Omicron Sagittarii

ο Sagittarii
Description de cette image, également commentée ci-après
Position de ο Sagittarii dans le Sagittaire
(imagée dans Celestia)
Données d'observation
(époque J2000.0)
Ascension droite 19h 04m 40,98s[1]
Déclinaison −21° 44′ 29,4″[1]
Constellation Sagittaire
Magnitude apparente +3,76

Localisation dans la constellation : Sagittaire

(Voir situation dans la constellation : Sagittaire)
Caractéristiques
Type spectral G9IIIb[2]
Indice U-B 0,85
Indice B-V 1,01
Astrométrie
Vitesse radiale 26,10 km/s
Mouvement propre μα = 76,35 ± 0,31 mas/a[1]
μδ = −58,12 ± 0,18 mas/a[1]
Parallaxe 22,96 ± 0,24 mas[1]
Distance 142 ± 1 al
(43,6 ± 0,5 pc)
Magnitude absolue 0,61

Désignations

Manubrij, ο Sgr, 39 Sagittarii, BD-21°5237, GC 26224, HD 177241, HIP 93683, HR 7217, SAO 187643, ADS 11996, CCDM J19047 -2144A, WDS J19047 -2144A[3]

Omicron Sagittarii (ο Sagittarii / ο Sgr) est une étoile de la constellation du Sagittaire. ο Sagittarii est à 142 années-lumière de la Terre[1] et est une géante orange de type spectral G9IIIb[2] avec une magnitude apparente de +3,77.

Comme elle est proche de l'écliptique, ο Sagittarii peut être occultée par la Lune et très rarement par les planètes. La dernière occultation de ο Sagittarii par une planète eut lieu le , lorsqu'elle fut occultée par Mercure.

Elle possède une faible compagne de 13e magnitude, ο Sagittarii B, distante de 36 secondes d'arc. Il s'agit d'une double optique[4].

Noms traditionnels et étymologie

Références

  1. a b c d e et f (en) van Leeuwen, F., « HIP 93683 », Hipparcos, the New Reduction, (consulté le )
  2. a et b (en) Philip C. Keenan et Raymond C. McNeil, « The Perkins catalog of revised MK types for the cooler stars », The Astrophysical Journal Supplement Series, vol. 71,‎ , p. 245 (DOI 10.1086/191373, Bibcode 1989ApJS...71..245K)
  3. (en) * omi Sgr -- High proper-motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  4. (en) P. P. Eggleton et A. A. Tokovinin, « A catalogue of multiplicity among bright stellar systems », Monthly Notices of the Royal Astronomical Society, vol. 389, no 2,‎ , p. 869–879 (DOI 10.1111/j.1365-2966.2008.13596.x, Bibcode 2008MNRAS.389..869E, arXiv 0806.2878)
  5. MANUBRIUM
  6. (zh) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日

Liens externes

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