{"id":420,"date":"2008-07-20T02:47:08","date_gmt":"2008-07-20T02:47:08","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2008\/07\/20\/struve_2306\/"},"modified":"2008-07-20T02:47:08","modified_gmt":"2008-07-20T02:47:08","slug":"struve_2306","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2008\/07\/20\/struve_2306\/","title":{"rendered":"Struve 2306"},"content":{"rendered":"

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

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

Nestled in the rich star fields between the Eagle and Swan Nebulae lies a fascinating multiple star. Struve 2306 was surprisingly colorful for a trio of 8th and 9th magnitude stars. The primary was a strong yellow with a rich blue companion to the southwest. At high power this companion coalesced into a close double itself during moments of good seeing. I measured the A-BC separation at 9.5 arc seconds with a position angle of 221 degrees. This agrees with a 1999 2MASS measurement of 9.57 arc seconds and 221.6 degrees. Measuring the BC pair was very difficult, and I came up with .8 arc seconds and 58 degrees which compares with a 1959 measurement of 1.2 arc seconds and 70 degrees.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nSTF 2306<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nMultiple Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\nScutum [RA: 18:22:14 \/ Dec: -15:05:17]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\n\nAB: 221° [2008.5 my measurement]; 221.6° [1999.3 TMA2003 (2MASS Catalog)]
\nBC: 58° [2008.5 my measurement]; 70° [1959 Visual Double Stars in Hipparcos (Dommanget+, 2000)]<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nAB: 9.5″ [2008.5 my measurement]; 9.57″ [1999.3 TMA2003 (2MASS Catalog)]
BC: .8″ [2008.5 my estimate]; 1.2″ [1959 Visual Double Stars in Hipparcos (Dommanget+, 2000)]<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\nA: 8.08; B: 8.61; C: 9.00<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nA: K5+II; BC: F5III<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nJUL 3, 2008 – 3:30 AM MST (JUL 3, 2008 – 10:30 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nAnderson Mesa, Arizona<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion XT8 (203 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n10 mm Sirius Pl\u00c3\u00b6ssl + 2X Barlow (240X)
12 mm Meade Astrometric EP + 2X Barlow (200X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nPartly cloudy, calm<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n6\/10 Pickering<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag 6.8<\/td>\n<\/tr>\n
*References<\/b><\/td>\nThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); CCDM (Catalog of Components of Double & Multiple stars (Dommanget+ 2002); Visual Double Stars in Hipparcos (Dommanget+, 2000); Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002); Catalogue of Stellar Spectral Classifications (Skiff, 2007)<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Struve 2306<\/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":[56,57,38,15],"tags":[],"class_list":["post-420","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-scutum","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":510,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/12\/05\/xi_scorpius_str\/","url_meta":{"origin":420,"position":0},"title":"Xi Scorpii (Struve 1998) and Struve 1999","author":"jperez1690","date":"December 5, 2009","format":false,"excerpt":"Xi Scorpii","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":464,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/04\/05\/delta_serpentis\/","url_meta":{"origin":420,"position":1},"title":"Delta Serpentis (Struve 1954)","author":"jperez1690","date":"April 5, 2009","format":false,"excerpt":"Delta Serpentis","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":451,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/12\/26\/12_lyncis_struv\/","url_meta":{"origin":420,"position":2},"title":"12 Lyncis (Struve 948)","author":"jperez1690","date":"December 26, 2008","format":false,"excerpt":"12 Lyncis","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":397,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/03\/25\/alpha_geminorum\/","url_meta":{"origin":420,"position":3},"title":"Alpha Geminorum (Castor \/ Struve 1110)","author":"jperez1690","date":"March 25, 2008","format":false,"excerpt":"Alpha Geminorum (Castor \/ Struve 1110)","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":433,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/09\/21\/38_lyncis_struv\/","url_meta":{"origin":420,"position":4},"title":"38 Lyncis (Struve 1334)","author":"jperez1690","date":"September 21, 2008","format":false,"excerpt":"38 Lyncis","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":364,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/09\/25\/alpha_piscium_s\/","url_meta":{"origin":420,"position":5},"title":"Alpha Piscium (Struve 202)","author":"jperez1690","date":"September 25, 2007","format":false,"excerpt":"Alpha Piscium","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\/420","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=420"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/420\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}