Index to observations
received from ARPS members
2004 XP14
The following reports were received up to
ASTROMETRY
David
Briggs, J69
COD
J69
OBS
David Briggs
MEA
David Briggs
TEL
0.40-m f/4.57 Newtonian reflector + CCD
ACK MPCReport
file updated 2006.07.04 15:41:51
AC2
NET
USNO-A2.0
K04X14P
C2006 07 03.98902 18 13 18.04 +63 28 39.1 12.0 V J69
K04X14P
C2006 07 03.98921 18 13 16.17 +63 28 27.4 12.0 V J69
K04X14P
C2006 07 03.98995 18 13 09.46 +63 27 42.8 12.4 V J69
K04X14P
C2006 07 03.99219 18 12 49.39 +63 25 30.0 12.3 V J69
K04X14P
C2006 07 03.99294 18 12 42.81 +63 24 46.2 12.4 V J69
K04X14P
C2006 07 03.99593 18 12 16.23 +63 21 48.6 12.2 V J69
K04X14P
C2006 07 03.99667 18 12 09.68 +63 21 04.4 12.4 V J69
K04X14P
C2006 07 03.99742 18 12 03.13 +63 20 20.4 12.2 V J69
K04X14P
C2006 07 03.99816 18 11 56.62 +63 19 36.7 12.0 V J69
Second report from David Briggs
COD
J69
OBS
David Briggs
MEA
David Briggs
TEL
0.40-m f/4.57 Newtonian reflector + CCD
ACK
MPCReport file updated 2006.07.08 00:
AC2
NET USNO-A2.0
K04X14P
C2006 07 07.95679 17 03 06.54 +50 07 47.7 15.8 V J69
K04X14P
C2006 07 07.96030 17 03 05.86 +50 07 39.4 16.0 V J69
K04X14P
C2006 07 07.96380 17 03 05.14 +50 07 30.8 15.9 V J69
COD
940
OBS
R. Dymock
MEA
R. Dymock
TEL
0.25-m f/6.4 reflector + CCD
ACK
MPCReport file updated 2006.07.05 09:32:57
AC2
[roger.dymock@ntlworld.com]
NET
USNO-B1.0
K04X14P
C2006 07 03.89486 18 30 04.08 +65 07 40.9 940
K04X14P
C2006 07 03.90089 18 28 49.72 +65 01 03.5 940
Excuses, excuses. I use a GPS receiver to keep my laptop's clock accurate. Unfortunately in this instance it did not! The clock freezes when the image is being downloaded from the MX516 CCD camera. The GPS normally resets the clock after download is complete during the delay I set between images. In this instance I was imaging continuously and thus there was no time for the clock to be reset. As I was imaging in small batches I did get a couple of measurements from the start of each batch when the clock was correct.
Richard
Miles, J77
First report
Have just sent the following
astrometry/photometry to the MPC. It will be interesting to see how the
residuals turn out given the relatively small size of the refractor. I should
add that I am expecting about 0.5 arcsec residuals or better. I have an
independent set of 55 astrometric positions with my main 0.28-m scope. Will
have a look and see how the two sets compare. I propose to pick out 7 from
these 55 and send them to the MPC.
COD
J77
>>
OBS R. Miles
>>
MEA R. Miles
>>
TEL 0.06-m f/5.9 Refractor + CCD + V filter
>>
ACK MPCReport file updated 2006.07.07 11:
>>
AC2 rmiles.btee@btinternet.com
>>
NET USNO-B1.0
>>
K04X14P C2006 07 04.96487 17 22
21.289+55 06 25.44 13.68V J77
>>
K04X14P C2006 07 04.96988 17 22
14.432+55 05 07.25 13.64V J77
>>
K04X14P C2006 07 04.97624 17 22
05.813+55 03 27.68 13.76V J77
>>
K04X14P C2006 07 04.98696 17 21 51.391+55
00 40.76 13.76V J77
>>
K04X14P C2006 07 04.99197 17 21
44.748+54 59 23.40 13.76V J77
>>
K04X14P C2006 07 04.99697 17 21
38.198+54 58 05.58 13.84V J77
>>
K04X14P C2006 07 05.00198 17 21
31.678+54 56 48.66 13.78V J77
Second report
COD
J77
OBS
R. Miles
MEA
R. Miles
TEL
0.28-m f/10 Schmidt-Cassegrain + CCD
ACK
MPCReport file updated 2006.07.07 11:
AC2
rmiles.btee@btinternet.com
NET
USNO-B1.0
K04X14P
C2006 07 04.96252 17 22 24.54 +55 07 02.5 13.7 V
J77
K04X14P
C2006 07 04.96700 17 22 18.39 +55 05 52.4 13.7 V
J77
K04X14P
C2006 07 04.97396 17 22 08.87 +55 04 03.5 13.8 V
J77
K04X14P
C2006 07 04.98640 17 21 52.15 +55 00 49.6 13.9 V
J77
K04X14P
C2006 07 04.99175 17 21 45.05 +54 59 26.7 13.8 V
J77
K04X14P
C2006 07 04.99712 17 21 38.00 +54 58 03.7 13.7 V
J77
K04X14P
C2006 07 05.00339 17 21 29.83 +54 56 26.9 14.0 V
J77
K04X14P
C2006 07 05.01113 17 21 19.88 +54 54 27.7 14.0 V
J77
K04X14P
C2006 07 05.01560 17 21 14.19 +54 53 19.1 13.8 V
J77
Third report
COD
J77
OBS
R. Miles
MEA
R. Miles
TEL
0.28-m f/10 Schmidt-Cassegrain + CCD
ACK
MPCReport file updated 2006.07.12 13:30:38
AC2 rmiles.btee@btinternet.com
NET
USNO-B1.0
K04X14P
C2006 07 09.92199 17 00 17.61 +49 12 51.6 16.3 V
J77
K04X14P
C2006 07 09.93117 17 00 16.59 +49 12 40.2 16.3 V
J77
K04X14P
C2006 07 09.93966 17 00 15.67 +49 12 29.5 16.7 V
J77
K04X14P
C2006 07 09.94936 17 00 14.59 +49 12 17.1 15.9 V
J77
K04X14P
C2006 07 09.96017 17 00 13.40 +49 12 03.0 16.3 V
J77
K04X14P
C2006 07 11.92089 16 58 50.94 +48 40 36.6 17.0 V
J77
K04X14P
C2006 07 11.92971 16 58 50.31 +48 40 29.4 17.0 V
J77
K04X14P
C2006 07 11.93852 16 58 49.69 +48 40 22.2 17.0 V
J77
K04X14P
C2006 07 11.95083 16 58 48.84 +48 40 11.9 16.9 V
J77
K04X14P
C2006 07 11.95857 16 58 48.30 +48 40 05.3 16.9 V
J77
K04X14P
C2006 07 11.96983 16 58 47.52 +48 39 55.6 17.0 V
J77
K04X14P
C2006 07 11.98104 16 58 46.77 +48 39 45.6 17.1 V
J77
K04X14P
C2006 07 11.99206 16 58 46.04 +48 39 35.6 17.1 V
J77
K04X14P
C2006 07 12.09765 16 58 40.20 +48 37 52.2 16.8 V
J77
Final report
Like many observers world-wide, I observed the
asteroid, 2004 XP14, which made a very close approach to the Earth in July
passing by at about the Moon's distance.
I carried out time-series imaging on 4 nights using an SXV-H9 camera to
obtain photometry and astrometry as the object receded during the 10 days
following closest approach. I now have
all the returns for my astrometry of 2004 XP14 from the Minor Planet Center and
NeoDys. The results based on an
observing arc covering 2 oppositions (comprising 675
observations (MPC) and 680 observations
(NeoDys)) are summarised below.
The
first set of data were obtained using a 60mm aperture Takahashi refractor plus
V filter. For the remainder, I used a
280mm Schmidt-Cassegrain unfiltered.
Each astrometric measure was based on tracking and stacking in
Astrometrica. For the first observing
run when the asteroid was relatively bright and fast moving (14 arcsec/min), I
used 10 x 6sec images for the 280mm, and 20 x 20sec images with the 60mm. For the
280mm data on that first night, I carried out
55 astrometric measures in total to which I fitted a quadratic in RA and in
Dec. I then selected the positions to
submit to the MPC such that they were fairly evenly spread in time along the
observing arc and such that the residuals from the best-fit parabola were
relatively small. The end result appears
to be an improvement in overall precision although there does appear to be a
bias of a few tenths
of an arcsec present. The exercise also demonstrates that precision
astrometry is possible using a small refractor provided the target is
relatively bright (say V<14).
60mm
f/5.9 Refractor + V filter
<------ NeoDys residuals
------> MPC residuals
Date V Mag delta
RA Dec Chi
RA Dec
2006/07/04.96487 13.7 V -0.24 -0.242 -0.324 0.40
0.3- 0.3-
2006/07/04.96988 13.6 V -0.35
-0.181 -0.024 0.18 0.2- 0.0
2006/07/04.97624 13.8 V -0.15
0.031 -0.324 0.33 0.0
0.3-
2006/07/04.98696 13.8 V -0.16
-0.290 -0.430 0.52 0.3- 0.5-
2006/07/04.99197 13.8 V -0.17
-0.297 -0.130 0.32 0.3- 0.1-
2006/07/04.99697 13.8 V -0.17
-0.100 -0.547 0.56 0.1- 0.6-
2006/07/05.00198 13.8 V -0.18
0.004 -0.072 0.03 0.0
0.1-
280mm
f/10 Schmidt-Cass
<------
NeoDys residuals ------> MPC
residuals
Date V Mag delta
RA Dec Chi
RA Dec
2006/07/04.96252 13.7 V -0.24 -0.142
-0.053 0.15 0.2- 0.1-
2006/07/04.96700 13.7 V -0.24 -0.021
0.027 0.03 0.0
0.0
2006/07/04.97396 13.8 V -0.15 -0.223 -0.093
0.24 0.2- 0.1-
2006/07/04.98640 13.9 V -0.06 -0.165 -0.325
0.36 0.2- 0.3-
2006/07/04.99175 13.8 V -0.17 -0.214 -0.239
0.32 0.2- 0.3-
2006/07/04.99712 13.7 V -0.27 -0.131 -0.128
0.18 0.2- 0.2-
2006/07/05.00339 14.0 V 0.02
-0.180 -0.125 0.22 0.2- 0.1-
2006/07/05.01113 14.0 V 0.01
-0.092 -0.187 0.21 0.1- 0.2-
2006/07/05.01560 13.8 V -0.19 -0.074 -0.166
0.18 0.1- 0.2-
2006/07/09.92199 16.3 V -0.34 0.029
0.079 0.09 0.0
0.1+
2006/07/09.93117 16.3 V -0.34 0.068
0.089 0.11 0.1+ 0.1+
2006/07/09.93966 16.7 V 0.05
0.283 0.101 0.30
0.3+ 0.1+
2006/07/09.94936 15.9 V -0.75 0.171
0.125 0.21 0.2+ 0.1+
2006/07/09.96017 16.3 V -0.35 0.065
0.100 0.12 0.1+ 0.1+
2006/07/11.92089 17.0 V -0.18 -0.020
0.154 0.16 0.0
0.2+
2006/07/11.92971 17.0 V -0.19 -0.027
0.056 0.06 0.0
0.1+
2006/07/11.93852 17.0 V -0.19 0.019
0.084 0.09 0.0
0.1+
2006/07/11.95083 16.9 V -0.29 0.159
0.104 0.19 0.2+ 0.1+
2006/07/11.95857 16.9 V -0.29 0.130
0.123 0.18 0.1+ 0.1+
2006/07/11.96983 17.0 V -0.20 0.040
0.226 0.23 0.0
0.2+
2006/07/11.98104 17.1 V -0.10 0.074
0.186 0.20 0.1+ 0.2+
2006/07/11.99206 17.1 V -0.10 0.025
0.164 0.17 0.0
0.2+
2006/07/12.09765 16.8 V -0.43 0.065 -0.175
0.19 0.1+ 0.2-
2006/07/13.92681 17.7 V 0.08
0.139 0.014 0.14
0.1+ 0.0
2006/07/13.93600 17.7 V 0.08
-0.147 0.121 0.19
0.2- 0.1+
2006/07/13.94518 17.6 V -0.02 -0.184
0.042 0.19 0.2- 0.0
2006/07/13.95437 18.1 V 0.48
-0.071 0.287 0.30
0.1- 0.3+
2006/07/13.99709 18.0 V 0.37
0.061 0.228 0.24
0.1+ 0.2+
COD J68
CON D. A. Miller, Tweenhills Observatory, 2 Tweenhills
Cottage, Hartpury, Glos GL19 3BG [minor.planets@dmiller.demon.co.uk]
OBS D. A. Miller
MEA D. A.
Miller
TEL 0.30-m
Schmidt-Cassegrain + CCD + f/3.3 focal reducer
ACK MPCReport
file updated 2006.07.05 18:01:32
AC2
minor.planets@dmiller.demon.co.uk
NET USNO-B1.0
K04X14P C2006 07 04.98854 17 21 49.43 +55 00
08.4 13.7
V J68
K04X14P C2006 07 04.99221 17 21 44.60 +54 59
11.9 13.6
V J68
K04X14P C2006 07 04.99587 17 21 39.84 +54 58
15.3 13.6
V J68
COD J68
CON D. A.
Miller, Tweenhills Observatory, 2 Tweenhills Cottage, Hartpury, Glos GL19 3BG
[minor.planets@dmiller.demon.co.uk]
OBS D. A. Miller
MEA D. A.
Miller
TEL 0.30-m
Schmidt-Cassegrain + CCD + f/3.3 focal reducer
ACK MPCReport
file updated 2006.07.07 03:03:38
AC2
minor.planets@dmiller.demon.co.uk
NET USNO-B1.0
K04X14P C2006 07 04.98492 17 21 54.37 +55 01
05.2 13.9
V J68
K04X14P C2006 07 05.00613 17 21 26.49 +54 55 37.0
13.6 V J68
K04X14P C2006 07 05.01345 17 21 17.20 +54 53
44.3 13.6
V J68
COD J68
CON D. A.
Miller, Tweenhills Observatory, 2 Tweenhills Cottage, Hartpury, Glos GL19 3BG
[minor.planets@dmiller.demon.co.uk]
OBS D. A. Miller
MEA D. A.
Miller
TEL 0.30-m
Schmidt-Cassegrain + CCD + f/3.3 focal reducer
ACK MPCReport
file updated 2006.07.10 18:40:00
AC2
minor.planets@dmiller.demon.co.uk
NET USNO-B1.0
K04X14P C2006 07 10.02541 17 00 06.76 +49 10
31.4 16.2 V
J68
K04X14P C2006 07 10.02949 17 00 06.35 +49 10
25.4 16.8
V J68
K04X14P C2006 07 10.03549 17 00 05.82 +49 10
17.1 16.4
V J68
PHOTOMETRY
Richard
Miles
Photometric analysis of the first night's run
is complete as per the attached plot. My
information to date is that radar studies indicate that it is a slow rotator
with a period of at least 30 hours and so determining an accurate rotation
period will be a challenge.
Andrey
Mezentsev
Some sources about this event and the original
observation (Stanislav
Korotkiy, in Russian) are summarize here:
http://www.ka-dar.ru/forum/index.php/topic,434.msg3385.html
http://www.astronomy.ru/forum/index.php/topic,17871.40.html
http://www.ka-dar.ru/forum/index.php/topic,460.0.html
IMAGES
George
Faillance
I did manage to image
it the night of July 4/5. I am sending you some images, out of 90
images that I took with my SBIG ST-9XE camera and my Celestron 11"
SCT working at f/6.3. The images were calibrated for bias, darks and flats using
MAXIM software, but they have not been combined. The scale of all the images is
19 min x 19 min, for the camera and the SCT at f/6.3. The timing of the images
was from UT (0:19:18) (JD2453921.51340) on 05/07/2006 to UT (01:07:38)
(JD2453921.54697).
(I have converted the
images to three animated GIF's to make the asteroid easier to identify. There
are two in the first and third and four in the second - RD)
Animated GIF 1
Animated GIF 2
Animated GIF 3
Composite of 276 images: http://www.practicalastronomer.com/2004xp14-1.jpg
The asteroid appears to occult a star in the
movie - these images are from before, during and after the occultation http://www.practicalastronomer.com/2004xp14occult.jpg The star is 10.76 mag TYC4226-1533-1
23h.46m.32s (first frame) to 00h 30m 49s (last frame). Each frame (36 in all) took about 5 secs to download, hence the dotted line. Co-ordinates for my observing site are 51deg 30'N, 0 deg 1' 12" W, at 7m above sea level. The image area appears to be centred on a point RA 18m 18', dec 63 deg 45'N, which was a little bit different to my calculated ephemeris (I downloaded the element data from the BAA link to Harvard and fed it into SkyMap).
Text on images is reproduced below.
2004 XP14 moving SW in Draco. 2006 July 4
from 23:31 to 23:40 UT and from 23:45 to 23:51 UT. Meade 14" SCT @ f5,
Meade DSI-Pro. Fred Stevenson, Andalsnes Observatory, Amersham, Bucks,
MOVIES
Eddie
Guscott
Movie of 276 images: http://www.practicalastronomer.com/2004xp14_2.m1v (it runs a lot better if you right click,
save as... on the link and play it locally on your hard drive) 6.8Mb mpeg file
Nick's movie (5MB animated GIF) was on ‘The
Astronomer’ website but has now been deleted.
There are two large animated gifs (~26 Mb each) at
http://www.iwmassociates.co.uk/2004XP14_20060704_centered.gif
http://www.iwmassociates.co.uk/2004XP14_20060704.gif
They cover about an hour from 23:38 UTC on July 4th to 00:41 UTC on July 5th
and two much smaller (~1.7 Mb) Windows Media files (same data) at
http://www.iwmassociates.co.uk/2004xp14.wmv and
http://www.iwmassociates.co.uk/2004xp14_moving.wmv
VISUAL OBSERVATIONS
I managed to find and track it last night from
22:45 until 22:55 UT when a layer of high cloud passed. Data from MPC seemed very accurate. Seemed to
be moving faster than anything I've seen before (Icarus, Comet 73P), but the
data showed only 68arcsec/min. More
cloud terminated further observation.
Index to observations received from ARPS
members