2010 WG9

2010 WG9
Discovery[1]
Discovered byLaSilla–Quest Variability Srvy.
Discovery siteLa Silla Observatory
Discovery date30 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 arc6.22 yr (2,271 days)
Aphelion87.037 AU
Perihelion18.765 AU
52.901 AU
Eccentricity0.6453
384.77 yr (140,538 days)
10.821°
0° 0m 9.36s / day
Inclination70.331°
92.065°
293.00°
Physical characteristics
Dimensions100.81 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 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]

Orbit and classification

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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

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Rotation period

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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

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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]

References

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  1. ^ a b c d e f "JPL Small-Body Database Browser: (2010 WG9)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 25 July 2017.
  2. ^ a b "2010 WG9". Minor Planet Center. Retrieved 25 July 2017.
  3. ^ a b c d "LCDB Data for (2010)". Asteroid Lightcurve Database (LCDB). Retrieved 25 July 2017.
  4. ^ a b c Bauer, James M.; Grav, Tommy; Blauvelt, Erin; Mainzer, A. K.; Masiero, Joseph R.; Stevenson, Rachel; et al. (August 2013). "Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations". The Astrophysical Journal. 773 (1): 11. arXiv:1306.1862. Bibcode:2013ApJ...773...22B. doi:10.1088/0004-637X/773/1/22. S2CID 51139703.
  5. ^ a b c d Rabinowitz, David; Schwamb, Megan E.; Hadjiyska, Elena; Tourtellotte, Suzanne; Rojo, Patricio (July 2013). "The Peculiar Photometric Properties of 2010 WG9: A Slowly Rotating Trans-Neptunian Object from the Oort Cloud". The Astronomical Journal. 146 (1): 10. arXiv:1305.5134. Bibcode:2013AJ....146...17R. doi:10.1088/0004-6256/146/1/17. S2CID 119206739.
  6. ^ "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 26 July 2017.
  7. ^ "Custom query: i = 60 and q = 15+". Minor Planet Center. Retrieved 26 July 2017.
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