(532037) 2013 FY₂₇ (provisional designation 2013 FY₂₇) is a trans-Neptunian object and binary system that belongs to the scattered disc (like Eris).^[8] Its discovery was announced on 31 March 2014.^[1] It has an absolute magnitude (H) of 3.2.^[3] 2013 FY₂₇ is a binary object, with two components approximately 740 kilometres (460 mi) and 190 kilometres (120 mi) in diameter. It is the ninth-intrinsically-brightest known trans-Neptunian object,^{[9][failed verification]} and is approximately tied with 2002 AW197 and 2002 MS4 (to within measurement uncertainties) as the largest unnamed object in the Solar System.

2013 FY₂₇ orbits the Sun once every 449 years. It will come to perihelion around November 2202,^{[3][lower-alpha 2]} 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.^[1] Its orbit has a significant inclination of 33°.^[3] The sednoid 2012 VP113 and the scattered-disc object 2013 FZ27 were discovered by the same survey as 2013 FY₂₇ and were announced within about a week of one another.

2013 FY₂₇ has a diameter of about 740 kilometres (460 mi), 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. 2013 FY₂₇ is one of the largest moderately red TNOs. The physical processes that lead to a lack of such moderately red TNOs larger than 800 kilometres (500 mi) are not yet well understood.

The brightness of 2013 FY₂₇ varies by less than 0.06 mag 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.^[4]

Brown estimated, prior to the discovery of its satellite, that 2013 FY₂₇ was very likely to be a dwarf planet, due to its large size.^[10] However, Grundy et al. calculate that bodies such as 2013 FY₂₇, 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.^[11]

The surface area of asteroid 532037 (2013 FY27) is similar to the area of the state of Texas. ^[12]

Using Hubble Space Telescope observations taken in January 2018, Scott Sheppard found a satellite around 2013 FY₂₇, that was 0.17 arcseconds away and 3.0±0.2 mag fainter than its primary. The discovery was announced on 10 August 2018.^[14] The satellite does not have a provisional designation nor a proper name.^[3] Assuming the two components have equal albedos, they are about 740 kilometres (460 mi) and 190 kilometres (120 mi) in diameter, respectively.^[4] Follow-up observations were taken between May and July 2018 in order to determine the orbit of the satellite,^[5] but the results of these observations remain yet to be published as of 2022^[update].^[7] Once the orbit is known, the mass of the system can be determined.

• List of Solar System objects most distant from the Sun
• List of Solar System objects by size