Epsilon Corvi

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Epsilon Corvi
Diagram showing star positions and boundaries of the Corvus constellation and its surroundings
Cercle rouge 100%.svg

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[1] mas
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
2 Crv, FK5 453, HD 105707, HIP 59316, HR 4630, SAO 180531.[9]

Epsilon Corvi (ε Crv, ε Corvi) is a star in the southern constellation of Corvus. It has the traditional name Minkar, from Arabic المنخر al-mánxar meaning "the nostril 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]

References

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  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.. The radius (R*) is given by:
    \begin{align} 2\cdot R_* & = \frac{(10^{-3}\cdot 97\cdot 4.99)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 104\cdot R_{\bigodot} \end{align}
  8. ↑ 8.0 8.1 8.2 8.3 Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Constellations of Words - Corvi (Minkar)
  11. ↑ (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. ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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