2010 FX86

2010 FX₈₆ is a relatively bright trans-Neptunian object^[2] with an absolute magnitude of about 4.65.^[2][3][6]

2010 FX₈₆

Discovery[1]
Discovered by	S. S. Sheppard, A. Udalski, I. Soszynski
Discovery site	Las Campanas Observatory, Chile
Discovery date	17 March 2010
Designations
MPC designation	2010 FX86
Minor planet category	TNO[2] distant[3]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 3
Observation arc	2634 days (7.21 yr)
Aphelion	50.161 AU (7.5040 Tm)
Perihelion	44.109 AU (6.5986 Tm)
Semi-major axis	47.135 AU (7.0513 Tm)
Eccentricity	0.064199
Orbital period (sidereal)	323.61 yr (118199 d)
Mean anomaly	295.094°
Mean motion	0° 0m 10.965s /day
Inclination	25.1697°
Longitude of ascending node	311.074°
Time of perihelion	≈ 25 February 2084[4] ±44 days
Argument of perihelion	347.887°
Earth MOID	43.0966 AU (6.44716 Tm)
Jupiter MOID	39.0007 AU (5.83442 Tm)
Physical characteristics
Mean diameter	305–682 km[2][3][5][a] 549 km[6][b]
Synodic rotation period	15.80 h (0.658 d)[2][c]
Geometric albedo	0.09 (assumed)[6]
Absolute magnitude (H)	4.7[2][3] 4.6[6]

It was first discovered on 17 March 2010, at Las Campanas Observatory in Chile, by S. S. Sheppard, A. Udalski and I. Soszynski. No earlier precovery images for it have been found. It is estimated to be about 520 kilometres (320 mi) in diameter,^[6] with a rotation period of approximately 15.80 hours,^[2] but as of yet no detailed photometry has been taken to properly determine colour or albedo, or to better confirm its rotational lightcurve.

2010 FX86 has not yet been imaged by high-resolution telescopes, so it has no known moons. The Hubble Space Telescope is planned to image it in 2026, which should determine if it has significantly sized moons.^[7]

Notes

1. Using 4.6 mag, Bruton formula, and typical estimated albedo for minor planets of 0.25 to 0.05; mean is 493.5 km
2. estimated
3. "Result based on less than full coverage, so that the period may be wrong by 30 percent or so."