HD 154857 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 154857 | |
| Constellation | Ara | |
| Right ascension | (α) | 17h 11m 15.7219s |
| Declination | (δ) | –56° 40′ 50.865″ |
| Distance | 223.55 ly (68.54 pc) |
|
| Spectral type | G5V | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.2±0.2 AU |
| Periastron | (q) | 0.64 AU |
| Apastron | (Q) | 1.8 AU |
| Eccentricity | (e) | 0.47±0.02 |
| Orbital period | (P) | 409±1 d (1.12 y) |
| Argument of periastron |
(ω) | 59±4° |
| Time of periastron | (T0) | 2450346±5 JD |
| Semi-amplitude | (K) | 50.4±1 m/s |
| Physical characteristics | ||
| Mass | (m) | >1.8±0.4 MJ (>570±100 M⊕) |
| Discovery information | ||
| Discovery date | 2004 | |
| Discoverer(s) | McCarthy et al. AAT  Australia
|
|
| Discovery method | Radial velocity | |
| Discovery site | AAPS | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
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.
Coordinates: 
17h 11m 15.7219s, −56° 40′ 50.865″
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