81 Ceti b

81 Ceti b

Discovery
Discovered by	Sato et al.
Discovery date	July 2, 2008
Detection method	Doppler Spectroscopy
Orbital characteristics
Semi-major axis	2.5 AU (370,000,000 km)
Eccentricity	0.206 ± 0.029
Orbital period (sidereal)	952.7 ± 8.8 d
Time of periastron	2486 ± 26
Argument of periastron	175 ± 69
Star	81 Ceti
Physical characteristics
Mean radius	1.14 RJ Estimate
Mass	5.30 MJ[1][2]

81 Ceti b (abbreviated 81 Cet b) is an extrasolar planet approximately 331 light years away in the constellation of Cetus. It is estimated to be 5.3 times the mass of Jupiter which also makes it a gas giant.^[1][2] It orbits the K-type giant star 81 Ceti at an average distance of 2.5 AU, taking about 2.6 years to revolve with an eccentricity of 0.206.^[3]

Discovery

The preprint announcing this planet was submitted to the arXiv electronic repository on July 2, 2008, by Bun'ei Sato and collaborators, who discovered it using the Doppler Spectroscopy method, during the Okayama Planet Search radial velocity survey of G and K giants at Okayama Astrophysical Observatory.^[3]

See also

• 14 Andromedae b
• 6 Lyncis b
• 79 Ceti b
• 94 Ceti b

References

1. NASA 7012
2. 81 Ceti b
3. 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

• Jean Schneider (2011). "Notes for Planet 81 Cet b". Extrasolar Planets Encyclopaedia. Retrieved 12 October 2011.
• "81 Ceti". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-08-06.