new visual comet discovery by Don Machholz

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  • #574171
    Denis Buczynski
    Participant

    This object is now designated as DM001 on the Posssible Comet Confimation Page of the Minor Planet Center

    Róbert Fidrich Photometry of performed by Daniel Bamberger on my 60-60s CCD images made using T20 refractor with green filters at itelescope.net Mayhill, NM show 10.2 magnitude total brighness.
    https://www.dropbox.com/s/flb6mbw4r33eer9/machholz.gif?dl=0

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    #580203
    Helen Usher
    Participant

    This looks worth following up 🙂 I tried to get the ephemerides from JPL/MPC but inputting DM001 is not recognised.  Any guidance on what/where to search for would be welcomed. 

    Thanks

    Helen

    #580204
    Denis Buczynski
    Participant

    Hi Helen, here is a preliminary ephemeris by Nakano published 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

    #580205
    Helen Usher
    Participant

    Thanks Denis 🙂  for both the data and the reference

    I have time on the Faulkes Telescope and so was hoping to gather some useful data on this comet – no chance of doing it from home!

    Helen

    #580209
    Nick James
    Participant

    I gave a talk to Newbury Astro Soc last Friday when I said that it was now very unlikely that we would get visual comet discoveries. How wrong I was! Congratulations to Don and the other independent discoverers of this comet.

    An ephemeris based on all the available astrometry up to this morning is here. It was produced using Bill Gray’s FindOrb. These elements are still very uncertain but it looks like it is heading to a perihelion in early December. It is currently moving south and the elongation is decreasing so it will become increasingly difficult to observe. From the UK it is currently a morning object amongst the galaxies in Virgo. The column headed “/sig gives some idea of the position uncertainty (in arcsec).

    Any observations (astrometry, photometry or images) would be gratefully received. 

    #580214
    Nick James
    Participant

    Denis and I managed to image this comet this morning from Scotland. I’ve just posted a very quick process of one of the images here.

    #580215
    David Swan
    Participant

    Very nice. Hopefully I’ll be granted a half hour patch of clear skies in the morning some day soon. D

    #580216
    owen brazell
    Participant

    I believe Peter Carson and Andrew Robertson saw this visually with an 18″ telescope from Suffolk this morning.proving that East Anglia does have the best weather 🙂 I am sure they will comment further.

    Owen

    #580217
    Nick James
    Participant

    Owen. Yes, Andrew Robertson and Peter Carson had a good view through Andrew’s 18-inch telescope at Haw Wood. They commented that the comet was bright and easy. 

    The latest ephemeris is here using all astrometry I have so far. I’ve done this starting 60 days before now and the positional uncertainties are now quite small. The comet has been at a small elongation for all of this time and was discovered when it was at its largest elongation. This is now decreasing. The comet has a small q (0.39 au) and is brightening rapidly.

    Please try to observe this comet at any opportunity.

    Nick. 

    #580218
    Grant Privett
    Participant

    What sort of brightness are we thinking?

    Tuesday morning is looking clear here….

    #580219
    Andrew Robertson
    Participant

    My sketch from this morning attached. Location Haw Wood, Suffolk, 18″ F4.5 Dobsonian, 13mm Ethos e/p, x160.Thanks to Owen for alerting me (I had no e-mail) and Nick for the latest accurate co-ordinates.

    Andrew

    #580220
    Nick James
    Participant

    Probably 7.5 – 8.0 this morning. Any predictions will be very unreliable since it could be in the final stages of a bright outburst or not. Getting up early to observe it is the only way to find out!

    #580221
    Nick James
    Participant

    Official designation is C/2018 V1.

    #580223
    David Swan
    Participant

    Clear skies this morning – 12/11/2018 05:08. Still quite bright, with ion tail visible.

    #580224
    David Swan
    Participant

    Found this (!) frame in the set.

    #580225
    David Swan
    Participant

    DDP tends to bloat the stars and make them furry. Here’s a clearer image with the ion tail quite distinct. 12 x 10s, midpoint 05:14:30.

    #580226
    David Swan
    Participant

    As Nick has said, the orbit is obviously very well determined. I updated MPCORB in Astrometrica, and the comet was spot on the predicted position.

    #580229
    Nick James
    Participant

    David – Great image showing the tail. Denis and I managed to get some astrometry on it this morning but the conditions were poor so our images are rubbish. 

    #580232
    Nick James
    Participant

    Here’s a quick process of a widefield image I took this morning with Denis Buczynski in northern Scotland. I’ll do a better job of processing this later and put the result on my members page. The galaxy is NGC4753.

    #580233
    David Swan
    Participant

    Am I imagining things, or are there two tails in this image?

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