{"id":245,"date":"2006-04-20T22:00:00","date_gmt":"2006-04-20T22:00:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/04\/20\/ursa_minor\/"},"modified":"2021-11-27T23:40:17","modified_gmt":"2021-11-27T23:40:17","slug":"ursa_minor","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/04\/20\/ursa_minor\/","title":{"rendered":"Ursa Minor"},"content":{"rendered":"<p><a href=\"javascript:myVoid()\" onmouseover=\"rollover('img2006042001')\" onmouseout=\"rollout('img2006042001')\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2006\/img2006042001_UminorA.jpg\" name=\"img2006042001\" alt=\"Step 1\" border=\"1\" color=\"FFFFFF\"><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2006\/img2006042001_UminorB.jpg\");\n\/\/--><br \/>\n<\/script><!-- br--><i>Move mouse over sketch to see labels.<\/i><\/p>\n<p><!-- br--><\/p>\n<p><b>Observation Notes:<\/b><!-- br--><br \/>\nI wasn&#8217;t planning on a naked eye constellation sketch this evening. But the sky was so fantastically clear, and my <a href=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/000557.html\">new astronomy glasses<\/a> were doing such a great job, that I decided to see how deep I could go with Ursa Minor. When I began the sketch, I was picking up a lot of granularity throughout the constellation. By the time I had finished sketching the stars you see in the sketch, a fine gauze of cirrus had moved in, cutting off that granular appearance. The faintest I got was magnitude 6.8 with HIP 81757 (See rollover labels in the sketch).<\/p>\n<p>One feature of Ursa Minor I find interesting is the close star pairing at the first joint in the handle. I find it analogous to the Mizar\/Alcor pairing in Ursa Major, but much more difficult to resolve. Mizar and Alcor are 2nd and 4th magnitude stars that are separated by 11 arc minutes, and something I can separate with or without the glasses. The 2 Ursa Minor stars Delta- and 24-Ursa Minoris are 4.3 and 5.8 magnitude stars that are separated by 23 arc minutes. Although the separation is larger, they are both about 2 magnitudes fainter. Without the stargazing glasses, I only get the foggiest hint that there is more to Delta than just a single star. With the glasses, the two stars are distinct. If you get to a 6th magnitude observing site, give those stars a try and see what you can make out.<\/p>\n<table width=\"470\" border=\"1\" cellspacing=\"0\" cellpadding-left=\"4\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td>Ursa Minor<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Constellation<\/td>\n<\/tr>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>April 20, 2006 &#8211; 10:00 PM MST (April 21, 2006 &#8211; 05:00 UT)<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Anderson Mesa, AZ<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>Naked eye<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>N\/A<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Clear at first, then high cirrus, calm<\/td>\n<\/tr>\n<tr>\n<td><b>Seeing<\/b><\/td>\n<td>~5\/10<\/td>\n<\/tr>\n<tr>\n<td><b>Transparency<\/b><\/td>\n<td>Mag 6.8 (Based on HIP 81757)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Ursa Minor<\/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":[50,51,90,15],"tags":[],"class_list":["post-245","post","type-post","status-publish","format-standard","hentry","category-constellation","category-sg-constellation","category-sgc-ursa-minor","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":7,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/01\/naked_eye_sketc\/","url_meta":{"origin":245,"position":0},"title":"Naked Eye Sketches","author":"jperez1690","date":"August 1, 2004","format":false,"excerpt":"Naked Eye Sketch Gallery","rel":"","context":"In &quot;General&quot;","block_context":{"text":"General","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/general\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":214,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/11\/13\/wide_field_astr\/","url_meta":{"origin":245,"position":1},"title":"Wide Field Astrophotography &#8211; November 5 &#038; 6, 2005","author":"jperez1690","date":"November 13, 2005","format":false,"excerpt":"20051113","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":114,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/03\/10\/m108\/","url_meta":{"origin":245,"position":2},"title":"Messier 108","author":"jperez1690","date":"March 10, 2005","format":false,"excerpt":"M108","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":236,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/02\/25\/m109\/","url_meta":{"origin":245,"position":3},"title":"Messier 109","author":"jperez1690","date":"February 25, 2006","format":false,"excerpt":"M109","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":530,"url":"https:\/\/perezmedia.net\/beltofvenus\/2010\/03\/29\/messier_101_-_t\/","url_meta":{"origin":245,"position":4},"title":"Messier 101 &#8211; The Pinwheel Galaxy","author":"jperez1690","date":"March 29, 2010","format":false,"excerpt":"M101","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":289,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/25\/zeta_80_ursa_ma\/","url_meta":{"origin":245,"position":5},"title":"Zeta + 80 Ursae Majoris (Struve 1744\/Mizar and Alcor)","author":"jperez1690","date":"September 25, 2006","format":false,"excerpt":"Zeta + 80 Ursa Majoris","rel":"","context":"In &quot;Double Star&quot;","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"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\/245","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=245"}],"version-history":[{"count":1,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/245\/revisions"}],"predecessor-version":[{"id":795,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/245\/revisions\/795"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}