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**HD 115404**
观测数据; 曆元 J2000 分點 J2000
星座	后髮座
	HD 115404 A
赤經	13h 16m 51.051430s
赤緯	+17° 01′ 01.840901″
視星等 (V)	6.66
	HD 115404 B
赤經	13h 16m 51.554014s
赤緯	+17° 00′ 59.892133″
視星等 (V)	9.50
特性
U−B 色指数	+0.64
B−V 色指数	+0.92
特性
光谱分类	K2 V
天体测定
HD 115404 A
徑向速度 (Rv)	7.62 ± 0.09 km/s
自行 (μ)	赤经：636.285±0.028 mas/yr ; 赤纬：−264.678±0.031 mas/yr
视差 (π)	91.0176 ± 0.0236 mas
距离	35.834 ± 0.009 ly ; (10.987 ± 0.003 pc)
HD 115404 B
徑向速度 (Rv)	5.95±0.13 km/s
自行 (μ)	赤经：649.666±0.031 mas/yr ; 赤纬：−263.937±0.026 mas/yr
视差 (π)	90.9475 ± 0.0232 mas
距离	35.862 ± 0.009 ly ; (10.995 ± 0.003 pc)
	軌道
繞行週期 (P)	770.0 yr
半長軸 (a)	8.06"
偏心率 (e)	0.12
倾斜角 (i)	93.41°
升交点黃經 (Ω)	104.66°
近心点曆元 (T)	B 1875.0
近心點幅角 (ω); (secondary)	276.99°
詳細資料
HD 115404 A
質量	0.70 ± 0.09 M☉
半徑	0.76 ± 0.02 R☉
表面重力 (log g)	4.58 ± 0.03
亮度	3.1 L☉
溫度	4976 K
金属量 [Fe/H]	−0.08 dex
自轉速度 (v sin i)	2.8 km/s
年齡	10.2 (5.4–13.5) Gyr
HD 115404 B
質量	0.542 M☉
半徑	0.550 R☉
其他命名
	BD+17° 2611、GJ 505、HD 115404、HIP 64797、SAO 100491、LHS 2713
參考資料庫
SIMBAD	A
	B
ARICNS	A
	B

HD 115404 是一個位於后髮座附近的雙星系統。依巴谷卫星進行的視差測量將系統置於 36 光年或 11 秒差距之外^[11]。視星等分別為 6.66 和 9.50^[2]。

主星A是一顆K型主序星^[5]。它的質量大約是太陽的70%，半徑是太陽的0.76倍^[8]。它的伴星是一顆紅矮星(M0.5 V)^[12]。它的質量是太陽的54.2%，半徑是太陽的0.55 倍^[9]。這兩顆恆星每770年繞軌道運行一次^[7]。該系統被認為相當古老，有5.4到135億年的歷史^[8]。

參考資料

^ ^1.0 ^1.1 ^1.2 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ ^2.0 ^2.1 ^2.2 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. The Tycho double star catalogue. Astronomy and Astrophysics. 2002, 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822 .
^ ^3.0 ^3.1 ^3.2 ^3.3 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ ^4.0 ^4.1 Cowley, A. P.; Hiltner, W. A.; Witt, A. N. Spectral classification and photometry of high proper motion stars. The Astronomical Journal. 1967, 72: 1334. Bibcode:1967AJ.....72.1334C. doi:10.1086/110413.
^ ^5.0 ^5.1 White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun. The Astronomical Journal. 2007, 133 (6): 2524. Bibcode:2007AJ....133.2524W. S2CID 122854. arXiv:0706.0542 . doi:10.1086/514336.
^ Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups. Astronomy and Astrophysics. 2010, 521: A12. Bibcode:2010A&A...521A..12M. S2CID 119209183. arXiv:1007.1132 . doi:10.1051/0004-6361/201014948.
^ ^7.0 ^7.1 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [11 August 2017]. （原始内容存档于2017-08-01）.
^ ^8.00 ^8.01 ^8.02 ^8.03 ^8.04 ^8.05 ^8.06 ^8.07 ^8.08 ^8.09 Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai. Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars. The Astrophysical Journal Supplement Series. 2016, 225 (2): 32. Bibcode:2016ApJS..225...32B. S2CID 118507965. arXiv:1606.07929 . doi:10.3847/0067-0049/225/2/32.
^ ^9.0 ^9.1 ^9.2 Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berlind, Perry; Calkins, Michael L.; Mink, Jessica. The Hα emission of nearby M dwarfs and its relation to stellar rotation. The Astrophysical Journal. 2017, 834 (1): 85. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509 . doi:10.3847/1538-4357/834/1/85.
^ HD 115404. SIMBAD. 斯特拉斯堡天文資料中心.
^ van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2023-04-19]. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2016-04-02）. Vizier catalog entry （页面存档备份，存于互联网档案馆）
^ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. CARMENES input catalogue of M dwarfs (PDF). Astronomy & Astrophysics. 2015, 577: A128. S2CID 53135130. arXiv:1502.07580 . doi:10.1051/0004-6361/201525803. ^{[失效連結]}

[GaiaDR3A-1] 1.0 ^1.1 ^1.2 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[Fabricius-2] 2.0 ^2.1 ^2.2 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. The Tycho double star catalogue. Astronomy and Astrophysics. 2002, 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822 .

[GaiaDR3B-3] 3.0 ^3.1 ^3.2 ^3.3 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[Cowley-4] 4.0 ^4.1 Cowley, A. P.; Hiltner, W. A.; Witt, A. N. Spectral classification and photometry of high proper motion stars. The Astronomical Journal. 1967, 72: 1334. Bibcode:1967AJ.....72.1334C. doi:10.1086/110413.

[White-5] 5.0 ^5.1 White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun. The Astronomical Journal. 2007, 133 (6): 2524. Bibcode:2007AJ....133.2524W. S2CID 122854. arXiv:0706.0542 . doi:10.1086/514336.

[Maldonaldo-6] Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups. Astronomy and Astrophysics. 2010, 521: A12. Bibcode:2010A&A...521A..12M. S2CID 119209183. arXiv:1007.1132 . doi:10.1051/0004-6361/201014948.

[ORB6-7] 7.0 ^7.1 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [11 August 2017]. （原始内容存档于2017-08-01）.

[Brewer-8] 8.00 ^8.01 ^8.02 ^8.03 ^8.04 ^8.05 ^8.06 ^8.07 ^8.08 ^8.09 Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai. Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars. The Astrophysical Journal Supplement Series. 2016, 225 (2): 32. Bibcode:2016ApJS..225...32B. S2CID 118507965. arXiv:1606.07929 . doi:10.3847/0067-0049/225/2/32.

[Newton-9] 9.0 ^9.1 ^9.2 Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berlind, Perry; Calkins, Michael L.; Mink, Jessica. The Hα emission of nearby M dwarfs and its relation to stellar rotation. The Astrophysical Journal. 2017, 834 (1): 85. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509 . doi:10.3847/1538-4357/834/1/85.

[SIMBAD-10] HD 115404. SIMBAD. 斯特拉斯堡天文資料中心.

[van_Leeuwen2007-11] van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2023-04-19]. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2016-04-02）. Vizier catalog entry （页面存档备份，存于互联网档案馆）

[AlonsoFloriano-12] Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. CARMENES input catalogue of M dwarfs (PDF). Astronomy & Astrophysics. 2015, 577: A128. S2CID 53135130. arXiv:1502.07580 . doi:10.1051/0004-6361/201525803. ^{[失效連結]}

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