2013 SY99
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).
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 |
|
| Perihelion | 50.029 ± 0.056 AU (7.48 ± 0.01 billion km; 4.65 ± 0.01 billion mi) |
Semi-major axis |
|
| Eccentricity | 0.9274±0.0024 |
Orbital period (sidereal) |
|
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° |
| ≈ 4 December 2054 ±1 month | |
| 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) |
| 0.05±0.03 | |
| moderately red | |
| 24.5 (V) 23.67 (peak 2055) | |
| 6.7 | |
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