{"id":302,"date":"2006-11-29T22:18:44","date_gmt":"2006-11-29T22:18:44","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/11\/29\/epsilon_hydrae\/"},"modified":"2006-11-29T22:18:44","modified_gmt":"2006-11-29T22:18:44","slug":"epsilon_hydrae","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/11\/29\/epsilon_hydrae\/","title":{"rendered":"Epsilon Hydrae (Struve 1273)"},"content":{"rendered":"


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

This was a great double to observe. The primary is a bright, third magnitude pale yellow star with a much fainter seventh magnitude, blue-gray companion resting right up against it. When the seeing was choppy, this secondary disappeared into the overpowering wash of yellow. I thought it looked a bit like a little bluebottle fly sitting on the edge of a fluttering sunflower.<\/p>\n

PA appeared to be about 315\u00c2\u00b0. The first diffraction rings seemed to be barely in contact, which indicated a separation of 2.5 to 3 arcseconds. According to the Washington Double Star Catalog, the primary is itself comprised of 2 stars of magnitudes 3.8 and 5.3. The period of the very close AB pair is 15.05 years, and the AB-C period is 890 years. <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nEpsilon Hydrae (STF 1273)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nDouble Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\n[RA: 08:46:46.1 \/ Dec: +06:25:09]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\nAB-C=195\u00c2\u00b0 (1825)
AB-C=271\u00c2\u00b0 (1959)
AB-C=292\u00c2\u00b0 (1994)<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\nAB-C=3.2″ (1825)
AB-C=3.1″ (1959)
AB-C=3.0″ (1994)<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\nA=3.8; B=5.3; AB=3.6; B=7.8<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\n–<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nOCT 22, 2006 – 3:55 AM MST (OCT 22, 2006 – 10:55 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nCinder Hills Overlook, Sunset Crater National Monument, AZ<\/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 6.8+<\/td>\n<\/tr>\n
References<\/b><\/td>\nThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996), Visual Double Stars in Hipparcos (Dommanget+, 2000) via VizieR<\/a><\/td>\n<\/tr>\n<\/table>\n

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

Epsilon Hydrae<\/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":[56,57,70,15],"tags":[],"class_list":["post-302","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-hydra","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":14,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/01\/double_star_ske\/","url_meta":{"origin":302,"position":0},"title":"Double Star Sketches","author":"jperez1690","date":"August 1, 2004","format":false,"excerpt":"Double Star Sketches","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":404,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/05\/01\/v_hydrae_burnha\/","url_meta":{"origin":302,"position":1},"title":"V Hydrae (Burnham 1428)","author":"jperez1690","date":"May 1, 2008","format":false,"excerpt":"V Hydrae (Burnham 1428)","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":325,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/04\/25\/tau1_hydrae_hj\/","url_meta":{"origin":302,"position":2},"title":"Tau-1 Hydrae (HJ 1167)","author":"jperez1690","date":"April 25, 2007","format":false,"excerpt":"Tau1 Hydrae","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":316,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/02\/04\/n_hydrae\/","url_meta":{"origin":302,"position":3},"title":"N Hydrae","author":"jperez1690","date":"February 4, 2007","format":false,"excerpt":"N Hydrae","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":497,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/10\/09\/epsilon_monocer\/","url_meta":{"origin":302,"position":4},"title":"Epsilon Monocerotis (Struve 900)","author":"jperez1690","date":"October 9, 2009","format":false,"excerpt":"Epsilon Monocerotis","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":405,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/05\/01\/c2007_w1_boatti\/","url_meta":{"origin":302,"position":5},"title":"C\/2007 W1 (Boattini) – MAY 01, 2008","author":"jperez1690","date":"May 1, 2008","format":false,"excerpt":"C\/2007 W1 (Boattini) 20080501","rel":"","context":"In "Comet"","block_context":{"text":"Comet","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/comet\/"},"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\/302","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=302"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/302\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}