Back Ómicron2 Canis Majoris AST Òmicron2 Canis Majoris Catalan Ómicron2 Canis Majoris Spanish امیکرون۲ سگ بزرگ Persian Omicron2 Canis Majoris French Omicron2 Canis Majoris Italian おおいぬ座オミクロン2星 Japanese Omikron² Canis Majoris Dutch Omikron2 Canis Majoris Polish Omicron2 Canis Majoris Portuguese

Omicron2 Canis Majoris

For other stars with this Bayer designation, see ο Canis Majoris.
ο2 Canis Majoris
Location of ο2 CMa (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 07h 03m 01.47134s[1]
Declination −23° 49′ 59.8583″[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)53.88±4.04[1] km/s
Proper motion (μ) RA: −1.335 mas/yr[1]
Dec.: +3.803 mas/yr[1]
Parallax (π)0.8715 ± 0.3319 mas[1]
Distance3,590 ly
(1,100 pc)[5][a]
Absolute magnitude (MV)−7.3[5]
Details
Mass21.4±2.2[6] M☉
Radius65[5] R☉
Luminosity220,000[5] L☉
Surface gravity (log g)2.05[5] cgs
Temperature15,500[5] K
Rotational velocity (v sin i)58[5] km/s
Age7.4±1.0[6] Myr
Other designations
24 Canis Majoris, CD−23°4797, FK5 270, HD 53138, HIP 33977, HR 2653, SAO 172839
Database references
SIMBADdata

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. Based upon a distance modulus of 10.2, it is about 3,600 light-years from Earth.[5]

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  2. ^ a b c d Cite error: The named reference sps1966 was invoked but never defined (see the help page).
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  5. ^ a b c d e f g h Cite error: The named reference aaa446_1_279 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).


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