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
赤緯	+14° 46′ 06.5061″
視星等（V）	4.42
特性
光譜分類	B3 V or B3 IV
U−B 色指數	−0.67
B−V 色指數	−0.18
天體測定
徑向速度 (Rv)	+24.1 km/s
自行 (μ)	赤經：+6.78 mas/yr ; 赤緯：−20.23 mas/yr
視差 (π)	6.32 ± 0.33 mas
距離	520 ± 30 ly ; (158 ± 8 pc)
	軌道
繞行週期 (P)	131.211 d
偏心率 (e)	0.64
近心點曆元 (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 M☉
半徑	4.3 R☉
表面重力 (log g)	4.06
亮度	1,965 L☉
溫度	17,880 K
金屬量 [Fe/H]	−0.05 dex
自轉速度 (v sin i)	30 km/s
年齡	26.3±5.3 Myr
其他命名
	ν Ori, 67 Orionis, BD+14° 1152, FK5 232, HD 41753, HIP 29038, HR 2159, SAO 95259.
參考資料庫
SIMBAD	資料

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]，這意味着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

^ ^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, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
^ ^2.0 ^2.1 ^2.2 ^2.3 Crawford, D. L.; et al, Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere, The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
^ ^3.0 ^3.1 ^3.2 ^3.3 Hohle, M. M.; et al, Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349–360, Bibcode:2010AN....331..349H, S2CID 111387483, arXiv:1003.2335 , doi:10.1002/asna.200911355.
^ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, 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., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (編), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 30, University of Toronto: International Astronomical Union: 57, June 20–24, 1966, Bibcode:1967IAUS...30...57E.
^ ^6.0 ^6.1 Pourbaix, D.; et al, S_B⁹: The ninth catalogue of spectroscopic binary orbits, 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.
^ ^7.0 ^7.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2021-12-06], ISBN 3-540-29692-1, （原始內容存檔於2019-05-20）. . The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(158.2\cdot 0.251\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 8.5\cdot R_{\bigodot }\end{aligned}}$
^ ^8.0 ^8.1 ^8.2 ^8.3 Gies, Douglas R.; Lambert, David L., Carbon, nitrogen, and oxygen abundances in early B-type stars, Astrophysical Journal, Part 1, March 1992, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116.
^ ^9.0 ^9.1 Abt, Helmut A.; et al, Rotational Velocities of B Stars, The Astrophysical Journal, July 2002, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590 .
^ nu. Ori. 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.
^ Marett-Crosby, Michael, Twenty-Five Astronomical Observations That Changed the World: And How To Make Them Yourself, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media: 93, 2013 [2021-12-06], ISBN 978-1461468004, （原始內容存檔於2021-12-06）.
^ Zorec, J.; et al, Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into T_eff, 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.

[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, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.

[Crawford1971-2] 2.0 ^2.1 ^2.2 ^2.3 Crawford, D. L.; et al, Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere, The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.

[Neuhaeuser2010-3] 3.0 ^3.1 ^3.2 ^3.3 Hohle, M. M.; et al, Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349–360, Bibcode:2010AN....331..349H, S2CID 111387483, arXiv:1003.2335 , doi:10.1002/asna.200911355.

[tetzlaff2011-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, 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., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (編), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 30, University of Toronto: International Astronomical Union: 57, June 20–24, 1966, Bibcode:1967IAUS...30...57E.

[pourbaix2004-6] 6.0 ^6.1 Pourbaix, D.; et al, S_B⁹: The ninth catalogue of spectroscopic binary orbits, 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] 7.0 ^7.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2021-12-06], ISBN 3-540-29692-1, （原始內容存檔於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] 8.0 ^8.1 ^8.2 ^8.3 Gies, Douglas R.; Lambert, David L., Carbon, nitrogen, and oxygen abundances in early B-type stars, Astrophysical Journal, Part 1, March 1992, 387: 673–700, Bibcode:1992ApJ...387..673G, doi:10.1086/171116.

[Abt2002-9] 9.0 ^9.1 Abt, Helmut A.; et al, Rotational Velocities of B Stars, The Astrophysical Journal, July 2002, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590 .

[SIMBAD-10] u. Ori. SIMBAD. 斯特拉斯堡天文資料中心.

[Eggleton2008-11] 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.

[MarettCrosby2013-12] Marett-Crosby, Michael, Twenty-Five Astronomical Observations That Changed the World: And How To Make Them Yourself, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media: 93, 2013 [2021-12-06], ISBN 978-1461468004, （原始內容存檔於2021-12-06）.

[Zorec2009-13] Zorec, J.; et al, Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into T_eff, 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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觀測資料曆元 J2000.0
水府一的位置(紅圈)
星座	獵戶座
星官	水府（參宿）
赤經	06^h 07^m 34.32588^s^[1]
赤緯	+14° 46′ 06.5061″^[1]
視星等（V）	4.42^[2]
特性
光譜分類	B3 V^[3] or B3 IV^[4]
U−B 色指數	−0.67^[2]
B−V 色指數	−0.18^[2]
天體測定

徑向速度 (R_v)	+24.1^[5] km/s
自行 (μ)	赤經：+6.78^[1] mas/yr 赤緯：−20.23^[1] mas/yr
視差 (π)	6.32 ± 0.33^[1] mas
距離	520 ± 30 ly (158 ± 8 pc)

軌道^[6]
繞行週期 (P)	131.211 d
偏心率 (e)	0.64
近心點曆元 (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	7000670000000000000♠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
金屬量 [Fe/H]	−0.05^[8] dex
自轉速度 (v sin i)	30^[9] km/s
年齡	7001263000000000000♠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	資料

閱論編獵戶座的恆星
拜耳命名	α β γ δ ε ζ η θ¹ (Trapezium Cluster) θ² ι κ λ (Meissa) μ ν ξ ο¹ ο² π¹ π² π³ π⁴ π⁵ π⁶ ρ σ τ υ φ¹ (Khad) φ² χ¹ χ² ψ ω
佛蘭斯蒂德命名	5 6 11 13 14 15 16 18 21 22 23 25 27 29 37 40 67
HD星表	HD 34445 HD 37605 HD 290327（英語：HD 290327）
格利澤近星	葛利斯179 格利澤221 GJ 3379 格利澤205 格利澤213 GJ 9193
其他	12 26 31 32 33 35 36 38 42 45 49 51 52 55 56 57 59 60 63 64 65 66 68 69 71 72 73 74 75 WISE J0521+1025 G 99-47
列表

閱論編星官水府包括的恆星
正星	水府一水府二水府三水府四
增星	水府增一水府增二水府增三水府增四水府增五水府增六水府增七水府增八