| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| File:V391 Pegasi planet.png | ||
| Parent star | ||
| Star | V391 Pegasi | |
| Constellation | Pegasus | |
| Right ascension | (α) | 22h 04m 12.2s |
| Declination | (δ) | +26° 25′ 08″ |
| Distance | 4570 ly (1400 pc) | |
| Spectral type | sdB | |
| Orbital elements | ||
| Semimajor axis | (a) | 1.7±0.1 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 1170±44 d |
| Argument of periastron |
(ω) | 23.5±7.0° |
| Time of periastron | (T0) | 2,452,418±96 JD |
| Semi-amplitude | (K) | 76.7 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 3.2±0.7 MJ |
| Discovery information | ||
| Discovery date | Mar-Sept 2007 | |
| Discoverer(s) | Silvotti et al. | |
| Discovery method | variable star timing | |
| Discovery status | Published | |
| Other designations | ||
HS 2201+2610 b
| ||
V391 Pegasi b, also known as HS 2201+2610 b, is an extrasolar planet orbiting the star V391 Pegasi approximately 4570 light-years away in the constellation of Pegasus. The planet was discovered by means of variable star timing, which measured anomalies in variability of the star caused by a planet. It is the first planet to be detected with this method. It found to have mass of 3.2 times Jupiter, semi-major axis of 1.7 AU, and orbital period of 1170 days. The planet was discovered in March 2007 and published in September 2007. Its survival indicates that planets at Earth-like distances can survive their star's red-giant phase, though this is a much larger planet than Earth (about the same size as Jupiter and Saturn).[1]
References[]
- R. Silvotti, S. Schuh, R. Janulis, S. Bernabei, R. Ostensen, J.-E. Solheim, I. Bruni, R. Gualandi, T. Oswalt, A. Bonanno, B. Mignemi, the Whole Earth Telescope Xcov23 collaboration (2007). The O-C diagram of the subdwarf B pulsating star HS2201+2610: detection of a giant planet?. ASP conf. series.
- R. Silvotti, S. Schuh, R. Janulis, J.-E. Solheim, S. Bernabei, R. Østensen, T. D. Oswalt, I. Bruni, R. Gualandi, A. Bonanno, G. Vauclair, M. Reed, C.-W. Chen, E. Leibowitz, M. Paparo, A. Baran, S. Charpinet, N. Dolez, S. Kawaler, D. Kurtz, P. Moskalik, R. Riddle & S. Zola (2007). A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi. Nature 449 (7159): 189–191.
External links[]
Coordinates: Sky map 22h 04m 12.2s, +26° 25′ 08″
| File:Iota-draconis-b.jpg | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |
