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]
Discovery[1] | |
---|---|
Discovered by | LaSilla–Quest Variability Srvy. |
Discovery site | La Silla Observatory |
Discovery date | 30 November 2010 (discovery: first observation only) |
Designations | |
2010 WG9 | |
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 |
52.901 AU | |
Eccentricity | 0.6453 |
384.77 yr (140,538 days) | |
10.821° | |
0° 0m 9.36s / day | |
Inclination | 70.331° |
92.065° | |
293.00° | |
Physical characteristics | |
Dimensions | 100.81 km (calculated)[3] 112.7±61.9 km[4] |
263.8±0.1 h[5] | |
0.074±0.080[4] 0.10 (assumed)[3] | |
B–R = 1.10[6] B–V = 0.798±0.034[5] V–R = 0.520±0.018[5] | |
8.1[1][3] | |
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]
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.
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]