HD 180314
HD 180314 is a star in the constellation Lyra. Its apparent magnitude is 6.61[2] and it is about 400 light years from the Sun. This is a K-type star[2] with 2.48 times the mass of the Sun, 8.10 times the Sun's radius, and an effective temperature of about 5,000 K.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 14m 50.2087s[1] |
| Declination | +31° 51′ 37.263″[1] |
| Apparent magnitude (V) | 6.61[2] |
| Characteristics | |
| Spectral type | K0[2] |
| B−V color index | +1.000[2] |
| Astrometry | |
| Radial velocity (Rv) | −73.87 ± 0.20[3] km/s |
| Proper motion (μ) | RA: 47.19[4] mas/yr Dec.: 19.71[4] mas/yr |
| Parallax (π) | 8.24 ± 0.28 mas[4] |
| Distance | 400 ± 10 ly (121 ± 4 pc) |
| Absolute magnitude (MV) | 0.931[2] |
| Details[3] | |
| Mass | 2.48 ± 0.08 M☉ |
| Radius | 8.10 ± 0.45 R☉ |
| Luminosity | 43.7 L☉ |
| Surface gravity (log g) | 3.06 ± 0.10 cgs |
| Temperature | 4997 ± 30 K |
| Metallicity [Fe/H] | 0.22 ± 0.04 dex |
| Age | 0.60 ± 0.05 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star is orbited by one substellar companion, HD 180314 b,[5] an object with a minimum mass 22 times that of Jupiter and hence likely to be a brown dwarf.[2] It orbits HD 180314 every 396 days with a semi-major axis of 1.4 AU. HD 180314 b's orbit is moderately eccentric, with an orbital eccentricity of 0.257.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >22 MJ | 1.4 | 396.03 ± 0.62 | 0.257 ± 0.010 | — | — |
References
- Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.
- Sato, Bun'ei; Omiya, Masashi; Liu, Yujuan; Harakawa, Hiroki; Izumiura, Hideyuki; Kambe, Eiji; Toyota, Eri; Murata, Daisuke; Lee, Byeong-Cheol; Masuda, Seiji; Takeda, Yoichi; Yoshida, Michitoshi; Itoh, Yoichi; Ando, Hiroyasu; Kokubo, Eiichiro; Ida, Shigeru; Zhao, Gang; Han, Inwoo (2010). "Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314". Publications of the Astronomical Society of Japan. 62 (4): 1063–69. arXiv:1005.2860. Bibcode:2010PASJ...62.1063S. doi:10.1093/pasj/62.4.1063. S2CID 119113950.
- Maldonado, J.; Villaver, E.; Eiroa, C. (2013). "The metallicity signature of evolved stars with planets". Astronomy & Astrophysics. 554: 2013. arXiv:1303.3418. Bibcode:2013A&A...554A..84M. doi:10.1051/0004-6361/201321082. S2CID 119289111.
- van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- "HD 180314". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 February 2014.
- "Planet HD 180314 b". The Extrasolar Planets Encyclopaedia. Retrieved 1 January 2016.
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