{"id":388,"date":"2007-12-06T00:05:59","date_gmt":"2007-12-06T00:05:59","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2007\/12\/06\/17p_holmes_dec\/"},"modified":"2021-11-28T00:46:03","modified_gmt":"2021-11-28T00:46:03","slug":"17p_holmes_dec","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2007\/12\/06\/17p_holmes_dec\/","title":{"rendered":"17P \/ Holmes &#8211; DEC 06, 2007"},"content":{"rendered":"<p style=\"text-align: center\"><a href=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2007\/img2007120601_17PHolmeslg.jpg\" onmouseover=\"rollover('img2007120601')\" onmouseout=\"rollout('img2007120601')\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2007\/img2007120601_17PHolmesA.jpg\" name=\"img2007120601\" alt=\"Step 1\" border=\"1\" color=\"FFFFFF\"><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2007\/img2007120601_17PHolmesB.jpg\");\n\/\/--><br \/>\n<\/script><br \/>\n<i>Move mouse over sketch above to view labels. Click image for larger version.<\/i><\/p>\n<p><b>Observation Notes:<\/b><\/p>\n<p>It&#8217;s hard to believe that it&#8217;s been a month since I last sketched this comet. It has truly become monstrous. To the naked eye, it is a large soft patch glowing in Perseus, and is still an incredible thing through binoculars. I no longer see any color in it&#8211;just a pale gray. It still possesses that trilobite appearance, but is much softer now. There is no visible pseudonucleus, and the central fan has become a soft spine. It looks to me like the southwest half of the coma is brighter.<\/p>\n<p>Using the astrometric eyepiece for measurements has been out of the question for some time now. Based on my sketch and comparison to the star field in Starry Nights Pro, I made some rough estimates:<\/p>\n<ul>\n<li>Central Fan: 12 x 60 arc minutes<\/li>\n<li>Coma: 60 x 75 arc minutes<\/li>\n<\/ul>\n<table color=\"ffffff\" width=\"470\" border=\"0\" cellspacing=\"2\" cellpadding=\"4\" style=\"line-height: 150%\">\n<tbody>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Subject<\/b><\/td>\n<td bgcolor=\"#3f4d6d\"><b style=\"color: white\">17P \/ Holmes<\/b><\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Classification<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Comet<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Position*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">04:00 UT &#8211; Perseus: [RA: 03:06:57.2 \/ Dec: +48:13:53]<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Size<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Central Fan: 12 x 60 arc minutes<br \/>\nComa: 60 x 75 arc minutes<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Brightness*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">~ 3.0 vMag<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Date\/Time<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">December 6, 2007, 9:30 PM<br \/>\n(December 7, 2007, 04:30 UT)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Observing Loc.<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Flagstaff, AZ &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Instrument<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">15 x 70 Oberwerk Binoculars<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Eyepieces\/Mag.<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Conditions<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Clear, breezy<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Seeing<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">4\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Transparency<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Mag 6.0 NELM<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>*Sources<\/b><\/td>\n<td bgcolor=\"#3f4d6d\"><a href=\"http:\/\/www.aerith.net\/comet\/catalog\/0017P\/2007.html\" target=\"_blank\" rel=\"noopener\">Aerith.net<\/a>; Starry Night Pro Plus 5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>17P\/Holmes 20071207<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10,45,15],"tags":[],"class_list":["post-388","post","type-post","status-publish","format-standard","hentry","category-comet","category-sg-comet","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":382,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/11\/08\/17p_holmes_nov_1\/","url_meta":{"origin":388,"position":0},"title":"17P \/ Holmes &#8211; 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