糠 (恒星) 提示：此条目介绍的是蛇夫座d，请勿将其与蛇夫座δ混淆。 糠（蛇夫座45） 糠（蛇夫座45）（紅圈） 觀測資料 曆元 J2000 星座 蛇夫座 星官 糠（箕宿） 赤經 17h 27m 21.27571s[1] 赤緯 -29° 52′ 01.3262″[1] 視星等（V） 4.28[2] 特性 光谱分类 F5III-IV[3] U−B 色指数 +0.11[4] B−V 色指数 +0.40[4] 天体测定 徑向速度 (Rv) +38.00[5] km/s 自行 (μ) 赤经：+17.08[1] mas/yr 赤纬：−138.02[1] mas/yr 视差 (π) 29.23 ± 0.20[1] mas 距离 111.6 ± 0.8 ly (34.2 ± 0.2 pc) 绝对星等 (MV) 1.61[2] 詳細資料 質量 1.71[6] M☉ 半徑 3.2[6] R☉ 表面重力 (log g) 3.67[6] 亮度 19.07[2] L☉ 溫度 6,750[7] K 金属量 [Fe/H] +0.10[7] dex 自轉速度 (v sin i) 65.4[8] km/s 年齡 7000124000000000000♠1.24±0.18[7] Gyr 其他命名 d Oph、​45 Oph、​CD−29 135575、​FK5 646、​GC 23627、​HD 157919、​HIP 85423、​HR 6492、​SAO 185412[9] 參考資料庫 SIMBAD 资料 糠（蛇夫座45）是在天球赤道星座蛇夫座的一顆孤獨、緊鄰著南側天蠍座邊界的恆星[10]。它有拜耳名稱「蛇夫座d」，而「蛇夫座45」是它的佛氏名稱。在過去，它被命名為望遠鏡座θ[11]。這個天體肉眼可見，是一顆微弱的黃白色恆星，視星等為4.28等[2]。根據恆星視差，它距離太陽約111.6 光年[1]。這顆恆星正以+38公里/秒的徑向速度遠離地球[5]。 這個天體的恆星分類為F5III-IV[3]，對F型恆星與光度進行匹配，顯示出次巨星和巨星的混合特徵。它是顆年齡12億[7]，質量是1.7太陽質量[6]，和半徑是3.2倍太陽半徑[6]。這顆恆星正從其光球以6,7505 K的有效溫度輻射出的光度是19倍太陽光度[2][7]。它以65公里/秒的預計轉速旋轉[8]。 參考文獻 ^ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.  Vizier catalog entry ^ 2.0 2.1 2.2 2.3 2.4 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 ^ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample. The Astronomical Journal. 2006, 132 (1): 161–170. Bibcode:2006AJ....132..161G. S2CID 119476992. arXiv:astro-ph/0603770 . doi:10.1086/504637.  ^ 4.0 4.1 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 ^ 5.0 5.1 Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. S2CID 119231169. arXiv:1606.08053 . doi:10.1134/S1063773706110065.  ^ 6.0 6.1 6.2 6.3 6.4 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 ^ 7.0 7.1 7.2 7.3 7.4 Pace, G. Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram. Astronomy & Astrophysics. March 2013, 551: 4. Bibcode:2013A&A...551L...8P. S2CID 56420519. arXiv:1301.5651 . doi:10.1051/0004-6361/201220364. L8.  ^ 8.0 8.1 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 ^ d Oph. 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 .  ^ Ian Ridpath. Telescopium - The Telescope. Ian Ridpath's Star Tales. [2019-06-23].

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