<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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--></style></head><body lang=EN-GB link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I went out tonight in between the showers and in hazy skies to a local dark site and to my surprise found it was pretty easy in 11x70 binoculars as a large haze. It was difficult to determine any shape due to trying to hold binos steady in a cold brisk wind.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Owen</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows 10</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='border:none;padding:0cm'><b>From: </b><a href="mailto:ndj@nickdjames.com">Nick James</a><br><b>Sent: </b>28 November 2018 17:59<br><b>To: </b><a href="mailto:comets-disc@lists.britastro.org">BAA Comets discussion list</a><br><b>Subject: </b>[BAA Comets] 46P now 6th magnitude</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi all,</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Denis Buczynski has been imaging this comet from 58 deg north latitude </p><p class=MsoNormal>so it is definitely observable from the UK when the weather co-operates. </p><p class=MsoNormal>A chart showing the comet's track through December is here:</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>https://www.britastro.org/node/16287</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The attached is a single 180s Green filter exposure of 46P taken with </p><p class=MsoNormal>iTelescope T14 in New Mexico. This is a Tak 106mm FSQ with a 4x2.5 </p><p class=MsoNormal>degree FoV. The image was reduced using comphot against UCAC-4 V mags. I </p><p class=MsoNormal>get a total magnitude of 6.1 with a coma diameter of 37 arcmin. This is </p><p class=MsoNormal>similar to the visual mags on COBS and with the result that David Swan </p><p class=MsoNormal>reported using iTel T9 and the same analysis tool a few days ago:</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>https://www.britastro.org/node/16500</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I think this shows that comphot can give results that are consistent </p><p class=MsoNormal>with visual if you use the right instrument. I have imaging booked on </p><p class=MsoNormal>T14 every few days now up until mid December and so this will be an </p><p class=MsoNormal>interesting test of how well we can determine magnitudes of such a </p><p class=MsoNormal>diffuse object.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please try to observe this object through December and consider using </p><p class=MsoNormal>comphot to analyze your images. You can download it from here:</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>https://www.britastro.org/node/11124</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nick.</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>