| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 73256 | |
| Constellation | Pyxis | |
| Right ascension | (α) | 08h 36m 23.0155s |
| Declination | (δ) | −30° 02′ 15.456″ |
| Distance | 119 ly (36.5 pc) |
|
| Spectral type | G9V | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.037 AU |
| Periastron | (q) | 0.036 AU |
| Apastron | (Q) | 0.038 AU |
| Eccentricity | (e) | 0.029±0.02 |
| Orbital period | (P) | 2.54858±0.00016 d |
| Orbital speed | (υ) | 160 km/s |
| Argument of periastron |
(ω) | 337±46° |
| Time of periastron | (T0) | 2452500.18±0.28 JD |
| Semi-amplitude | (K) | 269±8 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 1.87 MJ |
| Discovery information | ||
| Discovery date | 2003 | |
| Discoverer(s) | Udry et al. | |
| Detection method | Doppler spectroscopy (CORALIE) |
|
| Discovery site | La Silla Observatory, Chile | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
HD 73256 b is an 1.87 MJ hot Jupiter orbiting at 0.037 AU taking 2.55 days to orbit around HD 73256.
Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be about 1300 K. This is close to 51 Pegasi b; between the predicted temperatures of HD 189733 b and HD 209458 b (1180-1392K), before they were measured. It is a candidate for "near-infrared characterisation with the VLTI Spectro-Imager".[1]