水位一

**水位一**
觀測資料; 曆元 J2000.0 (ICRS)
星座	小犬座
星官	水位（井宿）
赤經	07h 29m 47.78172s[1]
赤緯	+12° 00′ 23.6347″[1]
視星等（V）	+4.55[2]
特性
演化阶段	巨星
光谱分类	K1 III[3]
B−V 色指数	1.276±0.001[2]
天体测定
徑向速度 (Rv)	−16.31±0.13[4] km/s
自行 (μ)	赤经：−0.57[1] mas/yr ; 赤纬：−18.85[1] mas/yr
视差 (π)	5.70 ± 0.21[1] mas
距离	570 ± 20 ly ; (175 ± 6 pc)
绝对星等 (MV)	−1.67[2]
詳細資料
質量	4.0[5] M☉
半徑	44[6] R☉
亮度	761.44[2] L☉
溫度	4,370[5] K
金属量 [Fe/H]	0.02[5] dex
自轉速度 (v sin i)	1.7[7] km/s
其他命名
	6 CMi、BD+12°1567、FK5 1193、GC 10024、HD 59294、HIP 36425、HR 2864、SAO 96952[8]
參考資料庫
SIMBAD	资料

水位一（小犬6 ，6 Canis Minoris）是赤道星座小犬座的一顆恆星，距離太陽大約570光年。它是一顆肉眼可見，黯淡的橙色恒星，視星等為+4.55等[2]。這顆恆星正以日心點運動學−16.3 km/s 徑向速度向地球靠近[4]，它是屬於天狼星超星系團的大熊座星流周邊一個群的成員[9]

這是一顆演化的巨星，恆星分類為K1 III.[3]。它有輕度的鋇異常[10]，這可能表明這是一顆有白矮星伴星的聯星系統[11]。對可見分量的干涉量測-量測的角直徑約為6992111991960336303♠2.31±0.03 mas[12]，估計其距離相當於約44倍太陽半徑的物理半徑[6]。質量約為4 太陽質量[5]，在4,370k的有效溫度下[5]，其擴大光球的輻射為太陽的761倍[2]。

參考資料

van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
Anderson, E.; Francis, Ch., , Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
Keenan, Philip C.; McNeil, Raymond C., , Astrophysical Journal Supplement Series, 1989, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. . Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
Gondoin, P., , Astronomy and Astrophysics, December 1999, 352: 217–227, Bibcode:1999A&A...352..217G.
Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2023-12-20], ISBN 3-540-29692-1, （原始内容存档于2023-07-28）. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 175.4\cdot 2.31)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 87.2\cdot R_{\bigodot }\end{aligned}}$
De Medeiros, J. R.; et al, , Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273 .
. SIMBAD. 斯特拉斯堡天文資料中心.
Chupina, N. V.; et al, , Astronomy and Astrophysics, June 2006, 451 (3): 909–916, Bibcode:2006A&A...451..909C, doi:10.1051/0004-6361:20054009 .
Escorza, A.; et al, , Astronomy & Astrophysics, December 2017, 608: 13, Bibcode:2017A&A...608A.100E, S2CID 119428276, arXiv:1710.02029 , doi:10.1051/0004-6361/201731832, A100.
Eggleton, P. P.; Tokovinin, A. A., , Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
Richichi, A.; et al, , Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

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[vanLeeuwen2007-1] van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.

[Anderson2012-2] Anderson, E.; Francis, Ch., , Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.

[Keenan1989-3] Keenan, Philip C.; McNeil, Raymond C., , Astrophysical Journal Supplement Series, 1989, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[GaiaDR2-4] Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. . Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录

[Gondoin1999-5] Gondoin, P., , Astronomy and Astrophysics, December 1999, 352: 217–227, Bibcode:1999A&A...352..217G.

[lang2006-6] Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2023-12-20], ISBN 3-540-29692-1, （原始内容存档于2023-07-28）. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 175.4\cdot 2.31)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 87.2\cdot R_{\bigodot }\end{aligned}}$

[DeMedeiros2000-7] De Medeiros, J. R.; et al, , Astronomy and Astrophysics, November 2000, 363: 239–243, Bibcode:2000A&A...363..239D, arXiv:astro-ph/0010273 .

[Simbad-8] . SIMBAD. 斯特拉斯堡天文資料中心.

[Chupina2006-9] Chupina, N. V.; et al, , Astronomy and Astrophysics, June 2006, 451 (3): 909–916, Bibcode:2006A&A...451..909C, doi:10.1051/0004-6361:20054009 .

[Escorza2017-10] Escorza, A.; et al, , Astronomy & Astrophysics, December 2017, 608: 13, Bibcode:2017A&A...608A.100E, S2CID 119428276, arXiv:1710.02029 , doi:10.1051/0004-6361/201731832, A100.

[Eggleton2008-11] Eggleton, P. P.; Tokovinin, A. A., , Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.

[Richichi2005-12] Richichi, A.; et al, , Astronomy and Astrophysics, February 2005, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039 