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Gliese 15 Ab (GJ 15 Ab), also calledGroombridge 34 Ab,^{[note 1]} rarely called GX Andromedae b is anextrasolar planet approximately 11light-years away in theconstellation ofAndromeda. It is found in the night sky orbiting the starGliese 15 A, which is atright ascension 00h 18m 22.89s anddeclination +44° 01′ 22.6″.^[2]

It was discovered in August 2014,^[3] deduced from analysis of theradial velocities of the parent star by the Eta-Earth Survey using HIRES atKeck Observatory. It has around 5.35 ± 0.75Earth masses,^[3] and is thought to be aSuper-Earth with a diameter greater than that of the Earth. However, researches using theCARMENES spectrograph failed to detect the planet in 2017.^[4] The detection of planet was recovered in 2018, with revised minimum mass of 3.03M_🜨.^[1]

Gliese 15 Ab has a close inner orbit around Gliese 15 A with a semi-major axis of only 0.0717 ± 0.0034AU, making anorbital period that is just a little longer than 11.4days, the orbit appears to be relatively circular, with anorbital eccentricity of about 0.12. It orbits too close toGliese 15 A to be located in thehabitable zone and is unlikely to harbour life.

• Open Exoplanet Catalogue entryArchived 2019-04-16 at theWayback Machine

• Andromeda (constellation)
• Exoplanets discovered in 2014
• Terrestrial planets
• Exoplanets detected by radial velocity
• Hot Neptunes
• Exoplanets in the Gliese Catalog

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