2013 FT28

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2013 FT28 is a distant object in the outer solar system known as a trans-Neptunian object (TNO). It was discovered on March 16, 2013, at Cerro Tololo Observatory in Chile by Scott S. Sheppard and Chad Trujillo, with the discovery announced in August 2016.

The object has an unusually elongated orbit with a semi-major axis of about 296 astronomical units and an eccentricity around 0.86, which means it travels from about 43.6 AU from the Sun at perihelion to about 546 AU at aphelion. Its orbital period is roughly 5,000 years, and it orbits with an inclination of about 17 degrees. 2013 FT28 is notable for being anti-aligned with other extreme TNOs such as Sedna and 2012 VP113, so its longitude of perihelion is about 180 degrees away from theirs. The orbit appears mostly stable but may have some interaction with the giant planets. The object is estimated to be 100–400 kilometers across and has an apparent magnitude near 24.3 (absolute magnitude around 6.7).