81 Ceti

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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 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[edit]

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[edit]

References[edit]

  1. ^ a b c d e f 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
  2. ^ a b 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[edit]

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