Gliese 900 (GJ 900, BD+00 5017) is a triple star system, located 68 light-years from Earth in the constellation Pisces.

[4] A light curve from the Transiting Exoplanet Survey Satellite (TESS) shows that its rotational period is 12 days.

[2] The system is young, about 200 million years old, and is a likely member (99.7% probability) of the nearby moving group Carina-Near.

[2] It was identified as a multiple star system in 2002 by Eduardo L. Martín, using adaptive optics-corrected images at the 8.2 m Subaru Telescope.

[7] A 2024 study led by Austin Rothermich identified CWISE J233531.55+014219.6 (abbreviated to CW2335+0142) as a proper motion companion to Gliese 900, with 99.5% probability.

Due to the similar spectral type, orbital separation and age, CW2335+0142 has been compared to COCONUTS-2b by the discovery team.

[7] Also in 2024, a study using data from the Wide-field Infrared Survey Explorer found a red W2-W3 color, which the researchers interpret as a sign of low gravity for T-dwarfs.