2M1510

2M1510 (full designation: 2MASS J15104761–2818234) is a triple or possibly quadruple system of gravitationally bound brown dwarfs, consisting of the eclipsing binary 2M1510AB and the wide companion 2M1510C. 2M1510AB was found to be an eclipsing binary in the first light data of the SPECULOOS telescopes. It is only the second eclipsing binary brown dwarf found so far (as of March 2020), the other is 2M0535-05. The system verified theoretical models for how brown dwarfs cool. The system is located 120 light-years away from Earth in the constellation Libra.

== Nomenclature == Different works by different teams did give the individual brown dwarfs different names. Triaud et al. used lower cases to describe the inner eclipsing binary, which is common practice. Planets do however also use lower cases. To avoid confusion this article will use the naming used by Baycroft et al. and will call the direct imaging candidate by Calissendorff et al. with a D. {| class="wikitable" |+ !Gizis 2002 ! colspan="3" |2MASSW J1510478-281817 !2MASSW J1510476-281823 |- !publication !direct imaging companion !eclipsing binary pair !exoplanet !wide companion |- |Calissendorff et al. 2019 |2M1510B |– |– |– |- |Triaud et al. 2020 |– |2M1510Aab |– |2M1510B |- |Baycroft et al. 2025 |– |2M1510AB |2M1510(AB)b |2M1510C |- |2M1510 article |2M1510D |2M1510AB |2M1510(AB)b |2M1510C |}