LP 658-2是一颗位于猎户座的白矮星。[1] 视星等大约14.488。[2]

LP 658-2
观测资料
历元 J2000.0
星座 猎户座
星官
赤经 05h 55m 09.53s[1]
赤纬 −04° 10′ 07.1″[1]
视星等(V) 14.488[2]
特性
光谱分类DZ11.8[2]
视星等 (B)15.49[1]
视星等 (V)14.488[2]
视星等 (RKC)13.99[3]
视星等 (IKC)13.51[3]
视星等 (J)13.05 ± 0.03[3]
视星等 (H)12.86 ± 0.03[3]
视星等 (KS)12.78 ± 0.03[3]
B−V 色指数1.0[1][2]
天体测定
自行 (μ) 赤经:535.249±0.017[4] mas/yr
赤纬:−2317.011±0.015[4] mas/yr
视差 (π)155.2373 ± 0.0175[4] mas
距离21.010 ± 0.002 ly
(6.4418 ± 0.0007 pc)
绝对星等 (MV)15.44 ± 0.03[3]
详细资料 [2]
From Holberg etal. (2008)
质量0.45±0.01 M
半径0.014[2][note 1] R
表面重力 (log g)7.80±0.02[2]
温度4,270±70,[2] K
年龄6.42[5] Gyr
其他命名
GJ 223.2, GJ 9193, HL 4, LHS 32, LP 658-2, NLTT 15811, G 099-044[6] , G 99-44, G 106-12, WD 0552–041, EGGR 45.[1]
参考资料库
SIMBAD资料

距离

根据2009年的一篇论文,它是距离太阳最近的第八颗已知白矮星(仅次于天狼星B南河三B范马南星GJ 440波江座40B施泰因2051BG 240-72)。[7]

物理参数

颜色

尽管它被归类为“白”矮星,但由于温度比太阳低,可与橙矮星相媲美,因此它看起来是黄白色而不是白色。

注释

  1. ^ From surface gravity and mass.

参考

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 GJ 223.2. SIMBAD. 斯特拉斯堡天文资料中心. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Holberg, J. B.; Sion, E. M.; Oswalt, T.; McCook, G. P.; Foran, S.; Subasavage, John P. A new look at the local white dwarf population. The Astronomical Journal. 1 April 2008, 135 (4): 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225 . 
  3. ^ 3.0 3.1 3.2 3.3 3.4 3.5 Subasavage, John P.; Jao, Wei-Chun; Henry, Todd J.; Bergeron, P.; Dufour, P.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. The solar neighborhood. XXI. Parallax results from the CTIOPI 0.9 m program: 20 new members of the 25 parsec white dwarf sample. The Astronomical Journal. 1 June 2009, 137 (6): 4547–4560. Bibcode:2009AJ....137.4547S. S2CID 14696597. arXiv:0902.0627 . doi:10.1088/0004-6256/137/6/4547. 
  4. ^ 4.0 4.1 4.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 .  已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ Sion, Edward M.; Holberg, J. B.; Oswalt, Terry D.; McCook, George P.; Wasatonic, Richard. The white dwarfs within 20 parsecs of the Sun: kinematics and statistics. The Astronomical Journal. 1 December 2009, 138 (6): 1681–1689. Bibcode:2009AJ....138.1681S. S2CID 119284418. arXiv:0910.1288 . doi:10.1088/0004-6256/138/6/1681. 
  6. ^ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. The General Catalogue of Trigonometric [Stellar] Parallaxes 4th. New Haven, CT: Yale University Observatory. 1995. Bibcode:1995gcts.book.....V.  VizieR entry页面存档备份,存于互联网档案馆).
  7. ^ Table 1 in Sion et al. 2009