{"id":325,"date":"2007-04-25T22:51:47","date_gmt":"2007-04-25T22:51:47","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2007\/04\/25\/tau1_hydrae_hj\/"},"modified":"2007-04-25T22:51:47","modified_gmt":"2007-04-25T22:51:47","slug":"tau1_hydrae_hj","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2007\/04\/25\/tau1_hydrae_hj\/","title":{"rendered":"Tau-1 Hydrae (HJ 1167)"},"content":{"rendered":"

<\/p>\n

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

This double star presented an interesting color contrast compared to the actual spectra. The primary appeared pale yellow, with a fainter blue-gray companion. The primary is F6V, which is believable, but according to the 13th General Catalogue of MK Spectral Classification (Buscombe 1998), the secondary is a K0V star, which should appear yellow-orange if anything. Eric Graff<\/a> noted White and Yellowish for the pair while using a 150 mm f\/6 newtonian at 120X. Alain Gerard<\/a> recorded pale yellow and yellow-orange. However, as with my observation, Jeff Burton<\/a> noted pale yellow and blue while using a 203 mm SCT at 111X.<\/p>\n

I estimated PA at 10 degrees and separation appeared to be 1\/7 of the field of view, or about 100 arcseconds. The actual values are 4.1 degrees and 65.7 arcseconds.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nTau1<\/sup> Hydrae (HJ 1167)<\/b><\/td>\n<\/tr>\n
Classification<\/b><\/td>\nDouble Star<\/td>\n<\/tr>\n
Position (J2000)<\/b><\/td>\nHydra [RA: 09:29:09 \/ Dec: -02:46:08]*<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\n4.1\u00c2\u00b0 (1991)<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\n65.7″ (1991)<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\n4.6 \/ 7.8<\/td>\n<\/tr>\n
Spectral Types*<\/b><\/td>\nF6V \/ K0V<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nMAR 15, 2007 – 11:50 PM MST (MAR 16, 2007 – 06:50 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>\nMostly clear, calm<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n4\/10 Pickering<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag ~6.0<\/td>\n<\/tr>\n
References<\/b><\/td>\nThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002); 13th General Catalogue of MK Spectral Classification (Buscombe 1998) <\/td>\n<\/tr>\n<\/table>\n

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

Tau1 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-325","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":316,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/02\/04\/n_hydrae\/","url_meta":{"origin":325,"position":0},"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":302,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/11\/29\/epsilon_hydrae\/","url_meta":{"origin":325,"position":1},"title":"Epsilon Hydrae (Struve 1273)","author":"jperez1690","date":"November 29, 2006","format":false,"excerpt":"Epsilon 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":404,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/05\/01\/v_hydrae_burnha\/","url_meta":{"origin":325,"position":2},"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":14,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/01\/double_star_ske\/","url_meta":{"origin":325,"position":3},"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":290,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/25\/kappa_bootis_st\/","url_meta":{"origin":325,"position":4},"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":505,"url":"https:\/\/perezmedia.net\/beltofvenus\/2009\/11\/14\/beta_monoceroti\/","url_meta":{"origin":325,"position":5},"title":"Beta Monocerotis (Struve 919)","author":"jperez1690","date":"November 14, 2009","format":false,"excerpt":"Beta 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":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/325","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=325"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/325\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}