2013 SY₉₉

2013 SY₉₉
	The orbits of 2013 SY99 (left; light blue) and other detached objects, along with the hypothetical Planet Nine's orbit (right; green)
Discovery
Discovered by	OSSOS
Discovery site	CFHT
Discovery date	29 September 2013
Designations
MPC designation	2013 SY99
Alternative designations	uo3L91 (OSSOS survey designation)
Minor planet category	TNO · detached
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 4
Observation arc	4.30 yr
Earliest precovery date	5 September 2013
Aphelion	Barycentric: 1,410 AU; (211 billion km; 131 billion mi); Heliocentric: 1,330.8 ± 43.4 AU; (199.1 ± 6.5 billion km; 123.7 ± 4.0 billion mi);
Perihelion	50.029 ± 0.056 AU; (7.48 ± 0.01 billion km; 4.65 ± 0.01 billion mi)
Semi-major axis	Barycentric: 730 AU; (109 billion km; 68 billion mi); Heliocentric: 690.4 ± 22.5 AU; (103.3 ± 3.4 billion km; 64.2 ± 2.1 billion mi);
Eccentricity	0.9274±0.0024
Orbital period (sidereal)	Barycentric: 19700 yr; Heliocentric: 18142.4±886.5 yr;
Mean anomaly	359.292°±0.034°
Mean motion	0.203±0.010 arcsec/day
Inclination	4.228°±0.001°
Longitude of ascending node	29.493°±0.005°
Time of perihelion	≈ 4 December 2054; ±1 month
Argument of perihelion	32.037°±0.114°
Jupiter MOID	45.00 AU; (6.7 billion km; 4.2 billion mi)
Physical characteristics
Mean diameter	≈250 km (160 mi)
Geometric albedo	0.05±0.03
Spectral type	moderately red
Apparent magnitude	24.5 (V); 23.67 (peak 2055)
Absolute magnitude (H)	6.7

2013 SY₉₉, also known by its OSSOS survey designation uo3L91, is a trans-Neptunian object discovered on September 29, 2013 by the Outer Solar System Origins Survey using the Canada–France–Hawaii Telescope at Mauna Kea Observatory. This object orbits the Sun between 50 and 1,300 AU (7.5 and 190 billion km), and has a barycentric orbital period of nearly 20,000 years. It has the fourth largest semi-major axis for an orbit with perihelion beyond 38 AU. 2013 SY₉₉ has one of highest perihelia of any known extreme trans-Neptunian object, behind sednoids including Sedna (76 AU), 2012 VP113 (80 AU), and Leleākūhonua (65 AU).

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2013 SY99