description GJ 849 b Overview
GJ 849 b is a gas-giant exoplanet detected by radial-velocity measurements around the nearby M dwarf GJ 849, about 29 light-years from the Sun. It has a minimum mass close to that of Jupiter, an orbital period of about 1,925 days, and a semimajor axis near 2.3 astronomical units. Its long orbit and host-star type made it an early example of a Jupiter-mass planet around a red dwarf, although it is not a solar-system Jupiter twin.
help GJ 849 b FAQ
Was GJ 849 b found by a transit or by a stellar wobble?
GJ 849 b was detected by the radial-velocity method, which measures the small wobble caused by the planet's gravity. Because it is not a transit discovery, its listed mass is a minimum mass and its radius is estimated rather than directly measured. [NASA Science](https://science.nasa.gov/exoplanet-catalog/gj-849-b/)
How long is a year on GJ 849 b?
GJ 849 b takes about 1,925 days, or roughly 5.3 years, to orbit its star. Its semimajor axis is about 2.32 astronomical units. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/GJ%20849)
How massive is GJ 849 b compared with Jupiter?
Its minimum mass is about 0.89 times Jupiter's mass, so it is a genuine gas giant rather than a super-Earth or Neptune-mass planet. The true mass could be higher because radial velocity measures only the mass component along our line of sight. [NASA Science](https://science.nasa.gov/exoplanet-catalog/gj-849-b/)
What kind of star does GJ 849 b orbit?
It orbits the nearby M dwarf GJ 849, roughly 29 light-years from the Sun. The planet's long orbit around a small red star is one reason GJ 849 b is often discussed as a Jupiter-like planet in an M-dwarf system. [NASA Science](https://science.nasa.gov/exoplanet-catalog/gj-849-b/)
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