Omicron2 Canis Majoris
Variable star in constellation Canis Major / From Wikipedia, the free encyclopedia
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Omicron2 Canis Majoris (ο2 CMa, ο2 Canis Majoris) is a star in the constellation Canis Major. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[3] It has an apparent visual magnitude of 3.043,[2] making it one of the brighter members of the constellation. The distance to this star is roughly 2,800 light years (800 parsecs), with a 34% margin of error.[1]
For other stars with this Bayer designation, see ο Canis Majoris.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Canis Major |
Right ascension | 07h 03m 01.47211s[1] |
Declination | −23° 49′ 59.8523″[1] |
Apparent magnitude (V) | 3.043[2] |
Characteristics | |
Spectral type | B3 Ia[3] |
U−B color index | −0.778[2] |
B−V color index | −0.107[2] |
Variable type | α Cyg[4] |
Astrometry | |
Radial velocity (Rv) | 48.4[5] km/s |
Proper motion (μ) | RA: −2.21[1] mas/yr Dec.: +3.61[1] mas/yr |
Parallax (π) | 1.18 ± 0.40 mas[1] |
Distance | approx. 2,800 ly (approx. 800 pc) |
Absolute magnitude (MV) | −7.3[6] |
Details | |
Mass | 21.4±2.2[7] M☉ |
Radius | 65[6] R☉ |
Luminosity | 220,000[6] L☉ |
Surface gravity (log g) | 2.05[6] cgs |
Temperature | 15,500[6] K |
Rotational velocity (v sin i) | 58[6] km/s |
Age | 7.4±1.0[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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