Gliese 317
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Gliese 317 is a small red dwarf star in the southern constellation Pyxis, located 49.6 light-years from the Sun. It is an M-type main-sequence star with a stellar classification of M2.5V, too faint to be seen with the naked eye at an apparent visual magnitude of 11.98. The star is notable for hosting two confirmed exoplanets, including a Jupiter analog.
Quick Facts
- Constellation
- Pyxis
- Distance
- 49.6 light-years
- Radial velocity
- +87.8 km/s
- Apparent visual magnitude
- 11.98
- Absolute magnitude
- 11.06
- Stellar classification
- M2.5V
- Mass
- 42% of the Sun
- Rotation period
- 69 days
Facts from the source article.
Planetary system
A jovian planet, Gliese 317 b, was announced in 2007, orbiting at about 95% of the Earth–Sun distance. Despite this proximity, its orbital period is about 1.9 years due to the star's lower mass. Astrometric measurements revised the star's distance to 15.3 pc, implying greater stellar and planetary masses, and constrained the orbital inclination, placing an upper mass limit of 2.5 Jupiter masses for Gliese 317 b at a 98% confidence level.
A second planet, Gliese 317 c, was confirmed with additional radial velocity data, though its period and orbital parameters remained very uncertain, with a period greater than 2000 days. Stability analysis suggests the two gas giants are in a 4:1 mean motion resonance. Revised elements presented in 2020 showed that Gliese 317 c is a Jupiter analog and a good candidate for direct imaging.
More in Planetary Systems with Two Confirmed Planets
Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Gliese 317 (CC BY-SA 4.0).
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