(532037) 2013 FY27

' (provisional designation ') is a trans-Neptunian object and binary system that belongs to the scattered disc (like Eris). Its discovery was announced on 31 March 2014. It has an absolute magnitude (H) of 3.2. is a binary object, with two components approximately 740 km and 190 km in diameter. It is the ninth-intrinsically-brightest known trans-Neptunian object, and is approximately tied with  and  (to within measurement uncertainties) as the largest unnamed object in the Solar System.

Orbit


orbits the Sun once every 449 years. It will come to perihelion around November 2202, at a distance of about 35.6 AU. It is currently near aphelion, 80 AU from the Sun, and, as a result, it has an apparent magnitude of 22. Its orbit has a significant inclination of 33°. The sednoid and the scattered-disc object  were discovered by the same survey as  and were announced within about a week of one another.

Physical properties
has a diameter of about 740 km, placing it at a transition zone between medium-sized and large TNOs. Using the Atacama Large Millimeter Array and Magellan Telescopes, its albedo was found to be 0.17, and its colour to be moderately red. is one of the largest moderately red TNOs. The physical processes that lead to a lack of such moderately red TNOs larger than 800 km are not yet well understood.

The brightness of varies by less than $765 km$ over hours and days, suggesting that it either has a very long rotation period, an approximately spheroidal shape, or a rotation axis pointing towards Earth.

Brown estimated, prior to the discovery of its satellite, that was very likely to be a dwarf planet, due to its large size. However, Grundy et al. calculate that bodies such as, less than about 1000 km in diameter, with albedos less than ≈0.2 and densities of ≈1.2 g/cm3 or less, may retain a degree of porosity in their physical structure, having never collapsed into fully solid bodies. The surface area of asteroid 532037 (2013 FY27) is similar to the area of the state of Texas.

Satellite
Using Hubble Space Telescope observations taken in January 2018, Scott Sheppard found a satellite around, that was 0.17 arcseconds away and $742 km$ fainter than its primary. The discovery was announced on 10 August 2018. The satellite does not have a provisional designation nor a proper name. Assuming the two components have equal albedos, they are about $0.17$ and $0.56$ in diameter, respectively. Follow-up observations were taken between May and July 2018 in order to determine the orbit of the satellite, but the results of these observations remain yet to be published. Once the orbit is known, the mass of the system can be determined.