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2013 FT28

2013 FT28
Planet nine-etnos now-new2.png
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
Discovered by
Discovery date16 March 2013
2013 FT28
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 4
Observation arc1089 days (2.98 yr)
Aphelion546 AU (barycentric)[1]
Perihelion43.6 AU
296 AU (barycentric)[1]
5051 yr (barycentric)[1]
Physical characteristics
Dimensions100–400 km

2013 FT28 is a trans-Neptunian object. The existence of the TNO was discovered on 16 March 2013 at Cerro Tololo Observatory, La Serena and revealed on 30 August 2016.[2]

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


  1. ^ a b c Horizons output. "Barycentric Osculating Orbital Elements for 2013 FT28". Retrieved 8 February 2017. (Ephemeris Type:Elements and Center:@0)
  2. ^ "New Solar System objects revealed". bbcnews. 30 August 2016. Retrieved 19 February 2017.
  3. ^ Sheppard, Scott S.; Trujillo, Chadwick (2016). "New Extreme Trans-Neptunian Objects: Towards a Super-Earth in the Outer Solar System". The Astronomical Journal. 155: 221. arXiv:1608.08772. Bibcode:2016AJ....152..221S. doi:10.3847/1538-3881/152/6/221.

External links