G 99-47

**G 99-47**
	; G 99-47的可見光帶光變曲線
觀測資料; 曆元 J2000
星座	獵戶座
星官
赤經	05h 56m 25.47s
赤緯	+05° 21′ 48.6″
視星等（V）	14.105
特性
光譜分類	DAP8.9
視星等 (B)	14.69
視星等 (V)	14.10
視星等 (R)	14.0
視星等 (I)	13.6
視星等 (J)	12.930 ± 0.022
視星等 (H)	12.720 ± 0.025
視星等 (K)	12.653 ± 0.024
天體測定
自行 (μ)	赤經：-444.685 mas/yr ; 赤緯：-925.140 mas/yr
視差 (π)	123.1989 ± 0.0170 mas
距離	26.474 ± 0.004 ly ; (8.117 ± 0.001 pc)
絕對星等 (MV)	14.59
詳細資料
質量	0.71 ± 0.03 M☉
半徑	0.011 R☉
表面重力 (log g)	8.20 ± 0.05
溫度	5790 ± 110 K
年齡	3.97 Gyr
其他命名
	WD 0553+053, V1201 Ori, LHS 212, LTT 17891, NLTT 15834, G 099-047, GJ 1087, G 102-40, G 106-15, EGGR 290, 2MASS J05562547+0521486, USNO-B1.0 0953-00073703, Gaia DR2 3320184202856027776
參考資料庫
SIMBAD	資料

G 99-47 (獵戶座 V1201)是一顆位於獵戶座光譜分類為DAP8 (DAP8.9,^[4]或DAP8.7^[3])的白矮星。G 99-47為第十近的白矮星，僅次於格利澤293、格利澤518、格利澤915等。

G 99-47的質量約為是6999710000000000000♠0.71±0.03太陽質量;^[3]表面重力為10^{8.20 ± 0.05} (1.58 · 10⁸) cm·s⁻²,^[3]或大概為地球重力的162,000倍，對應半徑7711公里，或地球半徑的121%。溫度約5790K,^[3]幾乎和太陽的一樣；它的冷卻年齡，即退化恆星的年齡（不包括主序星和巨星的壽命）是3.97 Gyr^[4]。由於幾乎等於太陽的溫度，G 99-47應該呈現出與太陽幾乎相同的白色。白矮星具有強磁場，近地表測得的垂直分量為560 T^[7]。

參見

距離25–30光年的恆星列表

註釋

^ From apparent magnitude and parallax.
^ From surface gravity and mass.
^ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

參考資料

^ Brinkworth, Carolyn S.; Burleigh, Matthew R.; Lawrie, Katherine; Marsh, Thomas R.; Knigge, Christian. Measuring the Rotational Periods of Isolated Magnetic White Dwarfs. The Astrophysical Journal. August 2013, 773 (1): 47 [10 February 2022]. Bibcode:2013ApJ...773...47B. S2CID 56285149. doi:10.1088/0004-637X/773/1/47. （原始內容存檔於2023-04-12）.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 V* V1201 Ori -- White Dwarf. Centre de Données astronomiques de Strasbourg. [2011-11-01]. （原始內容存檔於2019-01-09）.
^ ^3.00 ^3.01 ^3.02 ^3.03 ^3.04 ^3.05 ^3.06 ^3.07 ^3.08 ^3.09 ^3.10 ^3.11 Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage. A New Look at the Local White Dwarf Population. The Astronomical Journal. 2008, 135 (4): 1225–1238 [2023-04-11]. Bibcode:2008AJ....135.1225H. S2CID 122855486. doi:10.1088/0004-6256/135/4/1225. （原始內容存檔於2023-04-20）.
^ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic. The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics. The Astronomical Journal. 2009, 138 (6): 1681–1689. Bibcode:2009AJ....138.1681S. S2CID 119284418. arXiv:0910.1288  . doi:10.1088/0004-6256/138/6/1681.
^ ^5.0 ^5.1 ^5.2 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  . 已忽略未知參數|collaboration= (幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^6.0 ^6.1 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995). [2023-04-11]. （原始內容存檔於2023-03-21）.
^ Bagnulo, Stefano; Landstreet, John D., Discovery of six new strongly magnetic white dwarfs in the 20 pc local population, Astronomy & Astrophysics, 2020, 643: A134, S2CID 222290583, arXiv:2010.05795  , doi:10.1051/0004-6361/202038565

[note_1-7] From apparent magnitude and parallax.

[note_2-8] From surface gravity and mass.

[note_3-9] White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

[Brinkworth2013-1] Brinkworth, Carolyn S.; Burleigh, Matthew R.; Lawrie, Katherine; Marsh, Thomas R.; Knigge, Christian. Measuring the Rotational Periods of Isolated Magnetic White Dwarfs. The Astrophysical Journal. August 2013, 773 (1): 47 [10 February 2022]. Bibcode:2013ApJ...773...47B. S2CID 56285149. doi:10.1088/0004-637X/773/1/47. （原始內容存檔於2023-04-12）.

[Simbad-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 V* V1201 Ori -- White Dwarf. Centre de Données astronomiques de Strasbourg. [2011-11-01]. （原始內容存檔於2019-01-09）.

[Holberg2008-3] 3.00 ^3.01 ^3.02 ^3.03 ^3.04 ^3.05 ^3.06 ^3.07 ^3.08 ^3.09 ^3.10 ^3.11 Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage. A New Look at the Local White Dwarf Population. The Astronomical Journal. 2008, 135 (4): 1225–1238 [2023-04-11]. Bibcode:2008AJ....135.1225H. S2CID 122855486. doi:10.1088/0004-6256/135/4/1225. （原始內容存檔於2023-04-20）.

[Sion2009-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic. The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics. The Astronomical Journal. 2009, 138 (6): 1681–1689. Bibcode:2009AJ....138.1681S. S2CID 119284418. arXiv:0910.1288  . doi:10.1088/0004-6256/138/6/1681.

[EDR3-5] 5.0 ^5.1 ^5.2 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  . 已忽略未知參數|collaboration= (幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Yale-6] 6.0 ^6.1 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995). [2023-04-11]. （原始內容存檔於2023-03-21）.

[10] Bagnulo, Stefano; Landstreet, John D., Discovery of six new strongly magnetic white dwarfs in the 20 pc local population, Astronomy & Astrophysics, 2020, 643: A134, S2CID 222290583, arXiv:2010.05795  , doi:10.1051/0004-6361/202038565

[4]

[3]

[1]

[2]

[5]

[6]

[note 1]

[note 2]

[note 3]

[7]

觀測資料曆元 J2000^[2]
G 99-47的可見光帶光變曲線^[1]
星座	獵戶座
星官
赤經	05^h 56^m 25.47^s^[2]
赤緯	+05° 21′ 48.6″^[2]
視星等（V）	14.105^[3]
特性
光譜分類	DAP8.9^[4]
視星等 (B)	14.69^[2]
視星等 (V)	14.10^[2]
視星等 (R)	14.0^[2]
視星等 (I)	13.6^[2]
視星等 (J)	12.930 ± 0.022^[2]
視星等 (H)	12.720 ± 0.025^[2]
視星等 (K)	12.653 ± 0.024^[2]
天體測定

自行 (μ)	赤經：-444.685^[5] mas/yr 赤緯：-925.140^[5] mas/yr
視差 (π)	123.1989 ± 0.0170^[5] mas
距離	26.474 ± 0.004 ly (8.117 ± 0.001 pc)
絕對星等 (M_V)	14.59^[3]^[6]^{[note 1]}

詳細資料

質量	0.71 ± 0.03^[3] M_☉
半徑	0.011^[3]^{[note 2]} R_☉
表面重力 (log g)	8.20 ± 0.05^[3]
溫度	5790 ± 110^[3] K
年齡	3.97^[4]^{[note 3]} Gyr

其他命名
WD 0553+053,^[3]^[4] V1201 Ori,^[2] LHS 212,^[3] LTT 17891,^[2] NLTT 15834,^[2] G 099-047,^[6] GJ 1087,^[2] G 102-40,^[2] G 106-15,^[2] EGGR 290,^[2] 2MASS J05562547+0521486,^[2] USNO-B1.0 0953-00073703, Gaia DR2 3320184202856027776^[2]
參考資料庫
SIMBAD	資料