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<DIV>Hi Mike,</DIV>
<DIV>That’s a very nice image. </DIV>
<DIV> </DIV>
<DIV>If you haven’t already, send it to Denis Buczynski at <A
href="mailto:cometobs@britastro.org">cometobs@britastro.org</A> so it gets
included in the BAA Comet Section archive. The archive can me found at <A
title=http://www.britastro.org/cometobs/
href="http://www.britastro.org/cometobs/">http://www.britastro.org/cometobs/</A></DIV>
<DIV>I’m not familiar with “Sky Live” but don’t think you should be worrying
about the very small discrepancy between your measured position and the
predicted position. At your imaging scale the difference amounts to a fraction
of a camera pixel in RA and about 1 pixel in Dec. </DIV>
<DIV>If you want to do really accurate astrometry I suggest you use software
called Astrometrica. See <A title=http://www.astrometrica.at/
href="http://www.astrometrica.at/">http://www.astrometrica.at/</A> its quite
difficult to set up but once you’ve worked that out then it dead easy to use and
produces measures to a fraction of a second of arc.</DIV>
<DIV>Keep up the good work.</DIV>
<DIV> </DIV>
<DIV>Peter Carson</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=mikepaling@madasafish.com
href="mailto:mikepaling@madasafish.com">Mike Paling</A> </DIV>
<DIV><B>Sent:</B> Friday, May 11, 2018 11:15 AM</DIV>
<DIV><B>To:</B> <A title=comets-disc@lists.britastro.org
href="mailto:comets-disc@lists.britastro.org">comets-disc@lists.britastro.org</A>
</DIV>
<DIV><B>Subject:</B> [BAA Comets] Comet 74P near M66 and M65</DIV></DIV></DIV>
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<DIV><FONT face="Times New Roman">I am attaching a jpeg of Comet 74P taken on
4th May 2018</FONT></DIV>
<DIV><FONT face="Times New Roman"></FONT> </DIV>
<DIV><FONT face="Times New Roman">Hopefully not too large and it has the correct
designation and that I have sent it to the correct place.<BR><BR>My imaging took
place during a single evening ....<BR>Equipment: APM LZOS123/780 f6 refractor
and APM Flattener<BR>Camera: Moravian G2 8300 Mono
CCD<BR>Subs on image taken on 4th May
2018: 20 x 100sec CLS
subs<BR>Software: MaximDL and
Photoshop<BR>Location: Garden Observatory 15 miles north of
Nottingham.</FONT></DIV>
<DIV><FONT face="Times New Roman"><BR>I ran my processed FITS image through the
"Maxim/PinPoint DC3" Astrometrric process ... <BR>and compared my measurements
with an online ephemeris calculator (The Sky <BR>Live) and found a slight
disparity between them as follows;<BR><BR>Maxim/PinPoint Coordinates: 11h 20m
02.96s +12h 53' 10.7"<BR>The Sky Live
Coordinates: 11h 20m
02.2s +12h 53' 14.3"<BR><BR>They are
both very similar .... but am I doing something wrong
here?<BR><BR>Regards<BR>Mike Paling</FONT><BR><BR></DIV></DIV></DIV>
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