V391 Pegasi b

V391 Pegasi b
Exoplanet List of exoplanets
Parent star
Star V391 Pegasi
Constellation Pegasus
Right ascension (α) 22h 04m 12.2s
Declination (δ) +26° 25′ 08″
Distance4570 ly
(1400 pc)
Spectral type sdB
Orbital elements
Semi-major 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 site Naples, Italy
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. 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.
  1. ↑ Planet discovered that offers clues to Earth's future

Coordinates: 22h 04m 12.2s, +26° 25′ 08″


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