V391 Pegasi b

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V391 Pegasi b
Extrasolar planet List of extrasolar planets
V391 Pegasi planet.png
Artistic rendering of V391 Pegasi b
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]

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