格利泽908

格利泽908是一颗位于双鱼座的红矮星，距离地球19.3光年。它是一颗天龙座BY型变星，变星编号为BR Piscium。由于星斑和不同的色球活动，它的视星等在8.93和9.03之间变化。

Gliese 908

格利泽908的可见光变曲线[1]
观测资料 历元 J2000
星座	双鱼座
星官
赤经	23h 49m 12.52790s[2]
赤纬	02° 24′ 04.4072″[2]
视星等（V）	8.93 - 9.03[3]
特性
光谱分类	M1V Fe-1[4]
变星类型	BY Dra[3]
天体测定
径向速度 (Rv)	2998282099999999999♠−71.79[5] km/s
自行 (μ)	赤经：7002992665000000000♠992.665[5] mas/yr 赤纬：2997031351999999999♠−968.648[5] mas/yr
视差 (π)	169.2163 ± 0.0281[6] mas
距离	19.275 ± 0.003 ly (5.9096 ± 0.0010 pc)
绝对星等 (MV)	+10.1[7]
详细资料
质量	0.37[8] M☉
半径	0.39[9] R☉
表面重力 (log g)	4.86[9]
亮度 (bolometric)	0.022[9] L☉
温度	3,570[9] K
金属量 [Fe/H]	3000490000000000000♠−0.51±0.05[10] dex
自转速度 (v sin i)	2.25[11] km/s
其他命名
BR Piscium、​BD+01°4774、​GJ 908[12]、​HIP 117473[2]、​SAO 128397、​PPM 174453、​G 29-68、​G 31-6、​LHS 550[13]、​LTT 17014、​PLX 5763[14]、​TYC 586-610-1[15]、​GSC 00586-00610、​IRAS 23466+0207、​2MASS J23491255+0224037
参考数据库
SIMBAD	资料
Gliese 908 格利泽908在双鱼座的位置

格利泽908的可变性在1994年得到确认，尽管其亮度变化没有检测到周期性。^[16]1997年进入变星总表。^[17]

格利泽908是一颗主序星，光谱等级为M1V Fe-1。后缀表示明显缺乏重元素。^[4]

参考

1. ASAS-SN Variable Stars Database. ASAS-SN Variable Stars Database. ASAS-SN. [6 January 2022]. （原始内容存档于2023-01-11）.
2. Perryman; et al. HIP 117473. The Hipparcos and Tycho Catalogues. 1997 [2023-03-21]. （原始内容存档于2016-03-04）.
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.
4. Keenan, Philip C.; McNeil, Raymond C. The Perkins Catalog of Revised MK Types for the Cooler Stars. The Astrophysical Journal Supplement Series. 1989, 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
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
6. Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
7. Boro Saikia, S.; et al, Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles, Astronomy and Astrophysics, 2018, 616: A108, Bibcode:2018A&A...616A.108B, S2CID 118915212, arXiv:1803.11123 , doi:10.1051/0004-6361/201629518.
8. Perger, M.; García-Piquer, A.; Ribas, I.; Morales, J. C.; Affer, L.; Micela, G.; Damasso, M.; Suárez-Mascareño, A.; González-Hernández, J. I.; Rebolo, R.; Herrero, E.; Rosich, A.; Lafarga, M.; Bignamini, A.; Sozzetti, A.; Claudi, R.; Cosentino, R.; Molinari, E.; Maldonado, J.; Maggio, A.; Lanza, A. F.; Poretti, E.; Pagano, I.; Desidera, S.; Gratton, R.; Piotto, G.; Bonomo, A. S.; Martinez Fiorenzano, A. F.; Giacobbe, P.; et al. HADES RV Programme with HARPS-N at TNG. II. Data treatment and simulations. Astronomy and Astrophysics. 2017, 598: A26. Bibcode:2017A&A...598A..26P. S2CID 56341358. arXiv:1610.08698 . doi:10.1051/0004-6361/201628985.
9. Maldonado, J.; Affer, L.; Micela, G.; Scandariato, G.; Damasso, M.; Stelzer, B.; Barbieri, M.; Bedin, L. R.; Biazzo, K.; Bignamini, A.; Borsa, F.; Claudi, R. U.; Covino, E.; Desidera, S.; Esposito, M.; Gratton, R.; González Hernández, J. I.; Lanza, A. F.; Maggio, A.; Molinari, E.; Pagano, I.; Perger, M.; Pillitteri, I.; Piotto, G.; Poretti, E.; Prisinzano, L.; Rebolo, R.; Ribas, I.; Shkolnik, E.; et al. Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths. Astronomy and Astrophysics. 2015, 577: A132. Bibcode:2015A&A...577A.132M. S2CID 53582613. arXiv:1503.03010 . doi:10.1051/0004-6361/201525797.
10. Lindgren, Sara; Heiter, Ulrike. Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature. Astronomy and Astrophysics. 2017, 604: A97. Bibcode:2017A&A...604A..97L. S2CID 119216828. arXiv:1705.08785 . doi:10.1051/0004-6361/201730715.
11. Houdebine, E. R. Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars. Monthly Notices of the Royal Astronomical Society. 2010, 407 (3): 1657–1673. Bibcode:2010MNRAS.407.1657H. doi:10.1111/j.1365-2966.2010.16827.x .
12. Gliese, W.; Jahreiß, H. Gl 908. Preliminary Version of the Third Catalogue of Nearby Stars. 1991 [2023-03-21]. （原始内容存档于2016-03-04）.
13. Luyten, Willem Jacob. LHS 550. LHS Catalogue, 2nd Edition. 1979 [2023-03-21]. （原始内容存档于2020-09-25）.
14. Van Altena W. F.; Lee J. T.; Hoffleit E. D. GCTP 5763. The General Catalogue of Trigonometric Stellar Parallaxes Fourth. 1995 [2023-03-21]. （原始内容存档于2016-03-04）.
15. Perryman; et al. HIP 117473. The Hipparcos and Tycho Catalogues. 1997 [2023-03-21]. （原始内容存档于2016-03-04）.
16. Weis, Edward W. Long Term Variability in Dwarf M Stars. The Astronomical Journal. 1994, 107: 1135. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.
17. Kazarovets, E. V.; Samus, N. N. The 73rd Name-List of Variable Stars. Information Bulletin on Variable Stars. 1997, 4471: 1. Bibcode:1997IBVS.4471....1K.