[BAA Comets] C/2018 A1 (PANSTARRS)

[Jon Shanklin]

The JPL database is always worth looking at see 
http://ssd.jpl.nasa.gov/sbdb.cgi<http://ssd.jpl.nasa.gov/sbdb.cgi> - in 
the case of 2018 A1 there is uncertainty of 13 days in the date of 
perihelion and one to five degrees in the angular orbital elements.  It 
is therefore not surprising that it isn't where the MPEC elements say it 
should be.

Regards,

Jon Shanklin
Meteorologist, Halley Research Station, Antarctica
https://legacy.bas.ac.uk/met/jds/notes_from_south_2017.htm

On 27/01/2018 09:02, Nick James wrote:
> Morning all,
>
> Last Thursday evening was clear here although there was a bright Moon.
>
> I obtained images of several comets and the field of C/2018 A1 
> (PANSTARRS). The faint fuzzy object at the centre of the attached 
> image is several arcmin south of the predicted position but the last 
> published orbit was in MPEC 2018-A43, dated Jan 11. This was based on 
> a relatively short arc. I've sent my astrometry to the MPC and if this 
> really is the comet then the orbit changes quite a bit from the one 
> published on MPEC 2018-043.
>
> Has anyone obtained astrometry of this comet recently? It is supposed 
> to be around mag 18.
>
> Nick.
>
>
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