| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 231701 | |
| Constellation | Sagitta | |
| Right ascension | (α) | 19h 32m 04.1611s |
| Declination | (δ) | +16° 28′ 27.444″ |
| Distance | 353.6 ly (108.4 pc) |
|
| Spectral type | F8V | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.55 AU |
| Periastron | (q) | 0.45 AU |
| Apastron | (Q) | 0.65 AU |
| Eccentricity | (e) | 0.19±0.05 |
| Orbital period | (P) | 142±2.8 d (0.389 y) |
| Argument of periastron |
(ω) | 117±24° |
| Time of periastron | (T0) | 2,453,203±3.2 JD |
| Semi-amplitude | (K) | 38.3 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 1.08 MJ |
| Discovery information | ||
| Discovery date | April 10, 2007 | |
| Discoverer(s) | Fischer et al. | |
| Detection method | Radial velocity | |
| Discovery site | California, USA | |
| Discovery status | Published | |
HD 231701 b is an extrasolar planet approximately 354 light years away in the constellation of Sagitta. This planet orbits at 0.55 AU from the star HD 231701 with eccentricity 0.19. Based on its high mass of 1.08 MJ, the planet is probably a gas giant, meaning the planet has no solid surface and have composition similar to solar system's outer planets.