 Artist's impression of 55 Cancri b. | |
| Discovery | |
|---|---|
| Discovered by | Butler, Marcy |
| Discovery site | California, USA |
| Discovery date | April 12, 1996 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | 0.116 AU (17,400,000 km) |
| Periastron | 0.113 AU (16,900,000 km) |
| 0.115 ± 0.0000011 AU (17,203,760 ± 160 km)[1] | |
| Eccentricity | 0.014 ± 0.008[1] |
| 14.65162 ± 0.0007[1] d 0.04011325 y | |
| Inclination | ~85[2][3] |
| 2,450,002.94749 ± 1.2[1] | |
| 131.94 ± 30[1] | |
| Semi-amplitude | 71.32 ± 0.41[1] |
| Star | 55 Cancri A |
| Physical characteristics | |
| Mass | 0.824 ± 0.007[1][2] MJ |
55 Cancri b (abbreviated 55 Cnc b), occasionally designated 55 Cancri Ab (to distinguish it from the star 55 Cancri B), also named Galileo, is an exoplanet orbiting the Sun-like star 55 Cancri A every 14.65 days. It is the second planet in order of distance from its star, and is an example of a hot Jupiter, or possibly rather "warm Jupiter".[4]
In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[5] The process involved public nomination and voting for the new names.[6] In December 2015, the IAU announced the winning name was Galileo for this planet.[7] The winning name was submitted by the Royal Netherlands Association for Meteorology and Astronomy of the Netherlands. It honors early-17th century astronomer and physicist Galileo Galilei.[8]
- ^ a b c d e f g DA Fischer; et al. (March 2008). "Five Planets Orbiting 55 Cancri". Astrophysical Journal. 675 (675): 790–801. arXiv:0712.3917. Bibcode:2008ApJ...675..790F. doi:10.1086/525512. S2CID 17083836.
- ^ a b Ehrenreich, David; Bourrier, Vincent; Bonfils, Xavier; Lecavelier des Étangs, Alain; Hébrard, Guillaume; Sing, David K.; Wheatley, Peter J.; Vidal-Madjar, Alfred; Delfosse, Xavier; Udry, Stéphane; Forveille, Thierry (2012-11-01). "Hint of a transiting extended atmosphere on 55 Cancri b". Astronomy & Astrophysics. 547: A18. arXiv:1210.0531. Bibcode:2012A&A...547A..18E. doi:10.1051/0004-6361/201219981. ISSN 0004-6361.
- ^ D. Dragomir, 2012-08-27, referred to in Ehrenreich
- ^ "Astrophile: First puffy, 'warm Jupiter' spotted - space - 12 October 2012". New Scientist. Retrieved 2012-11-09.
- ^ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ^ "NameExoWorlds The Process". Archived from the original on 2015-08-15. Retrieved 2015-09-05.
- ^ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ^ "NameExoWorlds The Approved Names". Archived from the original on 2018-02-01. Retrieved 2015-12-27.