(762135) 2010 WG9
Trans-Neptunian object
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(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]
(discovery: first observation only)
| 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] | |
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 (528219) 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]