水府一

**水府一( 獵戶座ν)**
	水府一的位置(紅圈)
觀測資料; 曆元 J2000.0
星座	獵戶座
星官	水府（參宿）
赤經	06h 07m 34.32588s[1]
赤緯	+14° 46′ 06.5061″[1]
視星等（V）	4.42[2]
特性
光谱分类	B3 V[3] or B3 IV[4]
U−B 色指数	−0.67[2]
B−V 色指数	−0.18[2]
天体测定
徑向速度 (Rv)	+24.1[5] km/s
自行 (μ)	赤经：+6.78[1] mas/yr ; 赤纬：−20.23[1] mas/yr
视差 (π)	6.32 ± 0.33[1] mas
距离	520 ± 30 ly ; (158 ± 8 pc)
	軌道[6]
繞行週期 (P)	131.211 d
偏心率 (e)	0.64
近心点曆元 (T)	2436475.852 JD
近心點幅角 (ω); (secondary)	6.6°
半振幅 (K1); (primary)	33.3 km/s
詳細資料
ν Ori A
質量	6.7±0.1[4] M☉
半徑	4.3[7] R☉
表面重力 (log g)	4.06[8]
亮度	1,965[3] L☉
溫度	17,880[8] K
金属量 [Fe/H]	−0.05[8] dex
自轉速度 (v sin i)	30[9] km/s
年齡	26.3±5.3[4] Myr
其他命名
	ν Ori, 67 Orionis, BD+14° 1152, FK5 232, HD 41753, HIP 29038, HR 2159, SAO 95259.[10]
參考資料庫
SIMBAD	资料

水府一（獵戶座ν）是位於獵戶座東北部的一對聯星[11]，不要將其與變星獵戶座NU混淆[12]。水府一的視星等為4.42[2]，這足夠明亮，因此可以用肉眼直接看到。依據0.00632弧秒的年週視差[1]，這個系統的距離大約是520光年。

這是肘有一組譜線的光譜聯星系統[9]，這意味著只能分析其中一個成員的吸收譜線特徵。根據這個分量的繞行，週期為131.2天，離心率為0.64[6]。根據這個來源，主星要麼是恆星分類為B3V的B型主序星[3]，或是已經演化成為B3IV的B型次巨星[4]。它的角直徑為0.251mas[13]，以這個系統的距離估計，它的實際半徑約為4.3R_☉（太陽半徑）[7]，質量是6.7M_☉（太陽質量）[4]，光度是1,965L_☉（太陽光度）[3]，大氣層表面的有效溫度為17,880K[8]。

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.
Crawford, D. L.; et al, , The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
Hohle, M. M.; et al, , Astronomische Nachrichten, April 2010, 331 (4): 349–360, Bibcode:2010AN....331..349H, S2CID 111387483, arXiv:1003.2335 , doi:10.1002/asna.200911355.
Tetzlaff, N.; et al, , Monthly Notices of the Royal Astronomical Society, 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, S2CID 118629873, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
Evans, D. S., , Batten, Alan Henry; Heard, John Frederick (编), 30, University of Toronto: International Astronomical Union: 57, June 20–24, 1966, Bibcode:1967IAUS...30...57E.
Pourbaix, D.; et al, , Astronomy and Astrophysics, 2004, 424 (2): 727–732, Bibcode:2004A&A...424..727P, S2CID 119387088, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2021-12-06], ISBN 3-540-29692-1, （原始内容存档于2019-05-20）.. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(158.2\cdot 0.251\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 8.5\cdot R_{\bigodot }\end{aligned}}$
Gies, Douglas R.; Lambert, David L., , Astrophysical Journal, Part 1, March 1992, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116.
Abt, Helmut A.; et al, , The Astrophysical Journal, July 2002, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590 .
. SIMBAD. 斯特拉斯堡天文資料中心.
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.
Marett-Crosby, Michael, , The Patrick Moore Practical Astronomy Series, Springer Science & Business Media: 93, 2013 [2021-12-06], ISBN 978-1461468004, （原始内容存档于2021-12-06）.
Zorec, J.; et al, , Astronomy and Astrophysics, July 2009, 501 (1): 297–320, Bibcode:2009A&A...501..297Z, S2CID 14969137, arXiv:0903.5134 , doi:10.1051/0004-6361/200811147.

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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.

[Crawford1971-2] Crawford, D. L.; et al, , The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.

[Neuhaeuser2010-3] Hohle, M. M.; et al, , Astronomische Nachrichten, April 2010, 331 (4): 349–360, Bibcode:2010AN....331..349H, S2CID 111387483, arXiv:1003.2335 , doi:10.1002/asna.200911355.

[tetzlaff2011-4] Tetzlaff, N.; et al, , Monthly Notices of the Royal Astronomical Society, 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, S2CID 118629873, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.

[rgcrv-5] Evans, D. S., , Batten, Alan Henry; Heard, John Frederick (编), 30, University of Toronto: International Astronomical Union: 57, June 20–24, 1966, Bibcode:1967IAUS...30...57E.

[pourbaix2004-6] Pourbaix, D.; et al, , Astronomy and Astrophysics, 2004, 424 (2): 727–732, Bibcode:2004A&A...424..727P, S2CID 119387088, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.

[lang2006-7] Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2021-12-06], ISBN 3-540-29692-1, （原始内容存档于2019-05-20）.. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(158.2\cdot 0.251\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 8.5\cdot R_{\bigodot }\end{aligned}}$

[Gies1992-8] Gies, Douglas R.; Lambert, David L., , Astrophysical Journal, Part 1, March 1992, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116.

[Abt2002-9] Abt, Helmut A.; et al, , The Astrophysical Journal, July 2002, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590 .

[SIMBAD-10] . SIMBAD. 斯特拉斯堡天文資料中心.

[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.

[MarettCrosby2013-12] Marett-Crosby, Michael, , The Patrick Moore Practical Astronomy Series, Springer Science & Business Media: 93, 2013 [2021-12-06], ISBN 978-1461468004, （原始内容存档于2021-12-06）.

[Zorec2009-13] Zorec, J.; et al, , Astronomy and Astrophysics, July 2009, 501 (1): 297–320, Bibcode:2009A&A...501..297Z, S2CID 14969137, arXiv:0903.5134 , doi:10.1051/0004-6361/200811147.