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**水位二（小犬座11）**
觀測資料; 曆元 J2000.0 (ICRS)
星座	小犬座
星官	水位（鬼宿）
赤經	07h 46m 16.20081s
赤緯	+10° 46′ 05.7055″
視星等（V）	5.25
特性
光谱分类	A1Vnn
B−V 色指数	0.018±0.008
天体测定
徑向速度 (Rv)	+28.0±4.2 km/s
自行 (μ)	赤经：−29.902 mas/yr ; 赤纬：−25.275 mas/yr
视差 (π)	10.4262 ± 0.2007 mas
距离	313 ± 6 ly ; (96 ± 2 pc)
绝对星等 (MV)	0.42
詳細資料
質量	2.23 M☉
半徑	2.5 R☉
表面重力 (log g)	3.60
亮度	65.26 L☉
溫度	9,972±339 K
年齡	149 Myr
其他命名
	11 CMi、NSV 3724、BD+11°1670、FK5 1201、GC 10463、HD 62832、HIP 37921、HR 3008、SAO 97224
參考資料庫
SIMBAD	资料

水位二也稱為小犬座11是在赤道星座小犬座 ^[7]的一顆恆星^[8]，距離太陽約313光年^[1]。它是一顆肉眼可見的微弱白色恒星，視星等為+5.25^[2]。它正以相對於日心+28公里/秒的徑向速度遠離地球^[4]，大約235萬年前的距離在157光年以內^[2]。

這是一顆A型主序星，其恆星分類為A1Vnn^[3]，其中的符號「n」表示由於快速旋轉而導致的（非常）「模糊」線。然而，Gray和Garrison（1987）發現了一個A0.5Ivnn的分類^[9]，這將與一顆演化的次巨星相匹配。這是一顆未知類型的可疑變星^[10]。它的年齡為1億4900萬年^[5]，質量是2.23倍太陽質量^[5]，半徑是2.5倍太陽半徑^[6]。它以9,972K的有效溫度^[5]從光球層輻射65倍的太陽光度^[2]

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. 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
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
^ ^3.0 ^3.1 Cowley, A.; et al, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
^ ^4.0 ^4.1 Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, S2CID 119231169, arXiv:1606.08053 , doi:10.1134/S1063773706110065.
^ ^5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 ^5.6 David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID 33401607, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
^ ^6.0 ^6.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS), Astronomy and Astrophysics Third, February 2001, 367 (2): 521–524, Bibcode:2001A&A...367..521P, S2CID 425754, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.
^ ^7.0 ^7.1 11 CMi. SIMBAD. 斯特拉斯堡天文資料中心.
^ 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, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x .
^ Gray, R. O.; Garrison, R. F., The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation, Astrophysical Journal Supplement, December 1987, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237 .
^ Samus, N. N.; et al, General Catalogue of Variable Stars, Astronomy Reports, 5.1, 2017, 61 (1): 80–88, Bibcode:2017ARep...61...80S, S2CID 125853869, doi:10.1134/S1063772917010085.

[GaiaDR2-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. 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

[Anderson2012-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.

[Cowley1969-3] 3.0 ^3.1 Cowley, A.; et al, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.

[Gontcharov2006-4] 4.0 ^4.1 Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, S2CID 119231169, arXiv:1606.08053 , doi:10.1134/S1063773706110065.

[David2015-5] 5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 ^5.6 David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID 33401607, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.

[cadars-6] 6.0 ^6.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS), Astronomy and Astrophysics Third, February 2001, 367 (2): 521–524, Bibcode:2001A&A...367..521P, S2CID 425754, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.

[Simbad-7] 7.0 ^7.1 11 CMi. SIMBAD. 斯特拉斯堡天文資料中心.

[Eggleton2008-8] 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, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x .

[Gray1987-9] Gray, R. O.; Garrison, R. F., The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation, Astrophysical Journal Supplement, December 1987, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237 .

[Samus2017-10] Samus, N. N.; et al, General Catalogue of Variable Stars, Astronomy Reports, 5.1, 2017, 61 (1): 80–88, Bibcode:2017ARep...61...80S, S2CID 125853869, doi:10.1134/S1063772917010085.

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水位二

參考資料

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