{"id":173,"date":"2008-05-12T22:15:00","date_gmt":"2008-05-12T22:15:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2008\/05\/12\/beta_capricorni\/"},"modified":"2008-05-12T22:15:00","modified_gmt":"2008-05-12T22:15:00","slug":"beta_capricorni","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2008\/05\/12\/beta_capricorni\/","title":{"rendered":"Beta Capricorni (Struve 52)"},"content":{"rendered":"

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

Observation Notes – May 12, 2008<\/b><\/p>\n

Before submitting the sketch of this double for an upcoming observing article, I noticed an obvious error in the orientation of the entire field. Whenever the alignment of the double is very close to north, south, east or west, any slop in position angle becomes pretty obvious. So I headed out early this morning for another look and put the astrometric eyepiece on it. The corrected PA and separation can be seen in the illustration above, and the info in the table below. I’m convinced that getting up at 4 in the morning is unhealthy, but the strikingly beautiful color in this double made up for it. It’s very wide and definitely appears best at low power. Be sure to look it up with binoculars or a low power eyepiece when Capricornus makes its way into a more agreeable time slot later this summer.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nBeta Capricorni (STF 52)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nMultiple Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\nCapricornus [RA: 20:21:00 \/ Dec: -14:47]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\nA-B: 267°; A-C: 133° [my measurement 2008]
A-B: 267°; A-C: 134° [WDS 1835; 1912]<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nA-B: 198″; A-C: 224″ [my measurement 2008]
A-B: 205.3″; A-C: 226.6″ [WDS 1835; 1912]<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\nA = 3.4; B = 6.2; C = 9.0<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nA = G9II + B8p; B = A2V; C = F8<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nMAY 12, 2008 – 04:15 AM (MAY 12, 2008 – 11:15 UT]<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nFlagstaff, AZ – Home<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion XT8 Dobsonian (203 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n12 mm Meade Astrometric + 2X Barlow (200X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, breezy<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n4\/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, 2007); Visual Double Stars in Hipparcos (Dommanget+, 2000); Starry Night Pro Plus 5.8<\/td>\n<\/tr>\n<\/table>\n

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

<\/p>\n

October 9, 2006: To help provide a consistent style for my double star sketches, the above sketch is a digital update to the original sketch.<\/i><\/p>\n

<\/p>\n

I’m not sure if this is a triple or not. The primary is brilliant yellow-orange. The secondary is deep blue (PA 265\u00c2\u00b0, Sep. 4′). The tertiary (if that’s what it is) is orange (PA 160\u00c2\u00b0, Sep. 5′). All elements were widely spread. The actual listed value of 267\u00c2\u00b0 PA\/206″ (3’26”) sep closely matches the measure to the blue secondary.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Position Angle*<\/b><\/td>\nA-B: 265°; A-C: 160° [my estimate 2005]<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nA-B: 240″; A-C: 300″ [my estimate 2005]<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nSEP 13, 2005 – 12:15 AM MST (SEP 13, 2005 – 07:15 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 Sirius Plossl + 2X Barlow (240X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, breezy, 55°F<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n4\/10 Pickering<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag 4.8<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Beta Capricorni<\/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":[56,57,82,15],"tags":[],"class_list":["post-173","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-capricornus","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":27,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/24\/observing_repor_1\/","url_meta":{"origin":173,"position":0},"title":"Observing Report – 08.24.2004","author":"jperez1690","date":"August 24, 2004","format":false,"excerpt":"20040824_01","rel":"","context":"In "Astro Photography"","block_context":{"text":"Astro Photography","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/astro-photography\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":517,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/12\/25\/jupiter_-_neptu\/","url_meta":{"origin":173,"position":1},"title":"Jupiter – Neptune Conjunction – DEC 24, 2009","author":"jperez1690","date":"December 25, 2009","format":false,"excerpt":"Jupiter-Neptune Conjunction","rel":"","context":"In "Planetary"","block_context":{"text":"Planetary","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/planetary\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":174,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/09\/13\/alpha_capricorn\/","url_meta":{"origin":173,"position":2},"title":"Alpha Capricorni (Struve 51)","author":"jperez1690","date":"September 13, 2005","format":false,"excerpt":"Alpha Capricorni","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":207,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/22\/m18\/","url_meta":{"origin":173,"position":3},"title":"Messier 18","author":"jperez1690","date":"October 22, 2005","format":false,"excerpt":"M018","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":206,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/22\/m24\/","url_meta":{"origin":173,"position":4},"title":"Messier 24","author":"jperez1690","date":"October 22, 2005","format":false,"excerpt":"M024","rel":"","context":"In "Messier"","block_context":{"text":"Messier","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/messier\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":391,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/01\/21\/how_well_does_a\/","url_meta":{"origin":173,"position":5},"title":"How Well Does a Sketch Represent the Eyepiece View?","author":"jperez1690","date":"January 21, 2008","format":false,"excerpt":"One of the great values I attach to astronomical sketches is that they can help convey what an object looks like visually much better than a photograph can. However, there are some caveats I've been wanting to discuss. What you see in a well-executed sketch is not necessarily what the\u2026","rel":"","context":"In "Article"","block_context":{"text":"Article","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/article\/"},"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\/173","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=173"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/173\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}