{"id":290,"date":"2006-09-25T20:10:00","date_gmt":"2006-09-25T20:10:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/09\/25\/kappa_bootis_st\/"},"modified":"2006-09-25T20:10:00","modified_gmt":"2006-09-25T20:10:00","slug":"kappa_bootis_st","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/25\/kappa_bootis_st\/","title":{"rendered":"Kappa Bo&ouml;tis (Struve 1821)"},"content":{"rendered":"<p style=\"text-align: center\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2006\/img2006092501_KappaBOO.jpg\" border=\"1\" color=\"ffffff\"><\/p>\n<p><b>Observation Notes:<\/b><\/p>\n<p>This was a subtle and uneven pair. The PA appeared to be 225\u00c2\u00b0 with a separation that was obout 1\/36 of the 12 arc minute FOV&#8211;which works out to about 20 arc seconds. Actual values are 236\u00c2\u00b0 and 13.4 arc seconds. <\/p>\n<p>The primary appeared pale yellow with a dull blue secondary. I became a bit frustrated when I was preparing the report for this observation because the primary of this pair is A7V with a F1V secondary. So if anything, I <i>should<\/i> have seen a light blue primary with a pale yellow primary or a version of that where one of the components was white. Instead I actually had the colors swapped. I decided to do some hunting to see what other observers saw. I found that quite a few that actually mentioned color noted the same swap that I did. Here are the links to those sites:<\/p>\n<ul>\n<li><a href=\"http:\/\/x.astrogeek.org\/observations\/log.php?object_id=529\" target=\"_blank\" rel=\"noopener\">Jeff Burton&#8217;s Astronomy Blog<\/a> (White\/Blue)<\/li>\n<li><a href=\"http:\/\/www.saguaroastro.org\/content\/db\/textversions\/BOOTES.TXT\" target=\"_blank\" rel=\"noopener\">Bootes Object List &#8211; Steve Coe<\/a> (White\/Light Blue)<\/li>\n<li><a href=\"http:\/\/forums.astronomydaily.com\/viewtopic.php?p=8298\" target=\"_blank\" rel=\"noopener\">Astronomy Daily Forum &#8211; Trane Francks<\/a>  (White\/Blue)<\/li>\n<li><a href=\"http:\/\/ftp.funet.fi\/pub\/astro\/dbases\/stars\/multistr.txt\" target=\"_blank\" rel=\"noopener\">Multiple Star List &#8211; Bill Anderson, et. al.<\/a> (White\/Blue)<\/li>\n<li><a href=\"http:\/\/www.linnhe2.free-online.co.uk\/downloads\/Constellation%20Observation%20Guide.rtf\" target=\"_blank\" rel=\"noopener\">Constellation Observer Guide &#8211; Mark S. Baines<\/a> (Gold\/Blue)<\/li>\n<li><a href=\"http:\/\/www.mso.anu.edu.au\/cas\/southerncross\/sc_199706.html\" target=\"_blank\" rel=\"noopener\">Canberra Astronomical Society &#8211; Ross Gould<\/a> (Pale Yellowish-Green\/Bluish Purple)<\/li>\n<li><a href=\"http:\/\/wgg.com\/scope\/dbl.html\" target=\"_blank\" rel=\"noopener\">AL Double Star Observating Log &#8211; M. Bracewell<\/a> (Yellow\/Bluish)<\/li>\n<\/ul>\n<p>Search for &#8220;Kappa&#8221; at those links until you encounter Kappa BOO. These observers (as long as they are listing the primary first) are seeing a bluish secondary every time, and a white or yellow primary. This appears to be a pretty deceptively colored double. But not everyone was deceived:<\/p>\n<p><i>Double and Multiple Stars and How to Observe Them<\/i> by James Mullaney features a sketch by Sissy Haas that sports a white primary with a pale yellow secondary.<br \/>\nSee also, Richard Bell&#8217;s <a href=\"http:\/\/www.richardbell.net\/DoubleStars\/dslog6.html\" target=\"_blank\" rel=\"noopener\">Double Star Log<\/a>, where he also sees a white primary with a secondary that has a hint of yellow.<\/p>\n<p>One suggestion I came across in James Mullaney&#8217;s book is to stop down the aperture of the scope to 3 or 4 inches to see if that helps increase the strength of the star colors. I&#8217;ll be paying a visit to the fabric store to grab one of those embroidery circles to set up an aperture mask and give this a shot.<\/p>\n<table width=\"470\" border=\"1\" cellspacing=\"0\" cellpadding-left=\"4\">\n<tr>\n<td><b>Subject<\/b><\/td>\n<td>Kappa Bootis (STF STF 1821)<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Double Star<\/td>\n<\/tr>\n<tr>\n<td><b>Position (J2000)<\/b><\/td>\n<td>[RA: 14:13:27.8 \/ Dec: +51:47:16]*<\/td>\n<\/tr>\n<tr>\n<td><b>Position Angle*<\/b><\/td>\n<td>236\u00c2\u00b0 (1973)<\/td>\n<\/tr>\n<tr>\n<td><b>Separation*<\/b><\/td>\n<td>13.4&#8243; (1973)<\/td>\n<\/tr>\n<tr>\n<td><b>Magnitudes*<\/b><\/td>\n<td>4.54\/6.69<\/td>\n<\/tr>\n<tr>\n<td><b>Spectral Types*<\/b><\/td>\n<td>A7V \/ F1V<\/td>\n<\/tr>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>SEP 25, 2006 &#8211; 8:10 PM MST (SEP 26, 2006 &#8211; 03:10 UT)<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Flagstaff, AZ &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>Orion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>10 mm + 2X Barlow (240X)<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Partly cloudy, calm<\/p>\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>NELM Mag 5.8<\/td>\n<\/tr>\n<tr>\n<td><b>References<\/b><\/td>\n<td>The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996) and Catalogue of Stellar Spectral Classifications (Skiff, 2005) via <a href=\"http:\/\/vizier.u-strasbg.fr\/viz-bin\/VizieR\" target=\"_blank\" rel=\"noopener\">VizieR<\/a><\/td>\n<\/tr>\n<\/table>\n<p>*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kappa Bootis<\/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-290","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":402,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/04\/29\/delta_geminorum_2\/","url_meta":{"origin":290,"position":0},"title":"Delta Geminorum (Struve 1066)","author":"jperez1690","date":"April 29, 2008","format":false,"excerpt":"Delta Geminorum","rel":"","context":"In &quot;Double Star&quot;","block_context":{"text":"Double 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