HD 8673
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 26m 08.7858s[1] |
| Declination | +34° 34′ 46.927″[1] |
| Apparent magnitude (V) | 6.31 |
| Characteristics | |
| Spectral type | F7V/M2V[2] |
| U−B color index | 0.01 |
| B−V color index | 0.47 |
| Astrometry | |
| Radial velocity (Rv) | 16.9 ± 2 km/s |
| Proper motion (μ) | RA: 236.734±0.034[1] mas/yr Dec.: −84.290±0.026[1] mas/yr |
| Parallax (π) | 26.38 ± 0.25 mas[1] |
| Distance | 124 ± 1 ly (37.9 ± 0.4 pc) |
| Absolute magnitude (MV) | 6.78 |
| Details | |
| Mass | 1.3 M☉ |
| Radius | 1.07 R☉ |
| Luminosity | 4.588 L☉ |
| Temperature | 6000 – 7500 K |
| Rotation | 0.004641 years |
| Age | 1.95 × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 8673 is a binary star consisting of a F-type main-sequence star and a Red dwarf star[2] approximately 124 light-years away[1] in the constellation of Andromeda. It has an apparent magnitude and absolute magnitude of 6.31 and 3.40 respectively. A sub-stellar companion was detected in 2005, it could either be a exoplanet or a brown dwarf.
Possible planetary system
An orbiting sub-stellar companion with a minimum mass 14 times that of Jupiter in a high-eccentricity orbit was discovered in 2005 and confirmed in 2010. This 1600 day object orbits at 3 AU away from its parent star.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥14.2 ± 1.6 MJ | 3.02 ± 0.15 | 1634 ± 17 | 0.723 ± 0.016 | — | — |
References
- ^ a b c d e f Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
- ^ a b Roberts, Lewis C.; et al. (2015). "Know the Star, Know the Planet. IV. A Stellar Companion to the Host Star of the Eccentric Exoplanet HD 8673b". The Astronomical Journal. 149 (4). 144. arXiv:1502.06630. Bibcode:2015AJ....149..144R. doi:10.1088/0004-6256/149/4/144.
- ^ a b Hartmann, Michael; et al. (2010). "A Sub-stellar Companion around the F7 V Star HD 8673". The Astrophysical Journal. 717 (1): 348–356. Bibcode:2010ApJ...717..348H. doi:10.1088/0004-637X/717/1/348.
- Hatzes; et al. (2005). "The first extrasolar planets from the TOPS program: a superplanet around a massive evolved star and an F7 star" (pdf). Geophysical Resource Abstract. 7. Retrieved December 21, 2007.
External links
- "Notes for star HD 8673". The Extrasolar Planets Encyclopaedia. Retrieved December 21, 2007.
- "Notes for planet HD 8673 b". The Extrasolar Planets Encyclopaedia. Retrieved December 21, 2007.
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