玉夫座ι
玉夫座ι，拉丁化為Iota Sculptoris，縮寫為ι Scl，是在南天星座玉夫座的一顆孤獨的恆星[11]。它是一個昏暗的橙色光點，視星等為5.18，肉眼可見[2]。根據視差，這顆恆星距離太陽約336光年[1]，並且正以+21公里/秒的徑向速度遠離中[6]。
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 玉夫座 |
| 星官 | |
| 赤經 | 00h 21m 31.19799s[1] |
| 赤緯 | -28° 58′ 53.2957″[1] |
| 視星等（V） | 5.18[2] |
| 特性 | |
| 光譜分類 | K0III[3] |
| U−B 色指數 | +0.84[4] |
| B−V 色指數 | +1.00[5] |
| 天體測定 | |
| 徑向速度 (Rv) | +20.60[6] km/s |
| 自行 (μ) | 赤經：+33.263[1] mas/yr 赤緯：-72.065[1] mas/yr |
| 視差 (π) | 9.7081 ± 0.1287[1] mas |
| 距離 | 336 ± 4 ly (103 ± 1 pc) |
| 絕對星等 (MV) | 0.16[2] |
| 詳細資料 | |
| 質量 | 2.94[7] M☉ |
| 半徑 | 12.28[7] R☉ |
| 表面重力 (log g) | 2.48[8] |
| 亮度 | 97[7] L☉ |
| 溫度 | 5,020[7] K |
| 金屬量 [Fe/H] | +0.09[2] dex |
| 自轉速度 (v sin i) | 3.1[9] km/s |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
這是一顆衰老的巨星，其恆星分類為K0III[3]，現時位於赫羅圖的紅巨星分支[7]。它的質量是太陽質量的2.9倍，並且已經膨脹到太陽半徑的12倍。這顆恆星在5020 K的有效溫度下，從其擴大的光球層輻射出97倍於太陽的光度[7]。這顆恆星的座標位置是 X射線發射的來源，因此最有可能（99.4%的幾率）是X射線的發射源[12]。
參考資料
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365
. doi:10.1051/0004-6361/201833051. VizieR中此天體在蓋亞望遠鏡第二批數據發布的記錄
- ^ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015. Vizier catalog entry （頁面存檔備份，存於網際網路檔案館）
- ^ 3.0 3.1 Houk, N. Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. 1982. Bibcode:1982mcts.book.....H.
- ^ Mermilliod, J. C. VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991). VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2006, 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry （頁面存檔備份，存於網際網路檔案館）
- ^ Mallama, A. Sloan Magnitudes for the Brightest Stars. The Journal of the American Association of Variable Star Observers. 2014, 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^ 6.0 6.1 Wilson, R. E. General Catalogue of Stellar Radial Velocities. Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). 1953. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. Astronomy & Astrophysics. 2011, 536: A71. Bibcode:2011A&A...536A..71J. S2CID 55769003. arXiv:1110.6459 . doi:10.1051/0004-6361/201117887. Vizier catalog entry
- ^ Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 . Vizier catalog entry （頁面存檔備份，存於網際網路檔案館）
- ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. A catalog of rotational and radial velocities for evolved stars. Astronomy & Astrophysics. 2014, 561: A126. Bibcode:2014A&A...561A.126D. S2CID 54046583. arXiv:1312.3474 . doi:10.1051/0004-6361/201220762. Vizier catalog entry （頁面存檔備份，存於網際網路檔案館）
- ^ iot Scl. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. September 2008, 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. S2CID 14878976. arXiv:0806.2878 . doi:10.1111/j.1365-2966.2008.13596.x .
- ^ Haakonsen, Christian Bernt; Rutledge, Robert E. XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources. The Astrophysical Journal Supplement. September 2009, 184 (1): 138–151. Bibcode:2009ApJS..184..138H. S2CID 119267456. arXiv:0910.3229 . doi:10.1088/0067-0049/184/1/138.
