{"id":375,"date":"2007-10-27T22:47:34","date_gmt":"2007-10-27T22:47:34","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2007\/10\/27\/17p_holmes_oct_2\/"},"modified":"2021-11-28T00:39:19","modified_gmt":"2021-11-28T00:39:19","slug":"17p_holmes_oct_2","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2007\/10\/27\/17p_holmes_oct_2\/","title":{"rendered":"17P \/ Holmes &#8211; OCT 27, 2007"},"content":{"rendered":"<p><b>Observation Notes:<\/b><\/p>\n<p>Due to extreme sleep deficit, I had to pass up detailed observing and sketching this comet tonight. To the naked eye, it now is clearly non-stellar and appears as an extremely tiny disc. Through binoculars, it is slap-in-the-face obvious and cream colored. Through the low power 48X view, it now appears about as large as it did at 240X just 3 nights ago. The overall structure is similar to what I saw last night, although a new soft disc of brighter material seems to be clearer in the center surrounding the condensed fan structure. The outer halo still appears mottled. It&#8217;s grown large enough that it&#8217;s about ready to outgrow the 120X view.<\/p>\n<p>Measurements with my astrometric eyepiece tonight yield:<\/p>\n<ul>\n<li>central condensation: 52 x 77 arc seconds<\/li>\n<li>coma: 310 arc seconds \/ 5.2 arc minutes<\/li>\n<li>outer halo: 682 arc seconds \/ 11.4 arc minutes<\/li>\n<\/ul>\n<p>The moon is starting to slip away, so as it grows larger and the surface brightness starts to drop it should be a great time to observe under dark skies.<\/p>\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\">Perseus: [RA: 03:50:00.8 \/ Dec: +50:21:11]<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Size<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Central condensation: 52 x 77 arc seconds<br \/>\nComa: 310 arc seconds \/ 5.2 arc minutes<br \/>\nOuter halo: 682 arc seconds \/ 11.4 arc minutes<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Brightness*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">~ 2.5 vMag<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Date\/Time<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">October 27, 2007, 10:30 PM<br \/>\n(October 28, 2007, 05:30 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\">Orion XT8 (203 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Eyepieces\/Mag.<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">25 mm Sirius Pl\u00c3\u00b6ssl (48X)<br \/>\n10 mm Sirius Pl\u00c3\u00b6ssl + 2X Barlow (240X)<br \/>\n12 mm Meade Astrometric + 2X Barlow (~200X)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Conditions<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Clear, calm, gibbous moon<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Seeing<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">3\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Transparency<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">~ Mag 4.5 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 20071027<\/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],"tags":[],"class_list":["post-375","post","type-post","status-publish","format-standard","hentry","category-comet"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":378,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/10\/29\/17p_holmes_oct_3\/","url_meta":{"origin":375,"position":0},"title":"17P \/ Holmes &#8211; OCT 28, 2007","author":"jperez1690","date":"October 29, 2007","format":false,"excerpt":"17P\/Holmes 20071028","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":372,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/10\/26\/17p_holmes_oct\/","url_meta":{"origin":375,"position":1},"title":"17P \/ Holmes &#8211; OCT 26, 2007","author":"jperez1690","date":"October 26, 2007","format":false,"excerpt":"17P\/Holmes 20071025","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":380,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/11\/01\/17p_holmes_oct_4\/","url_meta":{"origin":375,"position":2},"title":"17P \/ Holmes &#8211; OCT 31, 2007","author":"jperez1690","date":"November 1, 2007","format":false,"excerpt":"17P\/Holmes 20071031","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":381,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/11\/04\/17p_holmes_nov\/","url_meta":{"origin":375,"position":3},"title":"17P \/ Holmes &#8211; NOV 3, 2007","author":"jperez1690","date":"November 4, 2007","format":false,"excerpt":"17P\/Holmes 20071103","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":374,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/10\/27\/17p_holmes_oct_1\/","url_meta":{"origin":375,"position":4},"title":"17P \/ Holmes &#8211; OCT 26, 2007","author":"jperez1690","date":"October 27, 2007","format":false,"excerpt":"17P\/Holmes 20071026","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":370,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/10\/25\/p17_holmes\/","url_meta":{"origin":375,"position":5},"title":"17P \/ Holmes &#8211; OCT 24, 2007","author":"jperez1690","date":"October 25, 2007","format":false,"excerpt":"17P\/Holmes 20071024","rel":"","context":"In &quot;Comet&quot;","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/comments?post=375"}],"version-history":[{"count":1,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/375\/revisions"}],"predecessor-version":[{"id":856,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/375\/revisions\/856"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}