格利泽445：修订间差异
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2012年7月22日 (日) 03:09的版本
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 鹿豹座 |
| 星官 | |
| 赤經 | 11h 47m 41.3771s[1] |
| 赤緯 | +78° 41′ 28.178″[1] |
| 視星等（V） | 10.78[1] |
| 特性 | |
| 光谱分类 | M3.5[1] |
| B−V 色指数 | 1.6[1] |
| V−R 色指数 | 0.8[1] |
| R−I 色指数 | 0.8[1] |
| 天体测定 | |
| 徑向速度 (Rv) | −119[1] km/s |
| 自行 (μ) | 赤经：743.58[1] mas/yr 赤纬：480.47[1] mas/yr |
| 视差 (π) | 185.52 ± 1.43[1] mas |
| 距离 | 17.6 ± 0.1 ly (5.39 ± 0.04 pc) |
| 詳細資料 | |
| 質量 | 0.15[2]–0.30[3] M☉ |
| 半徑 | 0.320[3] R☉ |
| 參考資料庫 | |
| SIMBAD | 资料 |
| ARICNS | 资料 |
| 其他命名 | |
格利泽445（Gl 445）is an M-type main sequence star in the constellation of Camelopardalis, close to Polaris. It is currently 17.6 light-years from the Sun and has an apparent magnitude of 10.8.[1] It is visible from north of the Tropic of Cancer all night long, but not to the naked eye.[4]
旅行者1号
The star is notable because the Voyager 1 probe will pass within 1.6 light years of it in about 40,000 years.[5] Because the star is a red dwarf with a mass only a quarter to a third of that of our Sun, scientists do not believe that its solar system can support life.[4]
与太阳系相遇
While the Voyager probe flies through space slowly closing on Gliese 445, the star is rapidly approaching the Sun. At the time the probe passes Gliese 445, the star will be about 1.059 parsecs (3.45 light-years) from the Sun,[2] but with less than half the brightness necessary to be seen with the naked eye.[4] But the dwarf star will still be further away than other stars have achieved.
X射线源
Gliese 445 emits X-rays.[6]
参考文献
- ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 LHS 2459 -- High proper-motion Star, database entry, SIMBAD. Accessed on line July 29, 2008.
- ^ 2.0 2.1 Bobylev, Vadim V. Searching for Stars Closely Encountering with the Solar System. Astronomy Letters. 2010, 36 (3): 220–226. Bibcode:2010AstL...36..220B. arXiv:1003.2160
. doi:10.1134/S1063773710030060. 已忽略未知参数|month=（建议使用|date=） (帮助) - ^ 3.0 3.1 AC+79 3888, entry, Catalogue of nearest stars until 10pc, V. A. Zakhozhaj, CDS ID V/101.
- ^ 4.0 4.1 4.2 Page 168, Planets Beyond: Discovering the Outer Solar System, Mark Littmann, Mineola, New York: Courier Dover Publications, 2004, ISBN 0-486-43602-0.
- ^ NASA – Voyager - Mission - Interstellar Mission
- ^ Schmitt JHMM, Fleming TA, Giampapa MS. The X-Ray View of the Low-Mass Stars in the Solar Neighborhood. Ap J. 1995, 450 (9): 392–400. Bibcode:1995ApJ...450..392S. doi:10.1086/176149. 已忽略未知参数
|month=（建议使用|date=） (帮助)
外部链接
- Wikisky image of TYC 4553-192-1 (Gliese 445)
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