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
Mass1.6 ± 0.2[2] M☉
Radius11.1 ± 0.3[2] R☉
Luminosity60.0 ± 0.8[2] L☉
Surface gravity (log g)2.5 ± 0.1[2] cgs
Temperature4825 ± 41[2] K
Metallicity [Fe/H]–0.06 ± 0.03 dex
Age2.5 ± 0.9[2] Gyr
Other designations
BD−04° 436, GC 3158, HD 16400, HIP 12247, HR 771, SAO 130026
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 and collaborators, 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.[3]

The 81 Ceti planetary system[3]
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. 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
  2. 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  3. 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.
  • 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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