(309239) 2007 RW10

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
(309239) 2007 RW10
Discovered by PDSSS
Discovery date 9 September 2007
TNO[1] · Nept. co-orbital
centaur · distant
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc 8154 days (22.32 yr)
Aphelion 39.20412 AU (5.864853 Tm)
Perihelion 21.11597 AU (3.158904 Tm)
30.16005 AU (4.511879 Tm)
Eccentricity 0.29987
165.64 yr (60498.8 d)
0° 0m 21.422s / day
Inclination 36.17157°
Earth MOID 20.3005 AU (3.03691 Tm)
Jupiter MOID 17.1805 AU (2.57017 Tm)
TJupiter 3.881
Physical characteristics
Dimensions 247±30 km[2]

(309239) 2007 RW10, provisionally known as 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.


(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


  1. ^ a b c d "JPL Small-Body Database Browser: 2007 RW10". Retrieved 8 April 2016. 
  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:1209.1577Freely accessible. Bibcode:2012A&A...545L...9D. doi:10.1051/0004-6361/201219931. 
  4. ^ "Discovery MPEC". Retrieved 2012-07-26. 
  5. ^ Schwamb, Megan E.; et al. (September 2010). "Properties of the Distant Kuiper Belt: Results from the Palomar Distant Solar System Survey". arXiv:1007.2954Freely accessible. Bibcode:2010ApJ...720.1691S. doi:10.1088/0004-637X/720/2/1691. 
  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. 422 (3): 2145–2151. arXiv:1202.3279Freely accessible. Bibcode:2012MNRAS.422.2145H. doi:10.1111/j.1365-2966.2012.20757.x. 

External links[edit]