{"id":285,"date":"2006-09-04T01:20:00","date_gmt":"2006-09-04T01:20:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/09\/04\/beta_lyrae_stru\/"},"modified":"2006-09-04T01:20:00","modified_gmt":"2006-09-04T01:20:00","slug":"beta_lyrae_stru","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/04\/beta_lyrae_stru\/","title":{"rendered":"Beta Lyrae (Struve 39 and Burnham 293)"},"content":{"rendered":"

<\/p>\n

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

Although I was originally looking for a double here, there are two additional stars to the north of the primary that are included as part of Burnham 293. The primary, for some reason, appeared brilliant green in color–emerald green in fact. The secondary to the south was blue. I didn’t pick up color in the other two stars. <\/p>\n

I am becoming more and more concerned about seeing green in some of these primary stars. I’m pretty sure the traditional scenario for green stars is A) A very close pair, B) An orange or red primary, and C) A secondary that is blue. I seem to be picking up green in primaries of wide pairs, without a red or orange companion, and on at least one occasion the green appeared on a yellow star. I’m picking up these colors while observing doubles from the light polluted realm in front of my house. Perhaps this is affecting me worse than I thought. The green effect on this pair was still startlingly beautiful.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nBeta Lyrae (STF 39 and BU 293)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nMultiple Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\n[RA: 18:50:04.7 \/ Dec: +33:21:45]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\nAB=149\u00c2\u00b0 (1835); AE=318\u00c2\u00b0 (1879); AF=19\u00c2\u00b0 (1879)<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nAB=45.7″ (1835); AE=66.9″ (1879); AF=85.8″ (1879)<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\nA=3.4; B=8.6; E=9.9; F=9.9<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nA=B9; B=B7; E=A5; F=A7<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nSEP 04, 2006 – 1:10 AM MST (SEP 04, 2006 – 08:20 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>\nClear, calm<\/p>\n
Seeing<\/b><\/td>\n5\/10<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag ~4.0<\/td>\n<\/tr>\n
References<\/b><\/td>\nThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996) and Catalogue of Stellar Spectral Classifications (Skiff, 2005) via VizieR<\/a><\/td>\n<\/tr>\n<\/table>\n

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

Beta Lyrae<\/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":[56,57,71,15],"tags":[],"class_list":["post-285","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-lyra","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":141,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/08\/01\/doublemultiple_12\/","url_meta":{"origin":285,"position":0},"title":"Eta Cassiopeiae (Struve 60)","author":"jperez1690","date":"August 1, 2005","format":false,"excerpt":"Eta Cassiopeiae","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":257,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/07\/20\/double_star_ske_1\/","url_meta":{"origin":285,"position":1},"title":"Double Star Sketches in Sky and Telescope","author":"jperez1690","date":"July 20, 2006","format":false,"excerpt":"If you subscribe to Sky and Telescope, keep your eyes open for the article More of My Favorite Double Stars by James Mullaney in the September 2006 issue. I was invited to submit a few double star sketches to help illustrate the article. The author lists a couple dozen autumn\u2026","rel":"","context":"In "General"","block_context":{"text":"General","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/general\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":290,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/25\/kappa_bootis_st\/","url_meta":{"origin":285,"position":2},"title":"Kappa Boötis (Struve 1821)","author":"jperez1690","date":"September 25, 2006","format":false,"excerpt":"Kappa Bootis","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":534,"url":"https:\/\/perezmedia.net\/beltofvenus\/2010\/05\/09\/2_comae_berenic\/","url_meta":{"origin":285,"position":3},"title":"2 Comae Berenices (Struve 1596)","author":"jperez1690","date":"May 9, 2010","format":false,"excerpt":"02 COM","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":254,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/06\/13\/61_cygni\/","url_meta":{"origin":285,"position":4},"title":"61 Cygni (Struve 2758)","author":"jperez1690","date":"June 13, 2006","format":false,"excerpt":"61 Cygni","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":328,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/04\/30\/gamma_velorum_d\/","url_meta":{"origin":285,"position":5},"title":"Gamma Velorum (Dunlop 65)","author":"jperez1690","date":"April 30, 2007","format":false,"excerpt":"Gamma Velorum","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\/285","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=285"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/285\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=285"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=285"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}