天苑十一

天苑十一
觀測資料
曆元 J2000.0 (ICRS)
星座 波江座
星官
赤經 03h 19m 31.00224s[1]
赤緯 −21° 45′ 28.3049″[1]
視星等（V） 3.65[2]
特性
光谱分类M3/4 III[3]
U−B 色指数+1.79[2]
B−V 色指数+1.61[2]
变星类型Lb[4]
天体测定
徑向速度 (Rv)+41.7±0.7[5] km/s
自行 (μ) 赤经：+51.89[1] mas/yr
赤纬：+32.92[1] mas/yr
视差 (π)10.71 ± 0.54[1] mas
距离300 ± 20 ly
(93 ± 5 pc)
绝对星等 (MV)−0.79[6]
詳細資料
質量1.8±0.3[7] M☉
半徑106[8] R☉
亮度1,537[9] L☉
溫度3,712[7] K
其他命名
τ4 Eridani, τ4 Eri, 16 Eridani, BD-22° 584, HD 20720, HIP 15474, HR 1003, SAO 168460.[10]
參考資料庫
SIMBADdata

天苑十一（波江座τ4）是位于波江座的双星系统，其视星等为3.65。

参考文献
  1. van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357.
  2. Mermilliod, J.-C., , SIMBAD, 1986, Bibcode:1986EgUBV........0M.
  3. Houk, N.; Smith-Moore, M., 4, 1988, Bibcode:1988MSS...C04....0H.
  4. Ruban, E. V.; 等, , Astronomy Letters, September 2006, 32 (9): 604–607, Bibcode:2006AstL...32..604R, doi:10.1134/S1063773706090052.
  5. Gontcharov, G. A., , Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, arXiv:1606.08053, doi:10.1134/S1063773706110065.
  6. Cardini, D., , Astronomy and Astrophysics, January 2005, 430: 303−311, Bibcode:2005A&A...430..303C, arXiv:astro-ph/0409683, doi:10.1051/0004-6361:20041440.
  7. Halabi, Ghina M.; Eid, Mounib El. . Monthly Notices of the Royal Astronomical Society. 2015, 451 (3): 2957. Bibcode:2015MNRAS.451.2957H. arXiv:1507.01517. doi:10.1093/mnras/stv1141.
  8. Lang, Kenneth R., , Astronomy and astrophysics library 1 3, Birkhäuser, 2006, ISBN 3-540-29692-1. The radius (R*) is given by:
  9. McDonald, I.; 等, , Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037, doi:10.1111/j.1365-2966.2012.21873.x.
  10. . SIMBAD. 斯特拉斯堡天文資料中心. [2016-10-13].
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