{"id":335,"date":"2007-07-01T01:47:38","date_gmt":"2007-07-01T01:47:38","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2007\/07\/01\/delta_bootis_st\/"},"modified":"2007-07-01T01:47:38","modified_gmt":"2007-07-01T01:47:38","slug":"delta_bootis_st","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/01\/delta_bootis_st\/","title":{"rendered":"Delta Bo&ouml;tis (Struve 27)"},"content":{"rendered":"<p style=\"text-align: center\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2007\/img2007042901_DeltaBOO.jpg\" border=\"1\" color=\"ffffff\"><\/p>\n<p><b>Observation Notes:<\/b><\/p>\n<p>The constellation of Bo\u00c3\u00b6tes is chock full of bright, colorful double stars. Delta Bo\u00c3\u00b6tis is a wide double that presented me with an interesting color scheme. PA appeared to be about 78 degrees, and separation about 144 arcseconds. Actual values are 78 degrees (Yes!) and 104.9 arcseconds. The primary color was yellow-orange, and the secondary appeared deep blue. This coloration appeared strongest at low power (37.5X). The strange thing is that while the primary&#8217;s spectral classification of G8III is appropriate for the yellow-orange color, the secondary is a G0V star, and should appear yellowish rather than blue. Since this is a wide double, I was perplexed that color contrast effects could take place over such a wide distance. I did some searching online, and found that I&#8217;m not alone in seeing this spurious color. Here is a sample of what other observers have seen:<\/p>\n<ul>\n<li><a href=\"http:\/\/www.visualdeepsky.org\/logs\/msg04704.html\" target=\"_blank\" rel=\"noopener\">St\u00c3\u00a9phane Meloche<\/a>: Gold \/ White<\/li>\n<li><a href=\"http:\/\/homepage.mac.com\/edkaufman\/.Public\/starhopping\" target=\"_blank\" rel=\"noopener\">Edwin H. Kaufman, Jr.<\/a>: White \/ Deep Blue<\/li>\n<li><a href=\"http:\/\/www.saguaroastro.org\/content\/db\/textversions\/BOOTES.TXT\" target=\"_blank\" rel=\"noopener\">Steve Coe<\/a>: White \/ Blue<\/li>\n<li><a href=\"http:\/\/www.cloudynights.com\/ubbthreads\/download.php?Number=14499\">An observer at Cloudynights.com (MS Excel document)<\/a>: Yellow \/ Blue<\/li>\n<li><a href=\"http:\/\/www.dholt.us\/Astro\/Logs\/030630.pdf\">Dave Holt<\/a>: Yellow \/ Blue<\/li>\n<\/ul>\n<p>Further information about this double can be found here:<br \/>\n<a href=\"http:\/\/www.astro.uiuc.edu\/~kaler\/sow\/deltaboo.html\">http:\/\/www.astro.uiuc.edu\/~kaler\/sow\/deltaboo.html<\/a><\/p>\n<table color=\"ffffff\" width=\"470\" border=\"0\" cellspacing=\"2\" cellpadding=\"4\" style=\"line-height: 150%\">\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Subject<\/b><\/td>\n<td bgcolor=\"#3f4d6d\"><b style=\"color: white\">Delta Bo\u00c3\u00b6tis (STF 27)<\/b><\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Classification<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Double Star<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Position (J2000)<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Bo\u00c3\u00b6tes [RA: 15:15:30.2 \/ Dec: +33:18:52]*<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Position Angle*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">78\u00c2\u00b0 (1835)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Separation*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">104.9&#8243; (1835)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Magnitudes*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">A: 3.47 \/ B: 7.84<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Spectral Types*<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">A: G8III \/ B: G0V<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Date\/Time<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">APR 29, 2007 &#8211; 12:20 AM MST (APR 29, 2007 &#8211; 07:20 UT)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Observing Loc.<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Flagstaff, AZ (Home)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Instrument<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Orion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Eyepieces\/Mag.<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">10 mm + 2X Barlow (240X)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Conditions<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">Mostly clear, slightly breezy, nearly full moon<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Seeing<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">5-6\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>Transparency<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">NELM Mag ~5.0<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#3f4d6d\"><b>References<\/b><\/td>\n<td bgcolor=\"#3f4d6d\">The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); 13th General Catalogue of MK Spectral Classification (Buscombe 1998)<\/td>\n<\/tr>\n<\/table>\n<p>*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Delta BOO<\/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":[56,57,93,15],"tags":[],"class_list":["post-335","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-botes","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":325,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/04\/25\/tau1_hydrae_hj\/","url_meta":{"origin":335,"position":0},"title":"Tau-1 Hydrae (HJ 1167)","author":"jperez1690","date":"April 25, 2007","format":false,"excerpt":"Tau1 Hydrae","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":[]},{"id":464,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/04\/05\/delta_serpentis\/","url_meta":{"origin":335,"position":1},"title":"Delta Serpentis (Struve 1954)","author":"jperez1690","date":"April 5, 2009","format":false,"excerpt":"Delta Serpentis","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":304,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/12\/02\/gamma_leonis_al\/","url_meta":{"origin":335,"position":2},"title":"Gamma Leonis (Algieba \/ Struve 1424)","author":"jperez1690","date":"December 2, 2006","format":false,"excerpt":"Gamma Leonis","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":[]},{"id":336,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/12\/mu_bootis\/","url_meta":{"origin":335,"position":3},"title":"Mu Bootis (Struve 28 \/ 1938)","author":"jperez1690","date":"July 12, 2007","format":false,"excerpt":"Mu Bootis","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":[]},{"id":345,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/15\/alpha_scorpii_a\/","url_meta":{"origin":335,"position":4},"title":"Alpha Scorpii (Antares \/ GNT 1)","author":"jperez1690","date":"July 15, 2007","format":false,"excerpt":"Alpha Scorpii","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":[]},{"id":305,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/12\/02\/54_leonis_struv\/","url_meta":{"origin":335,"position":5},"title":"54 Leonis (Struve 1487)","author":"jperez1690","date":"December 2, 2006","format":false,"excerpt":"54 Leonis","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\/335","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=335"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/335\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}