<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1526041202475_4239"><span id="yui_3_16_0_ym19_1_1526041202475_4238">Hi Mike, <br></span></div><div id="yui_3_16_0_ym19_1_1526041202475_4243" dir="ltr"><span id="yui_3_16_0_ym19_1_1526041202475_4238">Thanks for the image of 74p,it will be entered into the BAA Comet Archive at the next visit. It would be best to submit regular coemt images to cometobs@britastro.org rather than the discussion list. The discussion list is provided as a platform for members to introduce subjects for discussion or ask questions of queries. <br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1526041202475_4431"><span id="yui_3_16_0_ym19_1_1526041202475_4238">I am not familiar with the Maxim/Pinpoint astrometry function. I use Astrometrica for my astrometry. The difference between you results and the ephemeris is probably due to the ephemeris needing to be updated. The reason for making the astometric measurement is to provide new astrometic data to be used for orbit and ephemeris update.Comets are moving through the solar system under a variety of influences and their exact position at any one time cannot be predicted.</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1526041202475_4532"><span id="yui_3_16_0_ym19_1_1526041202475_4238">I notice that you mentioned that you were having focus problems with your system. Looking at your image it seems to me that the problem you are have with flare to one side of all the images across the field is likely to be due to a squaring on error (ie the ccd is not square on to the optical axis of the telescope) I am sure you will be able to adjust this and get rid of the flare you see on all the stars. You have a very nice set up for comet imaging with a quality telescope and ccd camera.</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1526041202475_4713"><span id="yui_3_16_0_ym19_1_1526041202475_4238">I hope all this helps, keep sending the images.</span></div><div dir="ltr"><span id="yui_3_16_0_ym19_1_1526041202475_4238">Denis Buczynski<br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1526041202475_4710"><span id="yui_3_16_0_ym19_1_1526041202475_4238"> <br></span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1526041202475_4237"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1526041202475_4163" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1526041202475_4162"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1526041202475_4161"> <div dir="ltr" id="yui_3_16_0_ym19_1_1526041202475_4236"> <font id="yui_3_16_0_ym19_1_1526041202475_4235" size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Mike Paling <mikepaling@madasafish.com><br> <b><span style="font-weight: bold;">To:</span></b> comets-disc@lists.britastro.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, 11 May 2018, 11:17<br> <b><span style="font-weight: bold;">Subject:</span></b> [BAA Comets] Comet 74P near M66 and M65<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1526041202475_4160"><br><div id="yiv1117922990">
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<div id="yui_3_16_0_ym19_1_1526041202475_4156"><font id="yui_3_16_0_ym19_1_1526041202475_4234" face="Times New Roman">I am attaching a jpeg of Comet 74P taken on
4th May 2018</font></div>
<div id="yui_3_16_0_ym19_1_1526041202475_4516"><font face="Times New Roman"></font> </div>
<div id="yui_3_16_0_ym19_1_1526041202475_4504"><font id="yui_3_16_0_ym19_1_1526041202475_4503" 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></div></div>_______________________________________________<br>Comets-disc mailing list<br><a ymailto="mailto:Comets-disc@lists.britastro.org" href="mailto:Comets-disc@lists.britastro.org">Comets-disc@lists.britastro.org</a><br><a href="http://lists.britastro.org/mailman/listinfo/comets-disc" target="_blank">http://lists.britastro.org/mailman/listinfo/comets-disc</a><br><br><br></div> </div> </div> </div></div></body></html>