Sigma Canis Majoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 01m 43.14779s |
| Declination | −27° 56′ 05.3898″ |
| Apparent magnitude (V) | 3.43 - 3.51 |
| Characteristics | |
| Spectral type | K5 Ib |
| U−B color index | +1.88 |
| B−V color index | +1.73 |
| Variable type | LC |
| Astrometry | |
| Radial velocity (Rv) | +22.11 km/s |
| Proper motion (μ) | RA: −3.047 mas/yr Dec.: +4.08 mas/yr |
| Parallax (π) | 2.5085±0.1590 mas |
| Distance | 1290+76 −80 ly (395.6+23.2 −24.4 pc) |
| Absolute magnitude (MV) | −5.14 |
| Details | |
| Mass | 5.61+0.51 −0.49, 8.4±1.0, 9.1±2.0 M☉ |
| Radius | 297 R☉ |
| Luminosity | 15,800 L☉ |
| Surface gravity (log g) | 0.32 cgs |
| Temperature | 3792±125 K |
| Metallicity [Fe/H] | +0.16 dex |
| Age | 83.2 Myr |
| Other designations | |
| Unurgunite, Nganurganity, 22 Canis Majoris, ADS 5719, CD−27°3544, FK5 1183, HD 52877, HIP 33856, HR 2646, SAO 172797 | |
| Database references | |
| SIMBAD | data |
Sigma Canis Majoris (σ Canis Majoris, abbreviated Sigma CMa, σ CMa), also named Unurgunite /ˌʌnərˈɡʌnaɪt/ or Nganurganity [ˈŋanuɾˌɡ̊aniɟ̊], is a variable star in the southern constellation of Canis Major. It is approximately 1,290 light-years (400 parsecs) from the Sun and has an average apparent visual magnitude of +3.41.