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
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| 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] |
| Distance | 3,590 ly (1,100 pc)[5][a] |
| Absolute magnitude (MV) | −7.3[5] |
| Details | |
| Mass | 21.4±2.2[6] M☉ |
| Radius | 65[5] R☉ |
| Luminosity | 220,000[5] L☉ |
| Surface gravity (log g) | 2.05[5] cgs |
| Temperature | 15,500[5] K |
| Rotational velocity (v sin i) | 58[5] km/s |
| Age | 7.4±1.0[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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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