LP 658-2

**LP 658-2**
觀測資料; 曆元 J2000.0
星座	獵戶座
星官
赤經	05h 55m 09.53s
赤緯	−04° 10′ 07.1″
視星等（V）	14.488
特性
光谱分类	DZ11.8
视星等 (B)	15.49
视星等 (V)	14.488
视星等 (RKC)	13.99
视星等 (IKC)	13.51
视星等 (J)	13.05 ± 0.03
视星等 (H)	12.86 ± 0.03
视星等 (KS)	12.78 ± 0.03
B−V 色指数	1.0
天体测定
自行 (μ)	赤经：535.249±0.017 mas/yr ; 赤纬：−2317.011±0.015 mas/yr
视差 (π)	155.2373 ± 0.0175 mas
距离	21.010 ± 0.002 ly ; (6.4418 ± 0.0007 pc)
绝对星等 (MV)	15.44 ± 0.03
詳細資料
From Holberg etal. (2008)
質量	0.45±0.01 M☉
半徑	0.014 R☉
表面重力 (log g)	7.80±0.02
溫度	4,270±70, K
年齡	6.42 Gyr
其他命名
	GJ 223.2, GJ 9193, HL 4, LHS 32, LP 658-2, NLTT 15811, G 099-044 , G 99-44, G 106-12, WD 0552–041, EGGR 45.
參考資料庫
SIMBAD	资料

天球赤道座標： 05^h 55^m 09.53^s，−04° 10′ 07.1″

LP 658-2是一顆位於獵戶座的白矮星。^[1] 視星等大約14.488。^[2]

距離[编辑]

根據2009年的一篇論文，它是距離太陽最近的第八顆已知白矮星（僅次於天狼星B、南河三B、范馬南星、GJ 440、波江座40B、施泰因2051B和G 240-72）。^[7]

物理參數[编辑]

顏色[编辑]

儘管它被歸類為“白”矮星，但由於溫度比太陽低，可與橙矮星相媲美，因此它看起來是黃白色而不是白色。

註釋[编辑]

^ From surface gravity and mass.

參考[编辑]

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 GJ 223.2. SIMBAD. 斯特拉斯堡天文資料中心.
^ ^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 .
^ ^3.0 ^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.
^ ^4.0 ^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.
^ 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.
^ 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）.
^ Table 1 in Sion et al. 2009

[note_1-5] From surface gravity and mass.

[sb0-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 GJ 223.2. SIMBAD. 斯特拉斯堡天文資料中心.

[Holberg2008-2] 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 .

[Subasavage2009-3] 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.

[GaiaEDR3-4] 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.

[Sion2009-6] 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.

[Yale-7] 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）.

[8] Table 1 in Sion et al. 2009

[1]

[2]

[3]

[4]

[note 1]

[5]

[6]

[7]

觀測資料曆元 J2000.0
星座	獵戶座
星官
赤經	05^h 55^m 09.53^s^[1]
赤緯	−04° 10′ 07.1″^[1]
視星等（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 (R_KC)	13.99^[3]
视星等 (I_KC)	13.51^[3]
视星等 (J)	13.05 ± 0.03^[3]
视星等 (H)	12.86 ± 0.03^[3]
视星等 (K_S)	12.78 ± 0.03^[3]
B−V 色指数	1.0^[1]^[2]
天体测定

自行 (μ)	赤经：7002535249000000000♠535.249±0.017^[4] mas/yr 赤纬：2996768298900000000♠−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 (M_V)	15.44 ± 0.03^[3]

詳細資料 ^{^[2]}
From Holberg etal. (2008)
質量	6999450000000000000♠0.45±0.01 M_☉
半徑	0.014^[2]^{[note 1]} R_☉
表面重力 (log g)	7000780000000000000♠7.80±0.02^[2]
溫度	7003427000000000000♠4,270±70,^[2] K
年齡	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]
參考資料庫
SIMBAD	资料