description Gliese 876 e Overview
Gliese 876 e is an exoplanet orbiting Gliese 876, a nearby red dwarf in the constellation Aquarius. It was reported in 2010 from radial-velocity observations and is the outermost member of the system's four-planet configuration. The planet has a mass comparable to Jupiter and an orbital period of about 124 days. Gliese 876 is notable for hosting several planets in compact or dynamically linked orbits around a low-mass star.
help Gliese 876 e FAQ
How was Gliese 876 e discovered?
Gliese 876 e was detected by the radial-velocity method, which measures the star's back-and-forth motion rather than a transit dip. The discovery was reported in 2010 by Rivera and collaborators.
How long is a year on Gliese 876 e, and what is its mass?
It takes about 124.3 days to orbit Gliese 876. Its measured minimum mass is about 15 Earth masses, or roughly 0.05 Jupiter masses, so it is closer to a Neptune-mass planet than a Jupiter-mass one.
Is Gliese 876 e the outermost planet in its system?
Yes, it is the outermost member of the known four-planet Gliese 876 system. Its orbit is about 0.34 AU from the red dwarf in Aquarius, beyond planets b, c, and d.
Does Gliese 876 e transit its star?
It is cataloged as a radial-velocity planet, not a transit discovery, and no regular transit observation is central to its detection. That is why the reported mass is normally expressed as a minimum mass, about 15 Earth masses.
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