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**天津增十九(天鵝座52)**
	天津增十九的位置 (紅圈處)
观测数据; 曆元 J2000 分點 J2000
星座	天鵝座
	A
赤經	20h 45m 39.75304s
赤緯	+30° 43′ 10.9756″
視星等 (V)	4.22
	B
赤經	20h 45m 40.206s
赤緯	+30° 43′ 12.96″
視星等 (V)	11.06
特性
光谱分类	G9.5III
U−B 色指数	+0.88
B−V 色指数	+1.05
天体测定
徑向速度 (Rv)	–0.72 km/s
自行 (μ)	赤经：–8.98 mas/yr ; 赤纬：+24.11 mas/yr
视差 (π)	16.22 ± 0.19 mas
距离	201 ± 2 ly ; (61.7 ± 0.7 pc)
詳細資料
質量	2.07 M☉
半徑	13.81 R☉
表面重力 (log g)	2.5
亮度	89 L☉
溫度	4,677 K
金属量 [Fe/H]	−0.24 dex
自轉速度 (v sin i)	3.7 km/s
年齡	2.27 Gyr
其他命名
	ADS 14259，BD+30 4167， WDS J20456+3043，CCDM J20457+3043
參考資料庫
SIMBAD	A
	B

天津增十九 (天鵝座52)是在北半球天鵝座的一顆巨星，視星等為4.22等。根據依巴谷衛星的視差，它的距離大約是291光年（89秒差距）遠。

天津增十九很可能是水平分支上的紅團簇星，它的核心融合了氫，然而還有25%的可能性仍是紅巨星分支(RGB)上的恆星，氫融合只在核心周圍的氫殼層進行。如果是紅團簇星，它的年齡高達22.7億歲，但如果只是RGB星，則只有9.1億歲^[6]。在4,677K的有效溫度下，它的光度大約是90 L_☉^[7]，它的半徑大約是14 R_☉^[6]。

天津增十九有一顆黯淡的9.5等伴星，與主星的角距離為6角秒^[4]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 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 Vizier catalog entry （页面存档备份，存于互联网档案馆）
^ ^2.0 ^2.1 ^2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data. SIMBAD, 1986, Bibcode:1986EgUBV........0M
^ ^3.0 ^3.1 ^3.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. 2000, 355: L27. Bibcode:2000A&A...355L..27H.
^ ^4.0 ^4.1 Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869. Bibcode:2008MNRAS.389..869E. S2CID 14878976. arXiv:0806.2878 . doi:10.1111/j.1365-2966.2008.13596.x.
^ Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, S2CID 17804304, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272
^ ^6.0 ^6.1 ^6.2 ^6.3 ^6.4 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas. Precise radial velocities of giant stars. Astronomy & Astrophysics. 2015, 574: A116. Bibcode:2015A&A...574A.116R. S2CID 59334290. arXiv:1412.4634 . doi:10.1051/0004-6361/201322360.
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 Massarotti, Alessandro; et al, Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity, The Astronomical Journal, January 2008, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209

[van_Leeuwen2007-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 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 Vizier catalog entry （页面存档备份，存于互联网档案馆）

[MERMILLIOD-2] 2.0 ^2.1 ^2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data. SIMBAD, 1986, Bibcode:1986EgUBV........0M

[tycho2-3] 3.0 ^3.1 ^3.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. 2000, 355: L27. Bibcode:2000A&A...355L..27H.

[Eggleton-4] 4.0 ^4.1 Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869. Bibcode:2008MNRAS.389..869E. S2CID 14878976. arXiv:0806.2878 . doi:10.1111/j.1365-2966.2008.13596.x.

[aaa430_165-5] Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, S2CID 17804304, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272

[reffert-6] 6.0 ^6.1 ^6.2 ^6.3 ^6.4 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas. Precise radial velocities of giant stars. Astronomy & Astrophysics. 2015, 574: A116. Bibcode:2015A&A...574A.116R. S2CID 59334290. arXiv:1412.4634 . doi:10.1051/0004-6361/201322360.

[aj135_1_209-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 Massarotti, Alessandro; et al, Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity, The Astronomical Journal, January 2008, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209

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