zh %E5%BB%81%E5%A2%9E%E4%BA%94

**廁增五（θ Leporis）**
觀測資料; 曆元 J2000.0
星座	天兔座
星官	廁（參宿）
赤經	06h 06m 09.32339s
赤緯	−14° 56′ 06.9188″
視星等（V）	4.67
特性
光谱分类	A0 V
U−B 色指数	+0.00
B−V 色指数	+0.05
天体测定
徑向速度 (Rv)	+32.0 km/s
自行 (μ)	赤经：-17.61 mas/yr ; 赤纬：+12.79 mas/yr
视差 (π)	18.88 ± 0.54 mas
距离	173 ± 5 ly ; (53 ± 2 pc)
绝对星等 (MV)	+1.05
詳細資料
質量	2.35±0.03 M☉
表面重力 (log g)	4.12
亮度	41 L☉
溫度	10,453±355 K
自轉速度 (v sin i)	246 km/s
年齡	207 Myr
其他命名
	θ Lep、18 Lep、BD−14° 1331、FK5 2466、GC 7742、HD 41695、HIP 28910、HR 2155、SAO 151110
參考資料庫
SIMBAD	资料

廁增五（天兔座θ）拉丁化的名字來自θLeporis，是一顆孤獨的恆星^[9]。這顆白色的恆星，位於南天星座的天兔座。它的視星等為4.67等^[2]，使其明亮到可以用肉眼觀看。基於從地球量測的每年18.88mas的視差^[1]，該系統位於距離太陽大約173光年之處。這顆恆星大約在160萬年前最接近太陽，當時它位於太陽的29光年（9.0秒差距）範圍內^[10]。

這是一顆普通的A型主序星，恆星分類為A0V^[3]，年齡約2.07億年^[7]。它以207公里/秒的投影自轉速度快速旋轉^[7]。這使這顆恆星具有扁球的形狀，估計赤道隆起比極半徑大10%^[11]。估計它的質量為2.35太陽質量^[6]，來自光球的光度是太陽光度的41倍^[6]，表面的有效溫度為10,453k^[7]。

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 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
^ ^3.0 ^3.1 Houk, N., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1988, Bibcode:1988mcts.book.....H.
^ Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35 495 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.
^ 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.
^ ^6.0 ^6.1 ^6.2 ^6.3 Zorec, J.; Royer, F., Rotational velocities of A-type stars. IV. Evolution of rotational velocities, Astronomy & Astrophysics, January 2012, 537: A120, Bibcode:2012A&A...537A.120Z, S2CID 55586789, arXiv:1201.2052 , doi:10.1051/0004-6361/201117691.
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 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.
^ tet Lep. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-18].
^ 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.
^ Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, S2CID 59039482, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.
^ Belle, G. T., Interferometric observations of rapidly rotating stars, The Astronomy and Astrophysics Review, 2012, 20 (1): 51, Bibcode:2012A&ARv..20...51V, S2CID 119273474, arXiv:1204.2572 , doi:10.1007/s00159-012-0051-2.

[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.

[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): 99, Bibcode:1966CoLPL...4...99J.

[Houk1988_4-3] 3.0 ^3.1 Houk, N., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1988, Bibcode:1988mcts.book.....H.

[Gontcharov2006-4] Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35 495 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.

[Anderson2012-5] 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.

[Zorec2012-6] 6.0 ^6.1 ^6.2 ^6.3 Zorec, J.; Royer, F., Rotational velocities of A-type stars. IV. Evolution of rotational velocities, Astronomy & Astrophysics, January 2012, 537: A120, Bibcode:2012A&A...537A.120Z, S2CID 55586789, arXiv:1201.2052 , doi:10.1051/0004-6361/201117691.

[David2015-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 ^7.6 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.

[SIMBAD-8] tet Lep. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-18].

[Eggleton2008-9] 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.

[BailerJones2015-10] Bailer-Jones, C. A. L., Close encounters of the stellar kind, Astronomy & Astrophysics, March 2015, 575: 13, Bibcode:2015A&A...575A..35B, S2CID 59039482, arXiv:1412.3648 , doi:10.1051/0004-6361/201425221, A35.

[belle2012-11] Belle, G. T., Interferometric observations of rapidly rotating stars, The Astronomy and Astrophysics Review, 2012, 20 (1): 51, Bibcode:2012A&ARv..20...51V, S2CID 119273474, arXiv:1204.2572 , doi:10.1007/s00159-012-0051-2.

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