Astronomy:2010 WG9

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2010 WG9
Discovery[1]
Discovered byLaSilla–Quest Variability Srvy.
Discovery siteLa Silla Observatory
Discovery date30 November 2010
(discovery: first observation only)
Designations
2010 WG9
Minor planet categoryTNO[1] · centaur · distant[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc6.22 yr (2,271 days)
|{{{apsis}}}|helion}}87.037 AU
|{{{apsis}}}|helion}}18.765 AU
52.901 AU
Eccentricity0.6453
Orbital period384.77 yr (140,538 days)
Mean anomaly10.821°
Mean motion0° 0m 9.36s / day
Inclination70.331°
Longitude of ascending node92.065°
293.00°
Physical characteristics
Dimensions100.81 km (calculated)[3]
112.7±61.9 km[4]
Rotation period263.8±0.1 h[5]
Geometric albedo0.074±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]
Absolute magnitude (H)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

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 ({{{1}}}).[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]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: (2010 WG9)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3554395. Retrieved 25 July 2017. 
  2. 2.0 2.1 "2010 WG9". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2010+WG9. Retrieved 25 July 2017. 
  3. 3.0 3.1 3.2 3.3 "LCDB Data for (2010)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=0%7C2010+WG9. Retrieved 25 July 2017. 
  4. 4.0 4.1 4.2 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. doi:10.1088/0004-637X/773/1/22. Bibcode2013ApJ...773...22B. 
  5. 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-6256/146/1/17. Bibcode2013AJ....146...17R. 
  6. "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 26 July 2017. 
  7. "Custom query: i = 60 and q = 15+". Minor Planet Center. http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=15&inclination_min=60. Retrieved 26 July 2017. 

External links