Sigma Hydrae
Star in the constellation Hydra / From Wikipedia, the free encyclopedia
Sigma Hydrae (σ Hydrae, abbreviated Sigma Hya, σ Hya), also named Minchir /ˈmɪŋkər/,[10] is a solitary[11] star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.48.[2] The estimated distance to this star from the Sun, based upon an annual parallax shift of 8.75 mas,[1] is around 370 light-years. At that distance, the visual magnitude of the star is diminished by an interstellar extinction factor of 0.16,[4] due to intervening dust.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Hydra |
Right ascension | 08h 38m 45.43747s[1] |
Declination | +03° 20′ 29.1701″[1] |
Apparent magnitude (V) | 4.48[2] |
Characteristics | |
Spectral type | K2 III[3] |
U−B color index | +1.23[2] |
B−V color index | +1.21[2] |
Astrometry | |
Radial velocity (Rv) | 27.28±0.19[4] km/s |
Proper motion (μ) | RA: −19.48[1] mas/yr Dec.: −15.92[1] mas/yr |
Parallax (π) | 8.75 ± 0.25 mas[1] |
Distance | 370 ± 10 ly (114 ± 3 pc) |
Absolute magnitude (MV) | −0.84[5] |
Details[6] | |
Mass | 3.07 M☉ |
Radius | 27.6[7] R☉ |
Luminosity | 295 L☉ |
Surface gravity (log g) | 2.21±0.13[8] cgs |
Temperature | 4,491±51 K |
Metallicity [Fe/H] | 0.13±0.06[8] dex |
Age | 430 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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