81 Ceti b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | 81 Ceti | |
| Constellation | Cetus | |
| Right ascension | (α) | 02h 37m 41.80s |
| Declination | (δ) | –03° 23′ 46.2″ |
| Apparent magnitude | (mV) | 5.65 |
| Distance | 300 ± 10 ly (93 ± 4 pc) |
|
| Spectral type | G5III | |
| Orbital elements | ||
| Semi-major axis | (a) | 2.5 AU (370 Gm) |
| Periastron | (q) | 2.0 AU (300 Gm) |
| Apastron | (Q) | 3.0 AU (440 Gm) |
| Eccentricity | (e) | 0.206 ± 0.029 |
| Orbital period | (P) | 952.7 ± 8.8 d (2.608 y) |
| Argument of periastron |
(ω) | 175 ± 69° |
| Time of periastron | (T0) | 2486 ± 26 JD |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 5.3 MJ |
| Discovery information | ||
| Discovery date | July 3, 2008 | |
| Discoverer(s) | Sato et al. | |
| Discovery method | Doppler Spectroscopy | |
| Discovery status | Published | |
| Other designations | ||
|
HD 16400 b
|
||
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
81 Ceti b (abbreviated 81 Cet b) is an extrasolar planet approximately 300 light years away in the constellation of Cetus. It orbits the G-type giant star 81 Ceti at an average distance of 2.5 AU, taking about 2.6 years to revolve with 20.6% eccentricity. This planet was discovered on July 3, 2008 by Sato et al., who used Doppler Spectroscopy and found the wobbling of the star caused by the planet’s gravity during its revolution.
Coordinates: 
02h 37m 41.8003s, −03° 23′ 46.229″
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