V391 Pegasi b
|Extrasolar planet||List of extrasolar planets|
|Right ascension||(α)||22h 04m 12.2s|
|Declination||(δ)||+26° 25′ 08″|
|Semimajor axis||(a)||1.7±0.1 AU|
|Orbital period||(P)||1170±44 d|
|Time of periastron||(T0)||2,452,418±96 JD|
|Minimum mass||(m sin i)||3.2±0.7 MJ|
|Discovery date||Mar-Sept 2007|
|Discoverer(s)||Silvotti et al.|
|Discovery method||variable star timing|
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).
- 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. arXiv:astro-ph/0703753. Bibcode:2007ASPC..372..369S.
- 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. Bibcode:2007Natur.449..189S. doi:10.1038/nature06143. PMID 17851517. Retrieved 2007-09-15.
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