2013 FT28

2013 FT₂₈ is a trans-Neptunian object. It was discovered on 16 March 2013 at Cerro Tololo Observatory, La Serena and announced on 30 August 2016.^[2]

2013 FT28

The orbit of 2013 FT28 (right side in light blue, click image to enlarge) and other extreme detached objects, along with the hypothetical Planet Nine's orbit on the right
Discovery
Discovered by	Scott S. Sheppard Chad Trujillo
Discovery date	16 March 2013
Designations
Designation	2013 FT28
Minor planet category	TNO E-SDO (detached object)
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 4
Observation arc	1089 days (2.98 yr)
Aphelion	546 AU (barycentric)[1]
Perihelion	43.6 AU
Semi-major axis	296 AU (barycentric)[1]
Eccentricity	0.86
Orbital period (sidereal)	5051 yr (barycentric)[1]
Mean anomaly	357.15°
Inclination	17.3°
Longitude of ascending node	217.7°
Argument of perihelion	40.2°
Physical characteristics
Dimensions	100–400 km
Apparent magnitude	24.3
Absolute magnitude (H)	6.7

2013 FT₂₈ is the first high semi-major axis, high perihelion extreme trans-Neptunian object that is anti-aligned with the other known extreme trans-Neptunian objects such as Sedna and 2012 VP113, i.e. its longitude of perihelion differs by 180° from other objects. The orbit of 2013 FT₂₈ appears stable though simulations showed that it may have some resonant interaction with the known giant planets.^[3]

Its argument of perihelion is similar to that of another TNO, 2015 KG163.

Closeup of current position near perihelion, passing downward from the upper left of this view