水位增六

**水位增六（巨蟹座Mu²）**
觀測資料; 曆元 J2000.0
星座	巨蟹座
星官
赤經	08h 07m 45.85574s
赤緯	+21° 34′ 54.5441″
視星等（V）	+5.30
特性
光谱分类	G2 IV
U−B 色指数	+0.21
B−V 色指数	+0.63
天体测定
徑向速度 (Rv)	−36.0±0.1 km/s
自行 (μ)	赤经：+23.00 mas/yr ; 赤纬：−66.42 mas/yr
视差 (π)	42.94 ± 0.30 mas
距离	76.0 ± 0.5 ly ; (23.3 ± 0.2 pc)
绝对星等 (MV)	+3.46
詳細資料
質量	1.192+0.017; −0.016 M☉
半徑	1.82 R☉
表面重力 (log g)	3.97±0.02
亮度	3.45 L☉
溫度	5,809±59 K
金属量 [Fe/H]	0.11 dex
自轉速度 (v sin i)	3.7±0.3 km/s
年齡	5.64+0.35; −0.14 Gyr
其他命名
	μ Cnc、10 Cancri、BD+22° 1862、FK5 2630、HD 67228、HIP 39780、HR 3176、SAO 79959
參考資料庫
SIMBAD	资料

水位增六（巨蟹座Mu²）是一顆單獨的黃色恆星^[10]，位置在黃道星座的巨蟹座內。它是肉眼可見的恆星，視星等+5.30等^[2]，依據從地球測得的周年視差42.94毫角秒^[1]，這顆恆星與太陽的距離是76光年。水位增六將在60萬年後，以最接近的4.9 pc（16 ly）距離掠過太陽^[11]。

估計它的年齡是56億年，它已演化成G型次巨星，類型為C2IV。^[3]。它的質量是1.2倍太陽質量^[6]，和1.8倍的太陽半徑 ^[7]。水位增六有相對較高的金屬量 – 天文學家所謂的金屬是除了氫和氦之外的其他元素，比太陽的豐度高出29% ^[6]。它的輻射量太陽亮度的3.45倍3.45^[8]，表面的有效溫度是5,809k^[6]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
^ ^2.0 ^2.1 ^2.2 ^2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J.
^ ^3.0 ^3.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.
^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
^ ^5.0 ^5.1 Ammler-von Eiff, M.; Reiners, A., New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?, Astronomy & Astrophysics, June 2012, 542: 31, Bibcode:2012A&A...542A.116A, arXiv:1204.2459 , doi:10.1051/0004-6361/201118724, A116.
^ ^6.0 ^6.1 ^6.2 ^6.3 ^6.4 ^6.5 ^6.6 ^6.7 Ramírez, I.; et al, Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo, The Astrophysical Journal, February 2013, 764 (1): 78, Bibcode:2013ApJ...764...78R, arXiv:1301.1582 , doi:10.1088/0004-637X/764/1/78.
^ ^7.0 ^7.1 Takeda, Genya; et al, Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog, The Astrophysical Journal Supplement Series, February 2007, 168 (2): 297–318, Bibcode:2007ApJS..168..297T, arXiv:astro-ph/0607235 , doi:10.1086/509763.
^ ^8.0 ^8.1 McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
^ mu.02 Cnc. SIMBAD. 斯特拉斯堡天文資料中心. [2017-06-17].
^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
^ Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.

[vanLeeuwen2007-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.

[Johnson1966-2] 2.0 ^2.1 ^2.2 ^2.3 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99), Bibcode:1966CoLPL...4...99J.

[Gray2006-3] 3.0 ^3.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.

[deBruijne2012-4] Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.

[AmmlerVonEiff2012-5] 5.0 ^5.1 Ammler-von Eiff, M.; Reiners, A., New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?, Astronomy & Astrophysics, June 2012, 542: 31, Bibcode:2012A&A...542A.116A, arXiv:1204.2459 , doi:10.1051/0004-6361/201118724, A116.

[Ramirez2013-6] 6.0 ^6.1 ^6.2 ^6.3 ^6.4 ^6.5 ^6.6 ^6.7 Ramírez, I.; et al, Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo, The Astrophysical Journal, February 2013, 764 (1): 78, Bibcode:2013ApJ...764...78R, arXiv:1301.1582 , doi:10.1088/0004-637X/764/1/78.

[Takeda2007-7] 7.0 ^7.1 Takeda, Genya; et al, Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog, The Astrophysical Journal Supplement Series, February 2007, 168 (2): 297–318, Bibcode:2007ApJS..168..297T, arXiv:astro-ph/0607235 , doi:10.1086/509763.

[Mcdonald2012-8] 8.0 ^8.1 McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.

[SIMBAD-9] u.02 Cnc. SIMBAD. 斯特拉斯堡天文資料中心. [2017-06-17].

[Eggleton2008-10] Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.

[aa575_A35-11] Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.

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水位增六

參考資料

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