Epsilon Corvi

ε Corvi
Location of ε Corvi (circled)
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]
Distance318 ± 5 ly
(97 ± 2 pc)
Absolute magnitude (MV)−1.82+0.15
−0.14[5]
Details
Mass3.2[6] M☉
Radius52[7] R☉
Surface gravity (log g)2.16[8] cgs
Temperature4320[8] K
Metallicity [Fe/H]–0.13[8] dex
Rotational velocity (v sin i)1.0[6] km/s
Other designations
2 Crv, BD−21° 3487, FK5 453, HD 105707, HIP 59316, HR 4630, SAO 180531.[9]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aaass22_9 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference aj135_3_892 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference aaa439_1_227 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference ajss74_1075 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Al-Sufi, Book Of Fixed Stars, Constellation: The Crow
  11. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  12. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. ^ Cite error: The named reference aaa431_773 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  15. ^ Kaler, James B. (Jim), "Minkar", Stars, University of Illinois, retrieved 12 July 2015