Gliese 317 b

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Gliese 317 b
Extrasolar planet List of extrasolar planets
Parent star
Star Gliese 317
Constellation Pyxis
Right ascension (α) 08h 40m 59.21s
Declination (δ) –23° 27′ 22.6″
Apparent magnitude (mV) 12
Distance 49.9 ly
(15.3 pc)
Spectral type M3.5V
Orbital elements
Semimajor axis (a) 0.95 AU
Eccentricity (e) 0.193 ± 0.06
Orbital period (P) 692.9 ± 4 d
(1.9 ± 1.1 y)
Argument of
(ω) 344 ± 10°
Time of periastron (T0) 2451639 ± 30 JD
Semi-amplitude (K) 57.3 m/s
Physical characteristics
Minimum mass (m sin i) 1.2 MJ
Discovery information
Discovery date 6 July 2007
Discoverer(s) Johnson et al.
Discovery method Doppler spectroscopy
Discovery site United States W. M. Keck
Discovery status Confirmed
Database references
Extrasolar Planets

Gliese 317 b is an extrasolar planet[1] approximately 50 light-years away in the constellation of Pyxis. The planet was announced in July 2007 to be orbiting the red dwarf star Gliese 317. The planet is a jovian planet that orbits about 95% the distance between Earth to the Sun. Despite of this, it takes about 1.9 years, corresponding to slow orbital velocity of 14.82 km/s.

See also[edit]


  1. ^ Johnson et al.; Butler, R. Paul; Marcy, Geoffrey W.; Fischer, Debra A.; Vogt, Steven S.; Wright, Jason T.; Peek, Kathryn M. G. (2007). "A New Planet Around an M Dwarf: Revealing a Correlation Between Exoplanets and Stellar Mass". The Astrophysical Journal 670 (1): 833–840. arXiv:0707.2409. Bibcode:2007ApJ...670..833J. doi:10.1086/521720. 

Coordinates: Sky map 08h 40m 59.21s, −23° 27′ 22.6″