{"id":336,"date":"2007-07-12T23:35:19","date_gmt":"2007-07-12T23:35:19","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2007\/07\/12\/mu_bootis\/"},"modified":"2007-07-12T23:35:19","modified_gmt":"2007-07-12T23:35:19","slug":"mu_bootis","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/12\/mu_bootis\/","title":{"rendered":"Mu Bootis (Struve 28 \/ 1938)"},"content":{"rendered":"

<\/a>
Click image for larger version.<\/i><\/p>\n

Observation Notes:<\/b><\/p>\n

I wasn’t prepared for what a pleasant surprise this ‘double’ star was at high magnification when the B star turned out to be a close double itself. The yellow primary appeared to be separated from the BC combo by about 120 arcseconds. The actual value is 108.4. I estimated the main PA at about 164\u00c2\u00b0, with an actual value of 171\u00c2\u00b0.<\/p>\n

The BC combo appeared purplish-blue, and were close enough that their first diffraction rings intersected each other, but did not intersect the diffraction discs. This works out to a separation of about 2.2 arcseconds. Their PA appeared to be from 0 to 10\u00c2\u00b0. When I first checked the WDS Catalog, I was momentarily frustrated to see 1.3 arcseconds and 327 degrees. But then I realized that was a measurement from 1826 on a very close pair. It turns out their orbital period is 246 years. The actual 2007.3 values calculated from Brian Workman’s calculator are 2.25 arcseconds and 6.2\u00c2\u00b0.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nMu Bo\u00c3\u00b6tis (A-BC: STF 28 \/ BC: STF 1938)<\/b><\/td>\n<\/tr>\n
Classification<\/b><\/td>\nMultiple Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\nBo\u00c3\u00b6tes [RA: 15:24:29.3 \/ Dec: +37:22:38]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\nA-BC: 171\u00c2\u00b0 (1834); BC: 6.2\u00c2\u00b0 (2007.3)<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nA-BC: 108.4″ (1834); BC: 2.25″ (2007.3)<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\nA: 4.3 \/ B: 7.2 \/ C: 7.8 \/ BC: 6.5<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nA: F0V \/ BC: G0V<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nAPR 29, 2007 – 12:40 AM MST (APR 29, 2007 – 07:40 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nFlagstaff, AZ (Home)<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n10 mm + 2X Barlow (240X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nMostly clear, slightly breezy, nearly full moon<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n5-6\/10 Pickering<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag ~5.0<\/td>\n<\/tr>\n
References<\/b><\/td>\nThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Catalogue of Stellar Spectral Classifications (Skiff, 2005)<\/td>\n<\/tr>\n<\/table>\n

*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"

Mu 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-336","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":337,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/13\/zeta_coronae_bo\/","url_meta":{"origin":336,"position":0},"title":"Zeta Coronae Borealis (Struve 1965)","author":"jperez1690","date":"July 13, 2007","format":false,"excerpt":"Zeta Coronae Borealis","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"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":336,"position":1},"title":"Gamma Leonis (Algieba \/ Struve 1424)","author":"jperez1690","date":"December 2, 2006","format":false,"excerpt":"Gamma Leonis","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":338,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/07\/14\/sigma_coronae_b\/","url_meta":{"origin":336,"position":2},"title":"Sigma Coronae Borealis (Struve 2032)","author":"jperez1690","date":"July 14, 2007","format":false,"excerpt":"Sigma Coronae Borealis","rel":"","context":"In "Double Star"","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":336,"position":3},"title":"Alpha Scorpii (Antares \/ GNT 1)","author":"jperez1690","date":"July 15, 2007","format":false,"excerpt":"Alpha Scorpii","rel":"","context":"In "Double Star"","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":336,"position":4},"title":"54 Leonis (Struve 1487)","author":"jperez1690","date":"December 2, 2006","format":false,"excerpt":"54 Leonis","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":306,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/12\/03\/xi_ursae_majori\/","url_meta":{"origin":336,"position":5},"title":"Xi Ursae Majoris (Struve 1523)","author":"jperez1690","date":"December 3, 2006","format":false,"excerpt":"Xi Ursae Majoris","rel":"","context":"In "Double Star"","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\/336","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=336"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/336\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}