厕增六
厕增六，即天兔座η（Eta Leporis、Eta Lep、η Leporis、η Lep）是一個位於天兔座的黃-白矮星[1]。它的視星等3.719[1]。史匹哲太空望遠鏡的紅外攝譜儀觀測到該恆星旁有紅外過量的情形，相關模型則顯示有星周盤存在於該恆星周圍1到16光年處 [6]。
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 天兔座 |
| 星官 | 参宿 厕 |
| 赤經 | 05h 56m 24.2929s[1] |
| 赤緯 | −14° 10′ 03.721″[1] |
| 視星等（V） | 3.719[1] |
| 特性 | |
| 光谱分类 | F2V[1] |
| U−B 色指数 | +0.01[2] |
| B−V 色指数 | +0.33[2] |
| R−I 色指数 | +0.16[2] |
| 天体测定 | |
| 徑向速度 (Rv) | −2.4 ± 0.9[1] km/s |
| 自行 (μ) | 赤经：−42.23[1] mas/yr 赤纬：139.02[1] mas/yr |
| 视差 (π) | 66.47 ± 0.74[1] mas |
| 距离 | 49.1 ± 0.5 ly (15 ± 0.2 pc) |
| 绝对星等 (MV) | 2.83[3] |
| 詳細資料 | |
| 質量 | 1.42 (1.38 to 1.47)[4] M☉ |
| 半徑 | 1.5[5] R☉ |
| 溫度 | 6900[4] K |
| 金屬量 | [Fe/H] = −0.25[4] |
| 自轉速度 (v sin i) | 17[4] km/s |
| 年齡 | 1.8 (1.5 to 1.9) × 109[4] 年 |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | data |
參考資料
- * eta Lep -- Star, database entry, SIMBAD. Accessed on line February 3, 2011.
- HR 2085, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 3, 2011.
- From apparent magnitude and parallax.
- HD 40136, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 3, 2011.
- HD 40136, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 3, 2011.
- Table 7, Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars, S. M. Lawler et al., The Astrophysical Journal 705, #1 (November 2009), pp. 89-111, doi:10.1088/0004-637X/705/1/89, Bibcode：2009ApJ...705...89L.
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