2MASS J15104761–2818234, sometimes shortened to 2M1510, is a triple or possibly quadruple brown dwarf system, consisting of the eclipsing binary 2M1510A and the wide companion 2M1510B.

[6] The system also belongs to the 45±5 million-year-old Argus moving group[7] and the brown dwarfs have a low surface gravity, which is an additional indicator for youth.

Despite the small letter used in this configuration these objects are not planets, but brown dwarfs that burn deuterium.

Follow-up observations with Keck II and the VLT UT2 showed that 2M1510Aa and 2M1510Ab have very similar masses, something that is called a near equal-mass binary.

[4] This result was not considered by Triaud et al. 2020 and it could represent a contamination of the eclipsing binary, making a test of the cooling models more challenging.