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<p>The JPL database is always worth looking at see
<a class="moz-txt-link-freetext" href="http://ssd.jpl.nasa.gov/sbdb.cgi">http://ssd.jpl.nasa.gov/sbdb.cgi</a><a
href="http://ssd.jpl.nasa.gov/sbdb.cgi"></a>
- 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.<br>
</p>
<pre class="moz-signature" cols="72">Regards,
Jon Shanklin
Meteorologist, Halley Research Station, Antarctica
<a class="moz-txt-link-freetext" href="https://legacy.bas.ac.uk/met/jds/notes_from_south_2017.htm">https://legacy.bas.ac.uk/met/jds/notes_from_south_2017.htm</a></pre>
<div class="moz-cite-prefix">On 27/01/2018 09:02, Nick James wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9bf5dca7-d210-d692-ac20-8d2a35257b8b@nickdjames.com">Morning
all,
<br>
<br>
Last Thursday evening was clear here although there was a bright
Moon.
<br>
<br>
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.
<br>
<br>
Has anyone obtained astrometry of this comet recently? It is
supposed to be around mag 18.
<br>
<br>
Nick.
<br>
<br>
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</pre>
</blockquote>
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