{"id":451,"date":"2008-12-26T23:43:22","date_gmt":"2008-12-26T23:43:22","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2008\/12\/26\/12_lyncis_struv\/"},"modified":"2008-12-26T23:43:22","modified_gmt":"2008-12-26T23:43:22","slug":"12_lyncis_struv","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2008\/12\/26\/12_lyncis_struv\/","title":{"rendered":"12 Lyncis (Struve 948)"},"content":{"rendered":"
<\/a><\/p>\n

Sketch of 12 Lyncis (Struve 948)<\/p>\n<\/div>\n

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

12 Lyncis was a great triple star system. Color contrast was very nice–the primary appeared pale yellow, with a pale blue secondary hugging it. The tertiary appeared to be dull orange. They made for a very striking sight at 120X and 240X.<\/p>\n

I measured the A-B pair at 63 degrees with a separation of 1.5 arc seconds (based on diffraction rings) to 2.2 arc seconds (based on the astrometric eyepiece gauge). I figured I had severely misread or mislabeled the PA measurement in my notes after looking up the WDS value: 156 degrees. However, that was an 1828 value. A little more checking showed that this is actually a fast moving pair. A 1998 measurement showed 72.7 degrees, and Brian Workman’s calculator comes up with 66.13 degrees for 2008.3. Currently the A-B pair is orbiting clockwise at about .5 degrees per year. Not as fast as Porrima’s periastron motion over the last few years, but still notable. My A-C measurement of 310 degrees and 8.6 arc-seconds matched up nicely with more stable values from WDS, Alzner 1998 & others.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\n12 Lyncis (STF 948)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nMultiple Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\nLynx [RA: 6:46:14.3 \/ Dec: +59:26:30]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\n\nA-B:
\n63° [2008.3 my measurement];
\n66.13° [2008.3 Workman Calculator];
\n72.7° [1998 Alzner];
\n156° [1828 WDS]<\/p>\n

A-C:
\n310° [2008.3 my measurement];
\n308.7° [1998 Alzner];
\n308° [1831 WDS]<\/p>\n

Separation*<\/b><\/td>\n\nA-B:
\n1.5″ – 2.2″ [2008.3 my measurement];
\n1.7″ [2008.3 Workman Calculator];
\n1.73″ [1998 Alzner];
\n1.5″ [1828 WDS]<\/p>\n

A-C:
\n8.6″ [2008.3 my measurement];
\n8.72″ [1998 Alzner];
\n8.7″ [1831 WDS]<\/td>\n<\/tr>\n

Magnitudes*<\/b><\/td>\nA: 5.3; B: 6.2; C: 7.2<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nA: A2.5V; B: A2V; C: kA6hF1mF1<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nAPR 12, 2008 – 10:05 PM MST (APR 13, 2008 – 05:05 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nFlagstaff, Arizona, USA – Home<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion Skyview Pro 6LT (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n10 mm Sirius Pl\u00f6ssl + 2X Barlow (240X)
12 mm Meade Astrometric EP + 2X Barlow (200X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, first quarter moon<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n6\/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, Double stars measurements (Alzner 1998), Visual Double Stars in Hipparcos (Dommanget+, 2000), Catalogue of Stellar Spectral Classifications (Skiff, 2008)<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

12 Lyncis<\/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":[56,57,112,15],"tags":[],"class_list":["post-451","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-lynx","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":433,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/09\/21\/38_lyncis_struv\/","url_meta":{"origin":451,"position":0},"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":452,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/12\/31\/19_lyncis_struv\/","url_meta":{"origin":451,"position":1},"title":"19 Lyncis (Struve 1062)","author":"jperez1690","date":"December 31, 2008","format":false,"excerpt":"19 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":507,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/12\/01\/struve_1369\/","url_meta":{"origin":451,"position":2},"title":"Struve 1369","author":"jperez1690","date":"December 1, 2009","format":false,"excerpt":"Struve 1369","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":510,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/12\/05\/xi_scorpius_str\/","url_meta":{"origin":451,"position":3},"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":451,"position":4},"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":420,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/07\/20\/struve_2306\/","url_meta":{"origin":451,"position":5},"title":"Struve 2306","author":"jperez1690","date":"July 20, 2008","format":false,"excerpt":"Struve 2306","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\/451","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=451"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/451\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}