郎位一

**郎位一（γ Comae Berenices）**
觀測資料; 曆元 J2000.0
星座	后髮座
星官	郎位（太微垣）
赤經	12h 26m 56.27207s
赤緯	+28° 16′ 06.3211″
視星等（V）	4.36
特性
光譜分類	K1 III Fe0.5
U−B 色指數	+1.16
B−V 色指數	+1.13
R−I 色指數	+0.51
天體測定
徑向速度 (Rv)	+3.38±0.11 km/s
自行 (μ)	赤經：−83.990 ± 0.418 mas/yr ; 赤緯：−82.216 ± 0.345 mas/yr
視差 (π)	19.2552 ± 0.2371 mas
距離	169 ± 2 ly ; (51.9 ± 0.6 pc)
絕對星等 (MV)	0.76
詳細資料
質量	1.65±0.18 M☉
半徑	11.76±0.14 R☉
表面重力 (log g)	2.53±0.05
亮度	58.2±1.1 L☉
溫度	4,652±18 K
金屬量 [Fe/H]	0.16±0.10 dex
自轉速度 (v sin i)	≤ 17 km/s
年齡	2.72±0.78 Gyr
其他命名
	γ Com、15 Comae Berenices、BD+29° 2288、FK5 2999、GC 16964、HD 108381、HIP 60742、HR 4737、SAO 82313、PPM 101903
參考資料庫
SIMBAD	資料

郎位一（英語：Gamma Comae Berenices），英文名稱來自拉丁文的γ Comae Berenices，是在星座后髮座的一顆單獨^[10]的橙色恆星。它的光度以肉眼隱約可見，視星等為4.36等^[2]。基於從地球上觀察每年19.50mas的視差，估計它與太陽的距離大約為167光年。這顆恆星正以+3公里/秒的徑向速度遠離太陽^[5]。

這是一顆演化中的K型巨星，恆星分類為K1 III Fe0.5^[3]。後綴符號Fe表示這顆恆星在其光譜中顯示出過多的鐵。它最有可能（91%的幾率）在水平分支上，年齡為27億年。如果這是正確的，那麼估計它的質量是太陽質量的1.65倍，並且半徑已經膨脹到太陽半徑的近12倍。這顆恆星表面的有效溫度約為4,652 K，從其擴大的光球輻射出58倍於太陽的光度^[8]。郎位一的位置在後髮星團的區域內，但是它實際上可能不是這個星團的成員^[11]。

參考資料

^ ^1.0 ^1.1 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 ^2.2 ^2.3 Haupt, H. F.; Schroll, A., Photoelektrische Photometrie von Shell-Sternen, Astronomy and Astrophysics Supplement Series, 1974, 15: 311, Bibcode:1974A&AS...15..311H.
^ ^3.0 ^3.1 Keenan, Philip C; McNeil, Raymond C, The Perkins catalog of revised MK types for the cooler stars, Astrophysical Journal Supplement Series, 1989, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
^ ^4.0 ^4.1 Hoffleit, D.; Warren, Jr., W. H., HR 4737 database entry, The Bright Star Catalogue 5th Revised (Preliminary Version), [2024-04-16], （原始內容存檔於2020-10-03）
^ ^5.0 ^5.1 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 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中此天體在蓋亞望遠鏡第二批數據發佈的記錄
^ Hekker, S.; et al, Precise radial velocities of giant stars. I. Stable stars, Astronomy and Astrophysics, August 2006, 454 (3): 943–949, Bibcode:2006A&A...454..943H, S2CID 119529768, arXiv:astro-ph/0604502 , doi:10.1051/0004-6361:20064946
^ ^8.0 ^8.1 Reffert, Sabine; et al, Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity, Astronomy and Astrophysics, 2015, 574A (2): 116–129, Bibcode:2015A&A...574A.116R, S2CID 59334290, arXiv:1412.4634 , doi:10.1051/0004-6361/201322360.
^ * gam Com -- Star in Cluster, database entry, SIMBAD. Accessed on line October 12, 2010.
^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
^ Tonkin, Stephen F., Binocular astronomy, Springer: 124, 2007, ISBN 978-1-84628-308-6.

[vanLeeuwen2007-1] 1.0 ^1.1 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.

[haupt1974-2] 2.0 ^2.1 ^2.2 ^2.3 Haupt, H. F.; Schroll, A., Photoelektrische Photometrie von Shell-Sternen, Astronomy and Astrophysics Supplement Series, 1974, 15: 311, Bibcode:1974A&AS...15..311H.

[perkins1989-3] 3.0 ^3.1 Keenan, Philip C; McNeil, Raymond C, The Perkins catalog of revised MK types for the cooler stars, Astrophysical Journal Supplement Series, 1989, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[bsc1-4] 4.0 ^4.1 Hoffleit, D.; Warren, Jr., W. H., HR 4737 database entry, The Bright Star Catalogue 5th Revised (Preliminary Version), [2024-04-16], （原始內容存檔於2020-10-03）

[aaa430_165-5] 5.0 ^5.1 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

[Gaia-DR2-6] 6.0 ^6.1 ^6.2 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中此天體在蓋亞望遠鏡第二批數據發佈的記錄

[aaa454_3_943-7] Hekker, S.; et al, Precise radial velocities of giant stars. I. Stable stars, Astronomy and Astrophysics, August 2006, 454 (3): 943–949, Bibcode:2006A&A...454..943H, S2CID 119529768, arXiv:astro-ph/0604502 , doi:10.1051/0004-6361:20064946

[Reffert2015-8] 8.0 ^8.1 Reffert, Sabine; et al, Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity, Astronomy and Astrophysics, 2015, 574A (2): 116–129, Bibcode:2015A&A...574A.116R, S2CID 59334290, arXiv:1412.4634 , doi:10.1051/0004-6361/201322360.

[sb0-9] * gam Com -- Star in Cluster, database entry, SIMBAD. Accessed on line October 12, 2010.

[Eggleton2008-10] Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.

[11] Tonkin, Stephen F., Binocular astronomy, Springer: 124, 2007, ISBN 978-1-84628-308-6.

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觀測資料曆元 J2000.0
星座	后髮座
星官	郎位（太微垣）
赤經	12^h 26^m 56.27207^s^[1]
赤緯	+28° 16′ 06.3211″^[1]
視星等（V）	4.36^[2]
特性
光譜分類	K1 III Fe0.5^[3]
U−B 色指數	+1.16^[2]
B−V 色指數	+1.13^[2]
R−I 色指數	+0.51^[4]
天體測定

徑向速度 (R_v)	7000338000000000000♠+3.38±0.11^[5] km/s
自行 (μ)	赤經：−83.990 ± 0.418^[6] mas/yr 赤緯：−82.216 ± 0.345^[6] mas/yr
視差 (π)	19.2552 ± 0.2371^[6] mas
距離	169 ± 2 ly (51.9 ± 0.6 pc)
絕對星等 (M_V)	0.76^[7]

詳細資料 ^{^[8]}

質量	7000165000000000000♠1.65±0.18 M_☉
半徑	7001117600000000000♠11.76±0.14 R_☉
表面重力 (log g)	7000252999999999999♠2.53±0.05
亮度	7001582000000000000♠58.2±1.1 L_☉
溫度	7003465200000000000♠4,652±18 K
金屬量 [Fe/H]	6999160000000000000♠0.16±0.10 dex
自轉速度 (v sin i)	≤ 17^[4] km/s
年齡	7000272000000000000♠2.72±0.78 Gyr

其他命名
γ Com、15 Comae Berenices、BD+29° 2288、FK5 2999、GC 16964、HD 108381、HIP 60742、HR 4737、SAO 82313、PPM 101903^[9]
參考資料庫
SIMBAD	資料