Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Canis Major |
Right ascension | 07h 01m 43.14779s[1] |
Declination | −27° 56′ 05.3898″[1] |
Apparent magnitude (V) | 3.43 - 3.51[2] |
Characteristics | |
Spectral type | K5 Ib[3] |
U−B color index | +1.88[4] |
B−V color index | +1.73[4] |
Variable type | LC[2] |
Astrometry | |
Radial velocity (Rv) | +22.11[5] km/s |
Proper motion (μ) | RA: −3.047[6] mas/yr Dec.: +4.08[6] mas/yr |
Parallax (π) | 2.5085 ± 0.1590 mas[7] |
Distance | 1290+76 −80 ly (395.6+23.2 −24.4 pc)[8] |
Absolute magnitude (MV) | −5.14[9] |
Details | |
Mass | 5.61+0.51 −0.49,[10] 8.4±1.0, 9.1±2.0[11] M☉ |
Radius | 297[12] R☉ |
Luminosity | 15,800[12] L☉ |
Surface gravity (log g) | 0.32[10] cgs |
Temperature | 3792±125[11] K |
Metallicity [Fe/H] | +0.16[13] dex |
Age | 83.2[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Sigma Canis Majoris (σ Canis Majoris, abbreviated Sigma CMa, σ CMa), also named Unurgunite /ˌʌnərˈɡʌnaɪt/,[15] 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.
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