[BAA Comets] DM001 EPHEMERIS

Fri Nov 9 14:33:20 GMT 2018

 Thanks Jon.  The field of view of the FT 2m telescopes is quite small - 10.5 x 10.5 arcmin.  So it sounds like it would be good to resubmit after a couple of days.  The FT have access to 2 2m scopes, one in Hawaii and one in Siding Springs, so the comet will be much better positioned that from here!  It might also be worth utilising their small scopes (1m or 0.4m) to get a bigger FOV and so a greater margin for divergence.
Helen
    On Friday, 9 November 2018, 14:21:26 GMT, Shanklin, Jonathan D. <jdsh at bas.ac.uk> wrote:  

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> 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The orbit is still rather fluid, but the ephemeris from Nakano on the CBET is probably no longer valid.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>On Behalf Of denis buczynski
Sent: 09 November 2018 13:40
To: BAA Comets Discussion List <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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