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**小馬座λ(λ Equulei)**
觀測資料; 曆元 J2000.0
星座	小馬座
星官
赤經	21h 02m 12.50262s
赤緯	+07° 10′ 47.1545″
視星等（V）	6.698 (7.41 + 7.64)
特性
光谱分类	F6V
天体测定
徑向速度 (Rv)	−4.8±1.6 km/s
绝对星等 (MV)	2.16±0.18
天体测定
A
自行 (μ)	赤经：−9.184 mas/yr ; 赤纬：−12.915 mas/yr
视差 (π)	8.8125 ± 0.2481 mas
距离	370 ± 10 ly ; (113 ± 3 pc)
B
自行 (μ)	赤经：−4.238 mas/yr ; 赤纬：−17.934 mas/yr
视差 (π)	8.5577 ± 0.0298 mas
距离	380 ± 10 ly ; (116.9 ± 0.4 pc)
詳細資料
2 Equ A
質量	1.73 M☉
半徑	3.37 R☉
表面重力 (log g)	4.05
亮度	13.087 L☉
溫度	6,561±80 K
金属量 [Fe/H]	0.17 dex
年齡	1.6 Gyr
2 Equ B
半徑	2.74 R☉
亮度	10.828 L☉
溫度	6,330 K
其他命名
	λ Equ、2 Equulei、BD+06° 4731、HD 200256、HIP 103813、LTT 16227、SAO 126482
參考資料庫
SIMBAD	资料

小馬座λ是在星座小馬座的一對雙星。

小馬座λ的主星是一顆F型主序星。在2015年，伴星相對於主星的角距離為 7000290000000000000♠2.90 角秒，位置角為 213°^[3]。它們形成一對有著共同的自行對，兩顆恒星的距離大致相同，運動方向也相同^[4]。蓋亞EDR3提供的視差值分別為7000881250000000000♠8.8125±0.2471 毫角秒和7000855770000000000♠8.5577±0.0298 毫角秒，然而它們被標記為可能不可靠^[6]^[7]。這樣的視差對應於大約7018359507757958070♠380 ly的距離，而對於成對的這兩顆恒星來說，與依巴谷衛星的7018245978992287100♠260±20 ly形成鮮明的對比^[1]。

參考資料

^ ^1.0 ^1.1 ^1.2 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.
^ ^2.0 ^2.1 Holmberg, J.; et al, The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics, Astronomy and Astrophysics, July 2009, 501 (3): 941–947, Bibcode:2009A&A...501..941H, S2CID 118577511, arXiv:0811.3982 , doi:10.1051/0004-6361/200811191.
^ ^3.0 ^3.1 Mason, B. D.; et al, The Washington Visual Double Star Catalog, The Astronomical Journal, 2014, 122 (6): 3466 [2015-07-22], Bibcode:2001AJ....122.3466M, doi:10.1086/323920 , （原始内容存档于2019-07-04）
^ ^4.0 ^4.1 Abt, Helmut A. Visual Multiples. IX. MK Spectral Types. The Astrophysical Journal Supplement Series. 2008, 176 (1): 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529 .
^ ^5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 Casagrande, L.; et al, New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey, Astronomy & Astrophysics, 2011, 530 (A138): 21, Bibcode:2011A&A...530A.138C, S2CID 56118016, arXiv:1103.4651 , doi:10.1051/0004-6361/201016276.
^ ^6.0 ^6.1 ^6.2 ^6.3 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.
^ ^7.0 ^7.1 ^7.2 ^7.3 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.
^ ^8.0 ^8.1 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中此天体在盖亚望远镜第二批数据发布的记录
^ ^9.0 ^9.1 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中此天体在盖亚望远镜第二批数据发布的记录
^ 2 Equ -- Double or multiple star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-02-17], （原始内容存档于2021-09-30）.

[vanLeeuwen2007-1] 1.0 ^1.1 ^1.2 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.

[Holmberg2009-2] 2.0 ^2.1 Holmberg, J.; et al, The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics, Astronomy and Astrophysics, July 2009, 501 (3): 941–947, Bibcode:2009A&A...501..941H, S2CID 118577511, arXiv:0811.3982 , doi:10.1051/0004-6361/200811191.

[WDSC2014-3] 3.0 ^3.1 Mason, B. D.; et al, The Washington Visual Double Star Catalog, The Astronomical Journal, 2014, 122 (6): 3466 [2015-07-22], Bibcode:2001AJ....122.3466M, doi:10.1086/323920 , （原始内容存档于2019-07-04）

[abt-4] 4.0 ^4.1 Abt, Helmut A. Visual Multiples. IX. MK Spectral Types. The Astrophysical Journal Supplement Series. 2008, 176 (1): 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529 .

[Casagrande2011-5] 5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 Casagrande, L.; et al, New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey, Astronomy & Astrophysics, 2011, 530 (A138): 21, Bibcode:2011A&A...530A.138C, S2CID 56118016, arXiv:1103.4651 , doi:10.1051/0004-6361/201016276.

[edr3a-6] 6.0 ^6.1 ^6.2 ^6.3 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.

[edr3b-7] 7.0 ^7.1 ^7.2 ^7.3 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.

[dr2a-8] 8.0 ^8.1 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中此天体在盖亚望远镜第二批数据发布的记录

[dr2b-9] 9.0 ^9.1 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中此天体在盖亚望远镜第二批数据发布的记录

[SIMBAD-10] 2 Equ -- Double or multiple star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-02-17], （原始内容存档于2021-09-30）.

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小马座λ

參考資料