{"id":519,"date":"2010-01-10T16:15:12","date_gmt":"2010-01-10T16:15:12","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2010\/01\/10\/ngc_2169_and_st\/"},"modified":"2021-11-28T01:33:29","modified_gmt":"2021-11-28T01:33:29","slug":"ngc_2169_and_st","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2010\/01\/10\/ngc_2169_and_st\/","title":{"rendered":"NGC 2169 and Struve 848"},"content":{"rendered":"<div class=\"imageblock\"><a href=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009010201_NGC2169lg.jpg\" onmouseover=\"rollover('img2009010201')\" onmouseout=\"rollout('img2009010201')\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009010201_NGC2169A.jpg\" name=\"img2009010201\" alt=\"Sketch of NGC 2169 (37 Cluster) and Struve 848 (STF 848)\"><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009010201_NGC2169B.jpg\");\n\/\/--><br \/>\n<\/script><\/p>\n<p class=\"caption\">Sketch of NGC 2169 (The 37 Cluster) and Struve 848<\/p>\n<p><i>Move mouse over image to view label.<br \/>\nClick for larger version.<\/i><\/p>\n<\/div>\n<p><b>Observation Notes<\/b><\/p>\n<p>So many old sketches, so little time&#8211;this one is over a year old.<\/p>\n<p>NGC 2169 really did look like an upside-down, angular #37. I plotted 19 stars in the immediate vicinity of the cluster, which appeared to be about 4 x 5 arc minutes in size. One golden-yellow star glimmered in the number 7 on the northwest side of the cluster.<\/p>\n<p>Several doubles marked the field, but one in particular drew me in. The brightest star in the cluster, on the northern corner of the number 3 appeared elongated at 120X. I inserted the 2X barlow and found that it was indeed a close double. The primary appeared white with a dull blue secondary. I broke out the astrometric eyepiece and measured a PA of 112 degrees and estimated a separation of 1.5 arc seconds based on the diffraction pattern.<\/p>\n<p>After coming inside, I headed over to <a href=\"http:\/\/vizier.u-strasbg.fr\/viz-bin\/VizieR\" target=\"_blank\" rel=\"noopener\">Vizier<\/a> and found the identity of the double as Struve 848. The star positions I sketched in the cluster could use some help, as seen in the DSS comparison below. Perhaps another time!<\/p>\n<div class=\"imageblock\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2009\/img2009010201_NGC2169dss.jpg\" alt=\"Sketch\/DSS Photo Comparison of NGC 2169 (37 Cluster)\"><\/p>\n<p class=\"caption\">Sketch\/DSS Photo Comparison of NGC 2169 (The 37 Cluster)<\/p>\n<\/div>\n<table class=\"objectdata\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td class=\"subject\">NGC 2169 (37 Cluster)<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Open Cluster (III 3 m)<\/td>\n<\/tr>\n<tr>\n<td><b>AKA*<\/b><\/td>\n<td>Cr 83, OCL 481, Lund 206, H VIII-24, h 379, GC 1361<\/td>\n<\/tr>\n<tr>\n<td><b>Position*<\/b><\/td>\n<td>Orion: [RA: 06 08 24.3 \/ Dec. +13 57 53]<\/td>\n<\/tr>\n<tr>\n<td><b>Size*<\/b><\/td>\n<td>6&#8242;<\/td>\n<\/tr>\n<tr>\n<td><b>Magnitude*<\/b><\/td>\n<td>vMag 5.9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table class=\"objectdata\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td class=\"subject\">Struve 848 (STF 848 \/ ADS 4728)<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Multiple Star<\/td>\n<\/tr>\n<tr>\n<td><b>Position (J2000)*<\/b><\/td>\n<td>Orion [RA: 06 08 30.3 \/ Dec: +13 58 16]<\/td>\n<\/tr>\n<tr>\n<td><b>Position Angle<\/b><\/td>\n<td>AB: 112\u00b0 [My Measurement 2009.0]<br \/>\nAB: 108\u00b0 [CCDM 1951]*<br \/>\nAC: 291\u00b0 [CCDM 1985]*<br \/>\nAD: 125\u00b0 [CCDM 1985]*<\/td>\n<\/tr>\n<tr>\n<td><b>Separation<\/b><\/td>\n<td>AB: 1.5&#8243; [My Measurement 2009.0]<br \/>\nAB: 2.5&#8243; [CCDM 1951]*<br \/>\nAC: 17.3&#8243; [CCDM 1985]*<br \/>\nAD: 27.5&#8243; [CCDM 1985]*<\/td>\n<\/tr>\n<tr>\n<td><b>Magnitudes*<\/b><\/td>\n<td>A: 7.3; B: 8.2<\/td>\n<\/tr>\n<tr>\n<td><b>Spectral Types*<\/b><\/td>\n<td>A: B1V; B: B2V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table class=\"objectdata\">\n<tbody>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>JAN 2, 2009 &#8211; 12:15 AM (JAN 2, 2009 &#8211; 07:15 UT)<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Flagstaff, Arizona &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>Orion SkyQuest XT8 Dobsonian (203 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>Pentax XW10 (120X)<br \/>\nPentax XW10 + 2X Barlow (240X)<br \/>\nMeade Astrometric EP + 2X Barlow (200X)<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Clear, cold, calm<\/td>\n<\/tr>\n<tr>\n<td><b>Seeing<\/b><\/td>\n<td>6\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td><b>Transparency<\/b><\/td>\n<td>Mag 5.8 NELM<\/td>\n<\/tr>\n<tr>\n<td><b>*Sources<\/b><\/td>\n<td><a href=\"http:\/\/www.ngcicproject.org\" target=\"_blank\" rel=\"noopener\">NGCIC Project<\/a>; <a href=\"http:\/\/archive.stsci.edu\/dss\/acknowledging.html\" target=\"_blank\" rel=\"noopener\">DSS<\/a>; The Washington Visual Double Star Catalog (Mason+ 2001-2010); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>NGC 2169<\/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":[16,56,24,19,57,25,22,52],"tags":[],"class_list":["post-519","post","type-post","status-publish","format-standard","hentry","category-deep-sky","category-double-star","category-open-cluster","category-sg-deep-sky","category-sg-double-star","category-sg-open-cluster","category-sg-star-cluster","category-sgc-orion"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":267,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/08\/20\/ngc_1502_and_st\/","url_meta":{"origin":519,"position":0},"title":"NGC 1502 and Struve 485","author":"jperez1690","date":"August 20, 2006","format":false,"excerpt":"NGC 1502","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":547,"url":"https:\/\/perezmedia.net\/beltofvenus\/2010\/10\/03\/destinations_al\/","url_meta":{"origin":519,"position":1},"title":"Destinations Along the Winter Milky Way","author":"jperez1690","date":"October 3, 2010","format":false,"excerpt":"Photograph of Winter Milky Way over Sunset Crater with sketches of deep sky objects in the area. Move mouse over sketch above to see where each deep sky object resides. Click image for larger version. Click here for larger version without call-out lines. . . . . . Other Print\u2026","rel":"","context":"In &quot;Astro Photography&quot;","block_context":{"text":"Astro Photography","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/astro-photography\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":108,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/02\/12\/m103\/","url_meta":{"origin":519,"position":2},"title":"Messier 103","author":"jperez1690","date":"February 12, 2005","format":false,"excerpt":"M103","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":104,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/02\/04\/m47_and_ngc_242\/","url_meta":{"origin":519,"position":3},"title":"Messier 47 and NGC 2423","author":"jperez1690","date":"February 4, 2005","format":false,"excerpt":"M047","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":271,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/08\/28\/ngc_663\/","url_meta":{"origin":519,"position":4},"title":"NGC 663","author":"jperez1690","date":"August 28, 2006","format":false,"excerpt":"NGC 0663","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":105,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/02\/04\/m46_and_ngc_243\/","url_meta":{"origin":519,"position":5},"title":"Messier 46 and NGC 2438","author":"jperez1690","date":"February 4, 2005","format":false,"excerpt":"M046","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"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\/519","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=519"}],"version-history":[{"count":2,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/519\/revisions"}],"predecessor-version":[{"id":920,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/519\/revisions\/920"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}