(762135) 2010 WG9

(762135) 2010 WG₉ is a high inclination trans-Neptunian object and slow rotator from the outer Solar System, approximately 100 kilometers in diameter.^[1] It was first observed at ESO's La Silla Observatory in northern Chile on 30 November 2010.^[2]

(762135) 2010 WG₉

Discovery[1]
Discovered by	LaSilla–Quest Variability Srvy.
Discovery site	La Silla Observatory
Discovery date	30 November 2010 (discovery: first observation only)
Designations
MPC designation	2010 WG9
Minor planet category	TNO[1] · centaur · distant[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc	6.22 yr (2,271 days)
Aphelion	87.037 AU
Perihelion	18.765 AU
Semi-major axis	52.901 AU
Eccentricity	0.6453
Orbital period (sidereal)	384.77 yr (140,538 days)
Mean anomaly	10.821°
Mean motion	0° 0m 9.36s / day
Inclination	70.331°
Longitude of ascending node	92.065°
Argument of perihelion	293.00°
Physical characteristics
Dimensions	100.81 km (calculated)[3] 112.7±61.9 km[4]
Synodic rotation period	263.8±0.1 h[5]
Geometric albedo	0.074±0.080[4] 0.10 (assumed)[3]
Spectral type	B–R = 1.10[6] B–V = 0.798±0.034[5] V–R = 0.520±0.018[5]
Absolute magnitude (H)	8.1[1][3]

Orbit and classification

2010 WG₉ orbits the Sun at a distance of 18.8–87.0 AU once every 384 years and 9 months (140,538 days). Its orbit has an eccentricity of 0.65 and an inclination of 70° with respect to the ecliptic.^[1]

As of October 2019, it is one of six known objects with inclination (i) > 60° and perihelion (q) > 15 AU, along with the first discovered 2008 KV42.^[7]

Physical characteristics

Rotation period

A rotational lightcurve of 2010 WG₉ was obtained from photometric observations by the LaSilla–Quest Variability Survey at La Silla in Chile. Lightcurve analysis gave a rotation period of 263.8 hours with a brightness amplitude of 0.14 magnitude (U=2).^[5] It belongs to the Top 200 slowest rotators known to exist.

Diameter and albedo

It measures 112.7 kilometers in diameter and its surface has an albedo of 0.074.^[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.10 and calculates a diameter of 100.81 kilometers based on an absolute magnitude of 8.1.^[3]