- Omicron2 Canis Majoris
-
ο² Canis Majoris Observation data
Epoch J2000 Equinox J2000Constellation Canis Major Right ascension 07h 03m 01.5s Declination −23° 49′ 60″ Apparent magnitude (V) 3.00 Characteristics Spectral type B3Ia U−B color index −0.80 B−V color index −0.06 Variable type α Cyg Astrometry Radial velocity (Rv) 48.4 km/s Proper motion (μ) RA: −1.56 mas/yr
Dec.: 4.28 mas/yrParallax (π) 1.27 ± 0.56 mas Distance approx. 3000 ly
(approx. 800 pc)Absolute magnitude (MV) −6.46 Details Mass 20 M☉ Luminosity 1.1 × 105 L☉ Temperature 14,700 K Rotational velocity (v sin i) 44 km/s Age 8 × 106 years Other designations Database references SIMBAD data Omicron2 Canis Majoris (ο² CMa, ο² Canis Majoris) is a star in the constellation Canis Major. It is one of the most luminous stars known, a supergiant that has used up the hydrogen fuel in its core and has entered the evolutionary stage where it is fusing helium atoms to form carbon. When it has used up its fuel, it is likely to become a supernova.
ο² Canis Majoris is classified as an Alpha Cygni-type variable star and its brightness varies from magnitude +2.98 to +3.04.
The star ο1 Canis Majoris lies nearly along the line of sight with this star, but the two do not form a gravitational pair. However, they are within a hundred light years of each other and probably formed in the same area of space.
Name
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Thanih al Adzari (تاني ألعذاري - taanii al-aðārii), which was translated into Latin as Secunda Virginum, meaning the second virgin.[1] This star, along with ε CMa (Adhara), δ CMa (Wezen) and η CMa (Aludra), were Al ʽAdhārā (ألعذاري), the Virgins.[2][3]
External links
- Omicron-2 Canis Majoris on Dr. James Kaler's Stars site.
References
- ^ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society 55: 429. Bibcode 1895MNRAS..55..429K.
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 130. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Canis_Major*.html. Retrieved 2010-12-12.
- ^ ε CMa as Aoul al Adzari or Prima Virginum (the first virgin), ο2 CMa as Thanih al Adzari or Secunda Virginum (the second virgin) and δ CMa as Thalath al Adzari or Tertia Virginum (the third virgin). η CMa should be Rabah al Adzari or Quarta Virginum (the fourth virgin) consistently, but it was given by the name Aludra, meaning the virgin (same meaning with Adhara (ε CMa) or Al ʽAdhārā)
Stars of Canis Major Bayer - α (Sirius)
- β (Mirzam)
- γ (Muliphein)
- δ (Wezen)
- ε (Adhara)
- ζ (Furud)
- η (Aludra)
- θ
- ι
- κ
- λ
- μ
- ν¹
- ν²
- ν³
- ξ¹
- ξ²
- ο¹
- ο²
- π
- σ
- τ
- ω
Flamsteed Nearby Other Categories:- Canis Major constellation
- Alpha Cygni variables
- Bayer objects
- B-type supergiants
- Variable star stubs
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