55 Cancri d
55 Cancri d (abbreviated 55 Cnc d), formally named Lipperhey /ˈlɪpərhiː/, is an extrasolar planet in a long-period orbit around the Sun-like star 55 Cancri A. Located at a similar distance from its star as Jupiter is from the Sun, it is the fifth and outermost known planet in its planetary system. 55 Cancri d was discovered on June 13, 2002.
Radial velocity changes over time of 55 Cancri caused by the orbit of 55 Cancri d. | |
| Discovery | |
|---|---|
| Discovered by | Marcy et al. |
| Discovery site | California, USA |
| Discovery date | June 13, 2002 |
Detection method | Radial velocity |
| Orbital characteristics | |
| Apastron | 5.92 AU (886,000,000 km) |
| Periastron | 5.63 AU (842,000,000 km) |
Semi-major axis | 5.77 ± 0.11 AU (863,000,000 ± 16,000,000 km) |
| Eccentricity | 0.025 ± 0.03 |
Orbital period (sidereal) | 5218 ± 230 d 14.29 y |
| 2,452,500.6 ± 230 | |
| 181.3 ± 32 | |
| Semi-amplitude | 46.85 ± 1.8 |
| Star | 55 Cancri A |
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