55 Cancri Ad
Radial velocity changes over time of 55 Cancri caused by the orbit of 55 Cancri Ad. | |
| Discovery | |
|---|---|
| Discovered by | Marcy et al. |
| Discovery site | California, USA |
| Discovery date | June 13, 2002 |
| Radial velocity | |
| Orbital characteristics | |
| 5.41 ± 0.20 AU (809,000,000 ± 30,000,000 km) | |
| Eccentricity | 0.025±0.063 |
| 4,600 ± 130 days (12.59 ± 0.36 years) | |
| 2,452,500.6 ± 230 | |
| 7.3°±3.7° | |
| Semi-amplitude | 38.6°±3.5° |
| Star | 55 Cancri A |
| Physical characteristics | |
| Mass | ≥2.95±0.27 MJ |
55 Cancri Ad (abbreviated 55 Cnc Ad), formally named Lipperhey /ˈlɪpərhiː/, is a candidate extrasolar planet thought to be in a long-period orbit around the Sun-like star 55 Cancri A. If confirmed, it would be at a similar distance from its star as Jupiter is from the Sun, and the fifth and outermost known planet in its planetary system. 55 Cancri Ad was discovered on June 13, 2002.