| Discovery | |
|---|---|
| Discovered by | McCarthy et al. AAT  Australia |
| Discovery site | AAPS |
| Discovery date | 2004 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | 1.8 AU (270,000,000 km) |
| Periastron | 0.64 AU (96,000,000 km) |
| 1.2 ± 0.2 AU (180,000,000 ± 30,000,000 km) | |
| Eccentricity | 0.47±0.02 |
| 409±1 d 1.12 y | |
| 2450346±5 | |
| 59±4 | |
| Semi-amplitude | 50.4±1 |
| Star | HD 154857 |
| Physical characteristics | |
| Mass | >1.8±0.4 MJ (>570±100 ME) |
HD 154857 b is an extrasolar planet approximately 224 light years away in the constellation of Ara. This is a gas giant mass that orbits the star in an eccentric orbit. This planet was detected by using Anglo-Australian Telescope (AAT) UCLE spectrometer.[1][2]