天市右垣八
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天市右垣八（巨蛇座ε），也稱巴[9]，是位於巨蛇座的恆星，其視星等為3.69。
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 巨蛇座 |
| 星官 | |
| 赤經 | 15h 50m 48.96622s[1] |
| 赤緯 | +04° 28′ 39.8311″[1] |
| 視星等（V） | +3.69[2] |
| 特性 | |
| 光譜分類 | kA2hA5mA7 V[3] |
| U−B 色指數 | +0.12[2] |
| B−V 色指數 | +0.14[2] |
| 天體測定 | |
| 徑向速度 (Rv) | −9.4±0.6[4] km/s |
| 自行 (μ) | 赤經：+128.19[1] mas/yr 赤緯：+62.16[1] mas/yr |
| 視差 (π) | 46.30 ± 0.19[1] mas |
| 距離 | 70.4 ± 0.3 ly (21.60 ± 0.09 pc) |
| 絕對星等 (MV) | +2.04[5] |
| 詳細資料 | |
| 質量 | 1.820±0.026[6] M☉ |
| 半徑 | 1.783±0.040[6] R☉ |
| 表面重力 (log g) | 4.346[7] |
| 亮度 | 12.134±0.296[6] L☉ |
| 溫度 | 7,928±88[7] K |
| 金屬量 [Fe/H] | +0.38[7] dex |
| 自轉速度 (v sin i) | 33.1[7] km/s |
| 年齡 | 500±200[6] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
參考文獻
- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 Feinstein, A., Photoelectric UBVRI observations of Am stars, Astronomical Journal, 1974, 79: 1290, Bibcode:1974AJ.....79.1290F, doi:10.1086/111675.
- ^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.
- ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
- ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
- ^ 6.0 6.1 6.2 6.3 Boyajian, Tabetha S.; et al, Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars, The Astrophysical Journal, February 2012, 746 (1): 101, Bibcode:2012ApJ...746..101B, arXiv:1112.3316 , doi:10.1088/0004-637X/746/1/101.. See Table 10.
- ^ 7.0 7.1 7.2 7.3 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, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- ^ eps Ser. SIMBAD. 斯特拉斯堡天文資料中心. [2017-09-26].
- ^ Rodriguez, David R.; et al, Stellar multiplicity and debris discs: an unbiased sample, Monthly Notices of the Royal Astronomical Society, May 2015, 449 (3): 3160–3170, Bibcode:2015MNRAS.449.3160R, arXiv:1503.01320 , doi:10.1093/mnras/stv483.
