(309239) 2007 RW10

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(309239) 2007 RW10
Discovery
Discovered by PDSSS
Discovery date September 9, 2007
Designations
Minor planet category trans-Neptunian object
Orbital characteristics[1]
Epoch September 30, 2012 (JD 2456200.5)
Aphelion 39.40621 AU
Perihelion 21.23889 AU
30.32255 AU
Eccentricity 0.29957
166.98 yr
58.95071°
Inclination 36.06825°
187.03214°
96.73413°
Physical characteristics
Dimensions 247±30 km[2]
Albedo 0.083+0.068
−0.039
[2]
6.5[1]

(309239) 2007 RW10, also written (309239) 2007 RW10, is a temporary quasi-satellite of Neptune.[3] Observed from Neptune, it would appear to go around it during one Neptunian year but it actually orbits the Sun, not Neptune.

Discovery, orbit and physical properties[edit]

(309239) 2007 RW10 was discovered by the Palomar Distant Solar System Survey on September 9, 2007.[4][5] At the time of discovery, this minor body was believed to be a Neptune trojan,[6] but it is no longer listed as such.[7][8] The Jet Propulsion Laboratory classifies (309239) 2007 RW10 as trans-Neptunian object but the Minor Planet Center includes the object among centaurs. It moves in an orbit with an inclination of 36.1°, a semi-major axis of 30.32 AU, and an eccentricity of 0.2996.[1] Herschel-PACS observations indicate that it has a diameter of 247 km.[2]

Quasi-satellite dynamical state and orbital evolution[edit]

(309239) 2007 RW10 is currently following a quasi-satellite loop around Neptune.[3] It has been a quasi-satellite of Neptune for about 12,500 years and it will remain in that dynamical state for another 12,500 years.[3] Prior to the quasi-satellite dynamical state, (309239) 2007 RW10 was an L5 trojan and it will go back to that state soon after leaving its current quasi-satellite orbit. Its orbital inclination is the largest among known Neptune co-orbitals. It is also possibly the largest known object trapped in the 1:1 mean-motion resonance with any major planet.

Origin[edit]

(309239) 2007 RW10 is a dynamically hot (both, high eccentricity and inclination) object that is unlikely to be a primordial Neptune co-orbital. It probably originated well beyond Neptune and was later temporarily captured in the 1:1 commensurability with Neptune.[3][9]

See also[edit]

  • 2005 TN74, which was also suspected of being a Neptune trojan at the time of discovery

References[edit]

  1. ^ a b c "JPL Small-Body Database Browser: 2007 RW10". Retrieved 2012-07-24. 
  2. ^ a b c Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. (2012). “TNOs are Cool”: A Survey of the Transneptunian Region IV - Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS
  3. ^ a b c d de la Fuente Marcos, C.; de la Fuente Marcos, R. (2012). "(309239) 2007 RW10: a large temporary quasi-satellite of Neptune". Astronomy and Astrophysics Letters 545: L9. arXiv:1209.1577. Bibcode:2012A%26A...545L...9D. doi:10.1051/0004-6361/201219931. 
  4. ^ "Discovery MPEC". Retrieved 2012-07-26. 
  5. ^ "Schwamb et al. 2010". Retrieved 2012-07-26. 
  6. ^ "Distant EKOs, 55". Retrieved 2012-07-24. 
  7. ^ "Distant EKOs 56". Retrieved 2012-07-24. 
  8. ^ Minor Planet Center List Of Neptune Trojans (2007-12-01)
  9. ^ Horner, J., Lykawka, P. S., Bannister, M. T., & Francis, P. 2012 2008 LC18: a potentially unstable Neptune Trojan Monthly Notices of the Royal Astronomical Society, Volume 422, pp. 2145-2151

External links[edit]