壘壁陣三
 Gamma Capricorni is at left center. | |
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 摩羯座 |
| 星官 | 室宿 垒壁阵 |
| 赤經 | 21h 40m 05.4563s[1] |
| 赤緯 | −16° 39′ 44.308″[1] |
| 視星等（V） | +3.69 |
| 特性 | |
| 光谱分类 | F0p[2] |
| U−B 色指数 | +0.22[3] |
| B−V 色指数 | +0.32[3] |
| 天体测定 | |
| 徑向速度 (Rv) | −31.2[4] km/s |
| 自行 (μ) | 赤经：187.39[1] mas/yr 赤纬：−22.33[1] mas/yr |
| 视差 (π) | 23.48 ± 1.10[1] mas |
| 距离 | 139 ± 7 ly (43 ± 2 pc) |
| 詳細資料 | |
| 表面重力 (log g) | 3.95[5] |
| 溫度 | 7,520[5] K |
| 金屬量 | [5] |
| 自轉速度 (v sin i) | 40[6] km/s |
| 其他命名 | |
![{\displaystyle {\begin{smallmatrix}\left[{\frac {Fe}{H))\right]\ =\ 0.5\end{smallmatrix))}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7645a6e138b91e6d391d7ddf33a44b92a3b5e2ce)
垒壁阵三（γ Cap / 摩羯座γ）是摩羯座的巨星。其俗名Nashira来自阿拉伯语نشرة ，意为“捷报者”。由于靠近黄道，垒壁阵三可能被月亮和行星（很少）遮挡。垒壁阵三是蓝-白A型（A7III）巨星，标准视亮度为+3.69，离地球大约139光年。它是猎犬座α²变星，亮度变化0.03星等。
参考文献
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. July 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ 2.0 2.1 HD 206088 -- Variable Star of alpha2 CVn type. SIMBAD. Centre de Données astronomiques de Strasbourg. [2009-11-12]. （原始内容存档于2016-08-05）.
- ^ 3.0 3.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer. General catalogue of stellar radial velocities. Carnegie Institution of Washington. 1953 [2007-05-14]. （原始内容存档于2018-10-05）.
- ^ 5.0 5.1 5.2 Burkhart, C.; Coupry, M. F. The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe. Astronomy and Astrophysics. September 1991, 249 (1): 205−216. Bibcode:1991A&A...249..205B.
- ^ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i. Astronomy and Astrophysics. October 2002, 393: 897–911. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
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