[BAA Comets] DM001 EPHEMERIS
Shanklin, Jonathan D.
jdsh at bas.ac.uk
Fri Nov 9 14:20:44 GMT 2018
Although the designation is likely to be 2018 V1, this is not guaranteed, hence the use of DM001 as a preliminary designation.
I’m not sure what the field of view of the Faulkes Telescope is, but the Nakano ephemeris and that based on the latest observations diverge by at least 6 minutes by November 15. You should be OK for a couple of days, but it might then be worth a resubmission. Also the comet will be quite low – I think around 20 degrees altitude at the start of twilight.
Regards,
Jon Shanklin
Visual Co-ordinator, BAA Comet Section
http://www.ast.cam.ac.uk/~jds/
From: Comets-disc <comets-disc-bounces at lists.britastro.org> On Behalf Of Helen Usher
Sent: 09 November 2018 14:03
To: denis buczynski <buczynski8166 at btinternet.com>; BAA Comets discussion list <comets-disc at lists.britastro.org>
Subject: Re: [BAA Comets] DM001 EPHEMERIS
Hi Jon,
Thanks for this. I've just submitted an observation run request to the Faulkes Telescope and have used their MPC lookup using the designation 2018 V1. I've asked for one image a day for 6 days. Do you think the elements will be robust enough to last 6 days, or should I resubmit each day in case the elements get refined?
Thanks
Helen
On Friday, 9 November 2018, 13:57:57 GMT, Shanklin, Jonathan D. <jdsh at bas.ac.uk<mailto:jdsh at bas.ac.uk>> wrote:
The orbit is still rather fluid, but the ephemeris from Nakano on the CBET is probably no longer valid.
This ephemeris uses the latest PCCP orbit:
Ephemeris for DM001 DM001
Omega= 80.0525 OMEGA=125.3290 i=149.1079 q= 0.429752 a= 51.051556
e=0.991582 P= 364.765 T= 2018 December 2.9708 Equinox= 2000
Magnitudes calculated from m=10.9+5.0*Log(d)+15.0*Log(r)+0.000*Beta
Station: Cambridge
Latitude: 52.213 Longitude: 0.000 Magnetic variation: 0.0
Observing constraints: Sun below -13. deg Object above***** deg
November 2018 Positions for 00:00 ET, Times in UT
Elong Moon Comet
Day R.A. B1950 Dec R.A. J2000 Dec Mag D R Trans Observable Sun Moon Phase Tail pA d RA dDec
9/10 12 25.1 -2.02 12 27.6 -2.18 8.8 1.08 0.71 9.12 4.42 to 5.47 40 69 5 19 294 0 0
10/11 12 30.4 -1.54 12 32.9 -2.10 8.6 1.04 0.69 9.14 4.38 to 5.48 40 80 11 22 295 32 3
11/12 12 36.1 -1.46 12 38.7 -2.03 8.4 1.00 0.68 9.15 4.35 to 5.50 40 91 18 26 295 35 3
12/13 12 42.4 -1.38 12 44.9 -1.55 8.1 0.97 0.66 9.18 4.32 to 5.51 39 102 26 30 296 39 3
13/14 12 49.2 -1.31 12 51.8 -1.47 7.8 0.93 0.64 9.21 4.31 to 5.53 39 112 35 35 297 42 3
14/15 12 56.7 -1.23 12 59.3 -1.39 7.6 0.90 0.62 9.24 4.30 to 5.54 38 122 44 41 298 46 3
It will almost certainly change further as more observations come in and the observational arc is extended.
Regards,
Jon Shanklin
Visual Co-ordinator, BAA Comet Section
http://www.ast.cam.ac.uk/~jds/
From: Comets-disc <comets-disc-bounces at lists.britastro.org<mailto:comets-disc-bounces at lists.britastro.org>> On Behalf Of denis buczynski
Sent: 09 November 2018 13:40
To: BAA Comets Discussion List <comets-disc at lists.britastro.org<mailto:comets-disc at lists.britastro.org>>
Subject: [BAA Comets] DM001 EPHEMERIS
On CBET 4569
Nakano provides the following preliminary ephemeris for the comet:
2018 TT R.A. (2000) Decl. Delta r
Nov. 5 12 06.22 -02 26.5 1.549 1.013
6 12 10.91 -02 21.2 1.549 1.012
7 12 15.60 -02 15.7 1.550 1.011
8 12 20.29 -02 10.2 1.550 1.011
9 12 24.97 -02 04.6 1.551 1.012
10 12 29.64 -01 59.0 1.552 1.012
11 12 34.30 -01 53.3 1.553 1.013
12 12 38.95 -01 47.6 1.555 1.014
13 12 43.59 -01 41.8 1.556 1.015
14 12 48.22 -01 36.0 1.558 1.017
15 12 52.84 -01 30.2 1.560 1.019
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