81 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 37m 41.80s |
| Declination | –03° 23′ 46.2″ |
| 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 mas/yr Dec.: -42.91 ± 0.55 mas/yr |
| Parallax (π) | 10.81 ± 0.45mas |
| Distance | 300 ± 10 ly (93 ± 4 pc) |
| Absolute magnitude (MV) | 0.718 |
| Details | |
| Mass | 1.6 ± 0.2 M☉ |
| Radius | 11.1 ± 0.3 R☉ |
| Luminosity | 60.0 ± 0.8 L☉ |
| Surface gravity (log g) | 2.5 ± 0.1 cgs |
| Temperature | 4825 ± 41 K |
| Metallicity [Fe/H] | –0.06 ± 0.03 dex |
| Age | 2.5 ± 0.9 Gyr |
| 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 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.
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.
Coordinates: 
02h 37m 41.8003s, −03° 23′ 46.229″
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