軫宿二

**軫宿二（烏鴉座ε）**
	軫宿二的位置（紅圈）
觀測資料; 曆元 J2000
星座	烏鴉座
星官
赤經	12h 10m 07.48058s[1]
赤緯	–22° 37′ 11.1620″[1]
視星等（V）	+3.024[2]
特性
光谱分类	K2 III[3]
U−B 色指数	+1.458[2]
B−V 色指数	+1.318[2]
天体测定
徑向速度 (Rv)	+4.9[4] km/s
自行 (μ)	赤经：–71.74 mas/yr ; 赤纬：+10.25 mas/yr
视差 (π)	10.26 ± 0.16[1] mas
距离	318 ± 5 ly ; (97 ± 2 pc)
绝对星等 (MV)	−1.82+0.15; −0.14[5]
詳細資料
質量	3.2[6] M☉
半徑	52[7] R☉
表面重力 (log g)	2.16[8]
溫度	4320[8] K
金属量 [Fe/H]	–0.13[8] dex
自轉速度 (v sin i)	1.0[6] km/s
其他命名
	2 Crv、BD−21° 3487、 FK5 453、HD 105707、HIP 59316、HR 4630、SAO 180531[9]。
參考資料庫
SIMBAD	资料

軫（）宿（）二（Epsilon Corvi，ε Crv，ε Corvi）是在南天星座烏鴉座的一顆恆星，它的固有名稱Minkar /ˈmɪŋkɑːr/，源自阿拉伯語的 منقار 「minqar」，意思是「烏鴉的喙」[10]。它的視星等為+3.0[2]，位於距離地球318光年（97秒差距）之處[1]。

在中國，它是軫宿的第二顆星[11][12]。

軫宿二是一顆紅巨星，其恆星分類為K2III。它已經耗盡了核心的氫，在演化上易經遠離主序列。它的質量約為太陽的3倍[6]。以干涉測量術量測得到這顆恆星的角直徑大約為4.99 毫角秒[13]，以其估計的距離，它的真實半徑大約相當於太陽半徑的52倍[7]。表面的有效溫度是7003432000000000000♠4320 K[8]，使其具有K型恆星特有的橙色色調[14]。它的質量大約是太陽的4倍，在其生命的大部分時間裏都是光譜類型為B5V的主序星[15]。

參考資料

van Leeuwen, F., , Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357
Celis S., L., , Astronomy and Astrophysics Supplement Series, October 1975, 22: 9–17, Bibcode:1975A&AS...22....9C
Houk, Nancy, 4, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 1979, Bibcode:1988mcts.book.....H
Wielen, R.; et al, , Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg), 1999, 35 (35): 1, Bibcode:1999VeARI..35....1W
Carney, Bruce W.; et al, , The Astronomical Journal, March 2008, 135 (3): 892–906, Bibcode:2008AJ....135..892C, S2CID 2756572, arXiv:0711.4984 , doi:10.1088/0004-6256/135/3/892
Melo, C. H. F.; et al, , Astronomy and Astrophysics, August 2005, 439 (1): 227–235, Bibcode:2005A&A...439..227M, S2CID 10580797, arXiv:astro-ph/0504133 , doi:10.1051/0004-6361:20041805
Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 97\cdot 4.99)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 104\cdot R_{\bigodot }\end{aligned}}$
McWilliam, Andrew, , Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527 
, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-23]
Al-Sufi, Book Of Fixed Stars, Constellation: The Crow
（中文） 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.
（中文）香港太空館 - 研究資源 - 亮星中英對照表的存檔，存档日期January 30, 2011，., Hong Kong Space Museum. Accessed on line November 23, 2010.
Richichi, A.; Percheron, I.; Khristoforova, M., , Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039 
, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2012-03-18）
Kaler, James B. (Jim), , Stars (University of Illinois), [12 July 2015]

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[aaa474_2_653-1] van Leeuwen, F., , Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357

[aaass22_9-2] Celis S., L., , Astronomy and Astrophysics Supplement Series, October 1975, 22: 9–17, Bibcode:1975A&AS...22....9C

[houk1979-3] Houk, Nancy, 4, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 1979, Bibcode:1988mcts.book.....H

[scfs-4] Wielen, R.; et al, , Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg), 1999, 35 (35): 1, Bibcode:1999VeARI..35....1W

[aj135_3_892-5] Carney, Bruce W.; et al, , The Astronomical Journal, March 2008, 135 (3): 892–906, Bibcode:2008AJ....135..892C, S2CID 2756572, arXiv:0711.4984 , doi:10.1088/0004-6256/135/3/892

[aaa439_1_227-6] Melo, C. H. F.; et al, , Astronomy and Astrophysics, August 2005, 439 (1): 227–235, Bibcode:2005A&A...439..227M, S2CID 10580797, arXiv:astro-ph/0504133 , doi:10.1051/0004-6361:20041805

[lang2006-7] Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 97\cdot 4.99)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 104\cdot R_{\bigodot }\end{aligned}}$

[ajss74_1075-8] McWilliam, Andrew, , Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527 

[SIMBAD-9] , SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-23]

[10] Al-Sufi, Book Of Fixed Stars, Constellation: The Crow

[11] （中文） 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] （中文）香港太空館 - 研究資源 - 亮星中英對照表的存檔，存档日期January 30, 2011，., Hong Kong Space Museum. Accessed on line November 23, 2010.

[aaa431_773-13] Richichi, A.; Percheron, I.; Khristoforova, M., , Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039 

[csiro-14] , Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2012-03-18）

[kalereps-15] Kaler, James B. (Jim), , Stars (University of Illinois), [12 July 2015]