81 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 37m 41.80s[1] |
| Declination | –03° 23′ 46.2″[1] |
| Apparent magnitude (V) | 5.656 |
| Characteristics | |
| Spectral type | G5III |
| B−V color index | 1.011 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +7.7 km/s |
| Proper motion (μ) | RA: 40.18 ± 0.52[1] mas/yr Dec.: -42.91 ± 0.55[1] mas/yr |
| Parallax (π) | 10.81 ± 0.45[1] mas |
| Distance | 300 ± 10 ly (93 ± 4 pc) |
| Absolute magnitude (MV) | 0.718 |
| Details | |
| Mass | 2.4+0.1 −0.4 M☉ |
| Radius | 11+0.2 −0.1 R☉ |
| Surface gravity (log g) | 3.2 cgs |
| Metallicity | –0.06 ± 0.03 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
81 Ceti (abbreviated 81 Cet) is the Flamsteed designation of a G-type giant star approximately 300 light years away[1] in the constellation of Cetus. Based on its mass of 2.4 solar masses, it was an A-type star when it was a main-sequence star.
Planetary system
In July 2008, the planet 81 Ceti b was announced by Sato, along with 14 Andromedae b and 6 Lyncis b. The planet was found to be a super-Jupiter, with 5.3 times the mass of Jupiter. It takes 953 days for it to complete its orbit around the star.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥5.3 MJ | 2.5 | 952.7 ± 8.8 | 0.206 ± 0.029 | — | — |
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
- 1 2 Sato, Bun'ei; et al. (2008). "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042". Publications of the Astronomical Society of Japan 60 (6): 1317–1326. arXiv:0807.0268. Bibcode:2008PASJ...60.1317S. doi:10.1093/pasj/60.6.1317.
External links
- Jean Schneider (2011). "Notes for star 81 Cet". Extrasolar Planets Encyclopaedia. Retrieved 12 October 2011.
Coordinates: 
02h 37m 41.8003s, −03° 23′ 46.229″
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