55 Cancri f
55 Cancri f (abbreviated 55 Cnc f), also designated Rho1 Cancri f and formally named Harriot /ˈhæriət/, is an exoplanet approximately 41 light-years away from Earth in the constellation of Cancer (the Crab). 55 Cancri f is the fourth known planet (in order of distance) from the star 55 Cancri and the first planet to have been given the designation of "f".
An artist's impression of 55 Cancri f. The three bright dots near its star are the three innermost planets. | |
| Discovery | |
|---|---|
| Discovered by | announced by J. Wisdom published by D. Fischer |
| Discovery site | United States |
| Discovery date | 11 April 2005 (announced) 6 November 2007 (published) |
Detection method | Doppler spectroscopy |
| Orbital characteristics | |
| Apastron | 0.833 AU (124,600,000 km) |
| Periastron | 0.730 AU (109,200,000 km) |
Semi-major axis | 0.781 ± 0.007 AU (116,800,000 ± 1,000,000 km) |
| Eccentricity | 0.2 ± 0.2 |
Orbital period (sidereal) | 260.00 ± 1.1 d 0.7118 y |
| 2,450,080.9108 ± 1.1 | |
| 181.1 ± 60 | |
| Semi-amplitude | 4.879 ± 0.6 |
| Star | 55 Cancri A |
| Physical characteristics | |
| Temperature | 200–300 K (−73–27 °C; −100–80 °F) |
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