HD 5608
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 58m 14.219s[1] |
| Declination | +33° 57′ 03.18″[1] |
| Apparent magnitude (V) | +5.99 |
| Characteristics | |
| Spectral type | K0 IV |
| Astrometry | |
| Proper motion (μ) | RA: 34.98 ± 0.40[1] mas/yr Dec.: -71.87 ± 0.20[1] mas/yr |
| Parallax (π) | 17.74 ± 0.40 mas[1] |
| Distance | 184 ± 4 ly (56 ± 1 pc) |
| Details | |
| Mass | 1.55 (1.32–1.74) M☉ |
| Radius | 5.5 (5.1–5.9) R☉ |
| Luminosity | 15.1 L☉ |
| Surface gravity (log g) | 3.03 ± 0.08 cgs |
| Temperature | 4854 ± 25 K |
| Metallicity | +0.06 ± 0.04 |
| Age | ? years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 5608 is a K-type subgiant star with one known planet, HD 5608 b.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.4 MJ | 1.9 | 792.6 ± 7.7 | 0.190 ± 0.061 | — | — |
There is a linear drift in the results. This suggests a larger companion - perhaps a brown dwarf (over 75 MJ) at 50 AU.[2]
References
- ^ a b c d e van Leeuwen, F. (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.Vizier catalog entry
- ^ a b c Sato, Bun'ei; et al. (2012). "Substellar Companions to Seven Evolved Intermediate-Mass Stars". Publications of the Astronomical Society of Japan. 64 (6). 135. arXiv:1207.3141. Bibcode:2012PASJ...64..135S. doi:10.1093/pasj/64.6.135.
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