North of the predicted centerline in the 1 sigma zone

  Photometric frame analysis performed (Limovie / AviSynth)

  Icy conditions. Difficulty opening the observatory door.

 

                   ASTEROIDAL OCCULTATION - REPORT FORM

 

    +------------------------------+  +------------------------------+

    |            EAON              |  |            IOTA/ES           |

    |                              |  |   INTERNATIONAL OCULTATION   |

    |     EUROPEAN  ASTEROIDAL     |  |      TIMING  ASSOCIATION     |

    |     OCCULTATION NETWORK      |  |       EUROPEAN SECTION       |

    +------------------------------+  +------------------------------+

 

1 DATE: 2009/12/25  STAR: 2UCAC 46394040  ASTEROID: [134] Sophrosyne

 

2 OBSERVER:  Name  : Tim V.HAYMES           Abbr: TVH

             E-mail: tvh.observatory@btinternet.com

             Address: Hill Rise, Knowl Hill Common, RG10 9YD, UK

 

3 OBSERVING STATION: Nearest city: MAIDENHEAD

  Latitude:  N 51 30 22".0 (OSGB)

  Longitude: W 00 48 52".7 (OSGB)

  Altitude:  75 m

  -

  Single station

 

                         +--------------------------------------+

4 TIMING OF EVENTS:      |                                      |

                         |  OCCULTATION RECORDED: INCONCLUSIVE  |

                         |                                      |

                         +--------------------------------------+

  Type of event

  Start observation   Interrupt-start   Disappearance   Blink   Flash

  End observation     Jnterrupt-end     Reappearance    Other (specify)

 

                                                    Comments

  Event   Time (UT)    P.E.   Acc.  

  Code   HH MM SS.ss   S.ss   S.ss

 

    S  - 23:11:00    -      -      :

 

    D  -             -      -      :

    R  -             -      -      :

 

    E  - 23:25:00    -      -      :  Interupted by cloud and dew

 

                          Duration :

                         Mid-event :

 

5 TELESCOPE: Type: NEWTONIAN   Aperture: 300 mm

             Magnification:    prime focus F/4

             Mount: EQUATORIAL          Motor drive: YES

 

6 TIMING & RECORDING:

  Time source:   MSF Anthorn 60 KHz

  Sensor: Watec 120N integrating video camera.

  Recording: Sony TRV33E  DV camcorder

    Time insertion: Video time inserter (Manual synchronisation to UT)

 

7 OBSERVING CONDITIONS:

  Atmospheric transparency: GOOD   Wind: NO  Temperature: -1 rising to +2 C

  Star image stability: FAIR       Minor planet visible: YES

 

8 ADDITIONAL COMMENTS:

  In the track. Photometric frame analysis performed. Very poor recording.

  Unknown at the time, but heavy dew on the optical surfaces required a

  integration setting 6 (32/25th sec integration !!).

  An observation made more difficult by the small 0.3mag drop

  Result: INCONCLUSIVE

 

Project NeilBone (coordinated by Richard Miles)

 

2009 Dec 14

 

Please find attached a spreadsheet showing our target list and a summary of

progress.  Note that some of the original targets have been now discounted

mainly because they do not attain a low-enough phase angle but also if in

close proximity to the bright Moon when at opposition.

 

We missed coverage of (770) Bali at opposition but have been successful with

7 other target bodies to date - so 7 out of 8 is a pretty good success rate.

The latest was (1645) Waterfield for which we have images virtually at

opposition, some using the Tzec Maun robotic telescope facility (thanks to

Darryl Sergison), and some taken during a live observing session on the

Faulkes Telescope South during last Saturday's BAA Christmas Meeting.  I am

also pleased to say that for our project's namesake, (7102) Neilbone we

already have 5 observing runs in the bag with more planned - opposition is

on Jan 18.

 

Our next target passing through opposition is (581) Tauntonia on Jan 4.

Current targets are shown in green on the spreadsheet.  Please make those

objects close to opposition your priority so this is in order:  (1645),

(121) and (581).

 

Thanks,

Richard

 

Project NeilBone:

 

 

 

 

 

 

 

 

 

 

 

 

List B - updated 2009 Dec 14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW PHASE ANGLE TARGETS

 

 

 

 

 

 

 

 

 

 

 

 

 

Opposition

 

Rotational

Observed

Notes

 

Asteroid

Asteroid

Asteroid

Opposition

Minimum

Min. Observed

V

 

 

Lightcurve

Observed

Lightcurve

 

Number

Name

Type

Date

Phase Angle

Phase Angle

Mag

Dec.

Period

Amplitude

Period

Amplitude

 

 

 

 

 

m   d

deg

deg

 

 

h

mag

 

mag

 

 

 

 

 

2009

 

 

 

 

 

 

 

 

 

 

150

Nuwa

Cb

10 23.8

0.08

0.10

11.5

+11

8.14

0.09

8.134

0.15

 

 

1130

Skuld

S

10 24.9

0.18

0.19

13.5

+12

4.81

0.5

4.806

0.26

 

 

384

Burdigala

S

11 08.7

0.13

0.17

12.1

+16

17

0.03

400

0.32

on-going

 

770

Bali

S

11 10.2

0.27

0.82

12.2

+18

5.951

0.40-0.55

 

 

missed coverage close to opposition

 

138

Tolosa

S

11 15.1

0.08

0.08

11.5

+18

10.101

0.4

 

 

on-going

 

1423

Jose

S

11 20.1

0.02

0.02

13.8

+20

12.307

0.68-0.82

 

 

on-going

 

121

Hermione

Ch

12 08.1

0.17

0.17

11.6

+23

5.551

0.04-0.45

 

 

on-going

 

1645

Waterfield

XDC

12 12.5

0.06

0.06

14.5

+23

4.861

0.2

 

 

on-going

 

171

Ophelia

C

12 16.6

0.35

not a target

12.2

+22

6.665

0.14-0.45

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2010

 

 

 

 

 

 

 

 

 

 

581

Tauntonia

Xk

01 04.2

0.18

 

13.8

+23

16.54

0.06

 

 

on-going

 

702

Alauda

B

01 08.8

0.28

not a target

11.7

+23

8.36

0.1

 

 

 

 

7102

Neilbone

?

01 18.3

0.03

 

17.5

+21

?

?

 

 

on-going

 

484

Pittsburghia

S

01 27.3

0.02

 

13.5

+18

10.63

0.37

 

 

on-going

 

625

Xenia

Sa

01 28.8

0.09

not a target

14.3

+18

21.101

0.5

 

 

too faint and near Moon when at opposition

64

Angelina

Xe

01 29.6

0.003

 

10.2

+18

8.752

0.42

 

 

on going - near full Moon at opposition

59

Elpis

B

03 13.3

0.18

 

11.9

+3

13.69

0.2

 

 

 

 

996

Hilaritas

B

03 15.8

0.05

 

14.3

+2

7.2

0.69

 

 

 

 

1451

Grano

S

03 17.2

0.08

 

14.2

+2

5.109

0.06

 

 

 

 

658

Asteria

S

03 23.9

0.16

 

14.4

-2

21.034

0.32

 

 

 

 

495

Eulalia

S

03 25.0

0.06

 

14.2

-2

29.2

0.3

 

 

 

 

73

Klytia

S

03 29.9

0.04

 

12.4

-4

8.297

0.35

 

 

 

 

1225

Ariane

S

03 31.2

0.10

 

14.2

-4

5.507

0.36

 

 

 

 

 

2009 Dec 16

 

Dear All,

 

I have now analysed all images, etc. of (384) Burdigala.  Attached are the

latest results.  With Alessandro's latest datapoint from last night obtained

using the Bradford Robotic Telescope, it turns out that the object turns

somewhat more slowly than I first thought and has a rotation period close to

17.1 days (410+/-4 hr).  The lightcurve amplitude is 0.34 +/- 0.03 mag.

 

These findings make this object the 13th slowest known rotator in the Solar

System excluding our Sun and Moon - that's out of more than 3800 such

objects.  There are some 830 asteroids which are intrinsically brighter than

H=10 for which we have an estimate of their rotation period - amazingly

(384) Burdigala is the slowest known rotator in this category!  So quite

some discovery.

 

Doing phase angle studies in this way is a powerful method for detecting

anomalous or unusual characteristics of asteroids.  It is possible to

discover a binary asteroid doing this type of investigation.  At present we

are in the very early stages of the project so no doubt there will be more

surprises to come.

 

Note that although (384) is supposedly of a very similar class of object to

that of (1130) Skuld, its phase curve fits a relatively shallow linear

section having a coefficient of about 0.032 mag/deg in contrast to (1130)

for which the main linear portion has a coefficient close to 0.050 mag/deg.

(384) Burdigala also exhibits a more intense opposition effect amounting to

about 0.33 magnitudes.

 

Richard

 

 

2009 December 29

 

Dear Fellow Observer,

 

Here are the provisional plots of the results for asteroid (770) Bali.  We

were unable to follow this one through opposition but have obtained an

accurate phase curve down to about 0.5 deg PhA - so not bad at all.  The

official rotation period for this object on the MPC/JPL database is 5.951

hours but it became clear after trying to fit the first 6-8 observing runs

that this period was incorrect.  A period of 5.8202+/-0.0010 hr fits the

data uniquely, the object exhibiting a lightcurve amplitude of 0.29 +/-0.02

mag at this apparition.

 

Searching the Web, I found observations from 2007 and from 2009 which also

found a period of about 5.819 hr.  See: http://www2.ocn.ne.jp/~hamaten/00770bali-lc.htm

http://obswww.unige.ch/~behrend/page3cou.html#000770

 

The phase curve shown here has been normalised relative to a linear phase

coefficient of 0.030 mag/deg.  From the slope of the linear plot between

PhAs of 7-23 deg, it is clear that the linear section has a slope lower than

this, probably around 0.026 mag/deg.

 

Now that we have results on 4 objects, it will be worth starting to compare

the measured phase curves with theoretical ones based on the H,G magnitude

system, seeing how different values for the Slope Parameter, G, match our

results.

 

One other news item - some of us are using the Tzec Maun remote observing

facilities for the project.  I have submitted a report on our activities to

the Tzec Maun foundation.  The report can be accessed at: http://blog.tzecmaun.org/?p=562

 

Happy 2010,

Richard

 

P.S.  Please use my alternative email address as I am having trouble with my

btinternet one.  It is:

rmiles@baa.u-net.com

 

 

2010 Jan 2

 

Just a quick reminder that (581) Tauntonia reaches opposition on the night

of January 3/4 and so this is the main priority target for observation over

the next week.  I managed to image it last night when 15 degrees from the

98% illuminated Moon and obtained a good result thanks to the crystal clear

sky.  So we are now poised to obtain good coverage as the Moon is waning and

moving further and further away from this asteroid, which by the way is an

Xk type so rather unusual in nature.

 

Richard

 

2010 Jan 19

 

Dear Section Member,

 

Last October, I set up a special BAA project in honour of our late Meteor

Section director, Neil Bone, who sadly died from cancer last April at the

early age of 49.  Some weeks before he died, Neil learned that asteroid 1936

NB had been named after him as an acknowledgement of all that he had done in

furthering amateur astronomy and popularising the subject amongst the

public.  It turned out (and I was able to explain this to Neil in person)

that 'his' object has an unusual orbit which might be indicative of it once

having been a comet.  I also pointed out to Neil that 'his' asteroid would

also pass through an extremely low phase angle (i.e. Sun-Asteroid-Earth

angle) of 0.03 degrees when at opposition this month.  Such events are very

rare, and open up the possibility of measuring the light-scattering

properties of the surface regolith on the body by measuring the extent to

which objects brighten and fade as they approach and recede from opposition

.  A cometary body is very unlikely to exhibit a significant extra

brightening at opposition (see Postscript).

 

I told Neil that we would be starting this project to observe not only 'his'

asteroid but also any other bright asteroid that attained a very low phase

angle at opposition - it was the excuse that I had been looking for for

several years now, I said.  In all, we have 14 members participating in the

observing programme and we have been following 12 asteroids of which (7102)

Neilbone is the latest of nine objects to reach opposition.  This special

event occurred yesterday (Jan 18) and it was in effect a once-in-a-lifetime

opportunity provided the skies were clear since (7102) is unlikely to reach

very low phase angle again for many decades.  Fortunately, I can now report

that using the Faulkes telescopes, we have been successful in observing the

project's namesake asteroid at opposition under very good skies even though

it was only 17th magnitude: thanks to the advantage of using the 2.0 metres

of telescope aperture which Faulkes provides.  So far, Darryl Sergison and I

have used Faulkes telescopes to observe (7102) on 18 nights.  We shall now

follow (7102) from time to time over the next couple of months to watch how

it fades.

 

If you would like to participate by operating one of the Faulkes telescopes

to follow Neil's asteroid then do let me know.  There will also be a lot of

deskwork to reduce the many images that we have acquired, so volunteers here

would be also appreciated.  N.B. On September 25, we are having an

Observers' Workshop at Burlington House and my objective will be to show the

various tricks of the trade in using the latest re-incarnation of the

software, Astrometrica for accurate astrometry/photometry of asteroids and

comets.  The results of Project NeilBone will be used as some of the worked

examples.  Jon Shanklin and John Mason will also be participating as section

directors for the Comet and Meteor Section respectively.  I think it would

be a good idea to then follow up the BAA workshop a few months later with a

dedicated ARPS Workshop to further encourage interest in these subjects.

Watch this space.

 

Clear and tranquil skies,

 

Richard Miles

Director, Asteroids and Remote Planets Section, BAA

 

Postscript:  Comets are very dark and their surfaces are normally composed

of extremely fine particles or dust.  Such surfaces suppress the

re-reflection of sunlight limiting the amount of multiple light scattering

taking place.  This means that little or no extra enhancement occurs as the

objects pass close to zero phase angle.  Asteroids which have a rocky

surface usually show a 20-30% boost in brightness under these

circumstances - it's often referred to as the "Opposition Effect'.

 

2010 Jan 24

 

Colleagues,

 

Please find attached the results for (770) Bali, an average S-type asteroid.

Unfortunately we missed catching it very close to opposition but our results

are nonetheless very satisfying.  You will see that I am attaching the

zipped Excel spreadsheet that has been developed to analyse our

observational data.  There are two Excel versions included, the Excel

97-2003 'steam-driven' one and the latest version.  The spreadsheet now

includes two additional sheets compared to earlier versions.  One is for the

final phase curve, the other is for notes and a summary of the findings re.

the main parameters.

 

As mentioned in Update No.11, our period does not agree with that given in

the Harris/Warner rotation period database used by the MPC and JPL.  There

they give 5.9513 hr and amplitude 0.4 mag with a confidence parameter of 3.

However, I mentioned previously some recent literature references which

agree with our value:

5.8190 hr   http://www2.ocn.ne.jp/~hamaten/00770bali-lc.htm

5.8194 hr   http://obswww.unige.ch/~behrend/page3cou.html#000770

 

In summary:

 

Derived Parameters (this work):

Name:   (770) Bali

Epoch:   2009 Oct - 2010 Jan

PhA Range (deg):   0.49 - 26.26

Period (hr):   5.8205 +/-0.0010

Amplitude (mag):   0.29 +/-0.015

V(1,1,0) magnitude:   11.39 +/-0.02

Phase Coeff. (mag/deg):   0.0443 +/-0.0013

Opp. Surge at PhA=0.4 deg (mag):   0.29 +/-0.02

Opp. Surge at PhA=1.0 deg (mag):   0.21 +/-0.02

 

Few observations were made of this object using robotic telescopes - usually

we manage to double the number of observing runs by use of robotic

telescopes, so overall a good result nonetheless.  I have attached a copy of

the composite lightcurve fyi.

 

Cheers,

Richard

 

2010 Jan 24

 

Dear Observer,

 

A short note to mobilise the troops for coverage of these two asteroids over

the next 7 days!

 

We have (484) Pittsburghia reaching a tiny PHA of 0.02 degrees on Wednesday,

January 27 at 0700 UT, and (64) Angelina attaining a miniscule 0.003 degrees

on Friday, January 29 at 1420UT.  Unfortunately the bright, almost full Moon

will interfere with both of these more especially with the (64) Angelina one

when the 99% illuminated Moon will be less than 10 degrees away from the

target asteroid, so it will be quite a battle.  At least (64) will be very

bright itself at V=10.2 or even a little brighter than this.  Also, all of

the robotic telescopes are not operating because of the full Moon (Faulkes

does not go any closer than 15 degrees to the Moon.  I am going to try and

plead with Tzec Maun to operate their Australian observatory that night.

The TOA-150 refractor would be ideal to try this.  UK-based observers should

try and observe (64) say about 2-3 hours after sunset on that Friday.

 

One other thing.  I have reduced all the data for (138) Tolosa but there is

something slightly odd with the result.  We therefore need to resume

observations of this for the next 7-10 days.

 

Clear Skies,

Richard

 

Index to observations received from ARPS members

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