天兔座T

**天兔座T**
	; 天兔座T（下）和太陽與地球的軌道（上）的比較。
觀測資料; 曆元 J2000.0
星座	天兔座
星官
赤經	05h 04m 50.85s
赤緯	−21° 54′ 16.5″
視星等（V）	7.4 - 14.3
特性
光谱分类	M6e-M9e
变星类型	Mira
天体测定
徑向速度 (Rv)	−4 km/s
视差 (π)	2.9585 ± 0.1889 mas
距离	1,100 ± 70 ly ; (340 ± 20 pc)
詳細資料
質量	2.7 M☉
表面重力 (log g)	−0.5
溫度	2,800 K
其他命名
	T Lep、BD−22°995、CD−22°995、HD 32803、HIP 23636
參考資料庫
SIMBAD	资料

天兔座T（T Lep / HD 32803 / HIP 23636）是在星座天兔座的一顆變星。它在天球上距離屏二（天兔座ε）半度的地方；距離太陽系約為1,100光年。它的光譜類型為M6ev，與同在此星座的天兔座R一樣，也是一顆米拉變星。它的視星等在+7.40至+14.30之間變化，週期為368.13日^[2]。

天兔座T的年周視差是由依巴谷任務量測的，但結果非常不精確^[5]。蓋亞星表（英语：Gaia Data Release 2）的視差更準確，測得的距離為7019104913037769884♠340±20 pc^[1]。使用特長基線干涉測量法量測了距離，結果發現是7019100901656913977♠327±4 pc^[6]。

依據美國變星觀測者協會（AAVSO）的數據描繪的天兔座T在可見波段的光變曲線^[7]。

米拉變數是宇宙中一些分子和塵埃的主要來源。隨著每一次的恆星脈動（英语：Stellar pulsation），天兔座T都會將一些物質驅逐到太空，每年損失相當於地球質量的物質。用歐洲南方天文台（ESO）的甚大望遠鏡干涉儀獲得的天兔座T 的影像顯示，該恆星周圍有一層氣體和塵埃外殼，其直徑約為太陽的100倍^[8]。考慮到這類恆星距離遙遠，儘管其體積巨大，但其視角直徑不超過太陽視角直徑的百萬分之一。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 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 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1: B/gcvs. Bibcode:2009yCat....102025S.
^ Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. S2CID 119231169. arXiv:1606.08053 . doi:10.1134/S1063773706110065.
^ ^4.0 ^4.1 ^4.2 Pérez-Mesa, V.; Zamora, O.; García-Hernández, D. A.; Plez, B.; Manchado, A.; Karakas, A. I.; Lugaro, M. Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited. Astronomy and Astrophysics. 2017, 606: A20. Bibcode:2017A&A...606A..20P. S2CID 55190629. arXiv:1706.02268 . doi:10.1051/0004-6361/201731245.
^ 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.
^ Nakagawa, Akiharu; Omodaka, Toshihiro; Handa, Toshihiro; Honma, Mareki; Kawaguchi, Noriyuki; Kobayashi, Hideyuki; Oyama, Tomoaki; Sato, Katsuhisa; Shibata, Katsunori M.; Shizugami, Makoto; Tamura, Yoshiaki; Ueno, Yuji. VLBI astrometry of AGB variables with VERA: A Mira-type variable T Lepus. Publications of the Astronomical Society of Japan. 2014, 66 (6): 101. Bibcode:2014PASJ...66..101N. S2CID 118635632. arXiv:1404.4463 . doi:10.1093/pasj/psu103.
^ Download Data. aavso.org. AAVSO. [1 October 2021]. （原始内容存档于2023-03-15）.
^ Unique Details Of Double Star In Orion Nebula And Star T Leporis Captured By 'Virtual' Telescope. ScienceDaily. 19 February 2009 [2024-02-17]. （原始内容存档于2009-10-03）.

[dr2-1] 1.0 ^1.1 ^1.2 ^1.3 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

[gcvs-2] 2.0 ^2.1 ^2.2 ^2.3 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1: B/gcvs. Bibcode:2009yCat....102025S.

[rv-3] Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. S2CID 119231169. arXiv:1606.08053 . doi:10.1134/S1063773706110065.

[perez-mesa-4] 4.0 ^4.1 ^4.2 Pérez-Mesa, V.; Zamora, O.; García-Hernández, D. A.; Plez, B.; Manchado, A.; Karakas, A. I.; Lugaro, M. Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited. Astronomy and Astrophysics. 2017, 606: A20. Bibcode:2017A&A...606A..20P. S2CID 55190629. arXiv:1706.02268 . doi:10.1051/0004-6361/201731245.

[hipparcos-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.

[nakagawa-6] Nakagawa, Akiharu; Omodaka, Toshihiro; Handa, Toshihiro; Honma, Mareki; Kawaguchi, Noriyuki; Kobayashi, Hideyuki; Oyama, Tomoaki; Sato, Katsuhisa; Shibata, Katsunori M.; Shizugami, Makoto; Tamura, Yoshiaki; Ueno, Yuji. VLBI astrometry of AGB variables with VERA: A Mira-type variable T Lepus. Publications of the Astronomical Society of Japan. 2014, 66 (6): 101. Bibcode:2014PASJ...66..101N. S2CID 118635632. arXiv:1404.4463 . doi:10.1093/pasj/psu103.

[aavso-7] Download Data. aavso.org. AAVSO. [1 October 2021]. （原始内容存档于2023-03-15）.

[sciencedaily-8] Unique Details Of Double Star In Orion Nebula And Star T Leporis Captured By 'Virtual' Telescope. ScienceDaily. 19 February 2009 [2024-02-17]. （原始内容存档于2009-10-03）.

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天兔座T

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