| HD 154857 b | |
| Discoverer: | McCarthy et al. AAT  Australia |
| Discovery Site: | AAPS |
| Discovered: | 2004 |
| Apsis: | astron |
| Aphelion: | 1.8AU |
| Perihelion: | 0.64AU |
| Semimajor: | 1.2± |
| Eccentricity: | 0.47±0.02 |
| Period: | 409±1 d 1.12 y |
| Time Periastron: | 2450346±5 |
| Arg Peri: | 59±4 |
| Semi-Amplitude: | 50.4±1 |
| Mass: | >1.8±0.4 (>570±100) |
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.