HD 13931
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 02h 16m 47.38s[1] |
| Declination | +43° 46′ 22.8″[1] |
| Apparent magnitude (V) | 7.597 |
| Characteristics | |
| Spectral type | G0 |
| Apparent magnitude (B) | 8.237 |
| Apparent magnitude (R) | 7.2 |
| Apparent magnitude (I) | 6.9 |
| Apparent magnitude (J) | 6.452 |
| Apparent magnitude (H) | 6.234 |
| Apparent magnitude (K) | 6.139 |
| B−V color index | 0.640 |
| V−R color index | 0.4 |
| R−I color index | 0.3 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +33.7 km/s |
| Proper motion (μ) | RA: 99.03 ± 0.66[1] mas/yr Dec.: –183.19 ± 0.49[1] mas/yr |
| Parallax (π) | 22.61 ± 0.66[1] mas |
| Distance | 144 ± 4 ly (44 ± 1 pc) |
| Absolute magnitude (MV) | 4.306 |
| Details | |
| Mass | 1.022 M☉ |
| Radius | 1.23 R☉ |
| Luminosity | 1.57 L☉ |
| Surface gravity (log g) | 4.30 cgs |
| Temperature | 5829 K |
| Metallicity | +0.03 |
| Rotation | ~26 days |
| Age | 8.4 ± 2.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 13931 is an 8th magnitude G-type star located approximately 144 light years away[1] in the constellation Andromeda. This star is larger, hotter, brighter, and more massive than our Sun. Also its metal content is about 8% greater than the Sun. In 2009, a very long-period gas giant planet was found in orbit around the star.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.88 ± 0.15 MJ | 5.15 ± 0.29 | 4218 ± 388 | 0.02 ± 0.05 | — | — |
See also
References
- 1 2 3 4 5 6 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
- ↑ Howard, Andrew W.; et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal 721 (2): 1467–1481. arXiv:1003.3488. Bibcode:2010ApJ...721.1467H. doi:10.1088/0004-637X/721/2/1467.
Coordinates: 
02h 16m 47.3791s, +43° 46′ 22.784″
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