天市左垣十

天市左垣十(巨蛇座ξ)也稱南海，又名BD-15 4621，HD 159876、SAO 160700、HR 6561，是巨蛇座的三合星系統^[10]，視星等為3.54，其B1900.0坐標為赤經17^h 37^m 35.19983^s，赤緯-15° 23′ 54.7940″。

天市左垣十

觀測資料 曆元 J2000.0
星座	巨蛇座
星官
赤經	17h 37m 35.19983s[1]
赤緯	-15° 23′ 54.7940″[1]
視星等（V）	3.54[2]
特性
光譜分類	A9 IIIp Sr[3]
U−B 色指數	+0.12[2]
B−V 色指數	+0.27[2]
天體測定
徑向速度 (Rv)	2998572000000000000♠−42.8±0.7[4] km/s
自行 (μ)	赤經：−42.10[1] mas/yr 赤緯：−59.94[1] mas/yr
視差 (π)	30.98 ± 0.19[1] mas
距離	105.3 ± 0.6 ly (32.3 ± 0.2 pc)
絕對星等 (MV)	+1.00[5]
軌道[6]
繞行週期 (P)	2.2923 d
偏心率 (e)	0.00
近心點 曆元 (T)	2419210.191 JD
半振幅 (K1) (primary)	19.4 km/s
詳細資料
ξ Ser Aa
質量	2.06[7] M☉
表面重力 (log g)	3.55[3]
亮度	30.6[8] L☉
溫度	7003721700000000000♠7,217±41[7] K
金屬量 [Fe/H]	+0.07[3] dex
自轉速度 (v sin i)	54[9] km/s
年齡	1.03[7] Gyr
ξ Ser Ab
質量	0.18[10] M☉
其他命名
55 Serpentis, BD−15° 4621, HD 159876, HIP 86263, HR 6561, SAO 160700.[11]
參考資料庫
SIMBAD	資料

參考文獻

1. van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
2. Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV data (SIMBAD), 1986, Bibcode:1986EgUBV........0M.
3. Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.
4. de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
5. Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
6. Pourbaix, D.; et al, SB9: The ninth catalogue of spectroscopic binary orbits, Astronomy and Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
7. Luck, R. Earle, Abundances in the Local Region. I. G and K Giants, The Astronomical Journal, 2015, 150 (3): 88, Bibcode:2015AJ....150...88L, arXiv:1507.01466 , doi:10.1088/0004-6256/150/3/88.
8. McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
9. Royer, F.; et al, Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i, Astronomy and Astrophysics, October 2002, 393: 897−911, Bibcode:2002A&A...393..897R, arXiv:astro-ph/0205255 , doi:10.1051/0004-6361:20020943.
10. Tokovinin, A.; et al, Tertiary companions to close spectroscopic binaries, Astronomy and Astrophysics, May 2006, 450 (2): 681–69, Bibcode:2006A&A...450..681T, arXiv:astro-ph/0601518 , doi:10.1051/0004-6361:20054427.
11. ksi Ser -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-03-23], （原始內容存檔於2019-08-09）.