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Red giant star in the constellation Corvus From Wikipedia, the free encyclopedia
Epsilon Corvi (ε Crv, ε Corvi) is a star in the southern constellation of Corvus. It has the traditional name Minkar /ˈmɪŋkɑːr/, from Arabic منقار minqar meaning "beak [of the crow]"[10] The apparent visual magnitude is +3.0[2] and it is located at a distance of 318 light-years (97 parsecs) from Earth.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corvus |
Right ascension | 12h 10m 07.48058s[1] |
Declination | –22° 37′ 11.1620″[1] |
Apparent magnitude (V) | +3.024[2] |
Characteristics | |
Spectral type | K2 III[3] |
U−B color index | +1.458[2] |
B−V color index | +1.318[2] |
Astrometry | |
Radial velocity (Rv) | +4.9[4] km/s |
Proper motion (μ) | RA: –71.74 mas/yr Dec.: +10.25 mas/yr |
Parallax (π) | 10.26 ± 0.16 mas[1] |
Distance | 318 ± 5 ly (97 ± 2 pc) |
Absolute magnitude (MV) | −1.82+0.15 −0.14[5] |
Details | |
Mass | 3.2[6] M☉ |
Radius | 52[7] R☉ |
Surface gravity (log g) | 2.16[8] cgs |
Temperature | 4320[8] K |
Metallicity [Fe/H] | –0.13[8] dex |
Rotational velocity (v sin i) | 1.0[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
In Chinese, 軫宿 (Zhěn Sù), meaning Chariot (asterism), refers to an asterism consisting of ε Corvi, γ Corvi, δ Corvi and β Corvi.[11] Consequently, ε Corvi itself is known as 軫宿二 (Zhěn Sù èr, English: the Second Star of Chariot.).[12]
Epsilon Corvi is a red giant with a stellar classification of K2 III, having consumed the hydrogen at its core and evolved away from the main sequence. It has about three times the Sun's mass.[6] The interferometry-measured angular diameter of this star is about 4.99 mas,[13] which, at its estimated distance, equates to a physical radius of about 52 times the radius of the Sun.[7] The effective temperature of the outer envelope is 4320 K,[8] giving it an orange hue that is characteristic of a K-type star.[14] Around 4 times as massive as the Sun, it spent much of its life as a main sequence star of spectral type B5V.[15]