GU Piscium b

It is a gas giant[6] located in the constellation of Pisces, 155 light-years from the Solar System, and estimated to have a mass nine to thirteen times that of Jupiter,[7] and a surface temperature of 1000 K.[8] It is a relatively young stellar system, part of the AB Doradus moving group of ca.

[1] A later work found it more similar to known tight binary T-dwarfs and assigned a spectral type of T2+T8.

First a study with the Canada-France-Hawaii Telescope found a rotation period of around 6 hours and an amplitude of 4 ±1% on 2014 October 11.

[12] Its large distance away from its parent star permitted the use of combined infrared and visible light images to detect it, a technique astronomers hope to reproduce to discover much closer planets with the Gemini Planet Imager (GPI) in Chile.

Near-infrared spectroscopy of the companion was obtained with the GNIRS spectrograph on the Gemini North Telescope, which shows evidence of low surface gravity confirming the planet's youth.