81 Ceti

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
Distance300 ± 10 ly
(93 ± 4 pc)
Absolute magnitude (MV)0.718
Details
Mass2.4+0.1
0.4
 M
Radius11+0.2
0.1
 R
Surface gravity (log g)3.2 cgs
Metallicity–0.06 ± 0.03
Other designations
Database references
SIMBADdata
Exoplanet Archivedata
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]

The 81 Ceti planetary system[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

External links

Coordinates: 02h 37m 41.8003s, −03° 23′ 46.229″

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