|Discovered by||Deep Ecliptic Survey|
|Discovery date||21 August 2001|
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 3|
|Observation arc||2605 days (7.13 yr)|
|Aphelion||30.955 AU (4.6308 Tm)|
|Perihelion||29.338 AU (4.3889 Tm)|
|30.147 AU (4.5099 Tm)|
|165.53 yr (60458.2 d)|
|0° 0m 21.436s /day|
|Earth MOID||28.3211 AU (4.23678 Tm)|
|Jupiter MOID||24.1875 AU (3.61840 Tm)|
Other Neptune trojans have been discovered since. A study by Scott S. Sheppard and Chad Trujillo from the Carnegie Institution suggests that Neptune could possibly have twenty times more trojans than Jupiter.
Early studies of the dynamical stability of 2001 QR322, which used a small number of test particles spread over the uncertainties of just a few orbital parameters that were derived from a limited observation arc, suggested that 2001 QR322 is on a remarkably stable orbit, because most test particles remained on trojan orbits for 5 Gyr. Thereafter, the stability of Neptune trojans was simply assumed.
A more recent study, which used a very large number of test particles spread over the 3σ uncertainties in all six orbital parameters derived from a longer observational arc, has indicated that 2001 QR322 is far less dynamically stable than previously thought. The test particles were lost exponentially with a half life of 553 Myr. Further observations can determine whether 2001 QR322's orbit is actually within the dynamically stable or within the unstable part.
The stability is strongly dependent on semi-major axis, with a≥30.30 AU being far less stable, but only very weakly dependent on the other orbital parameters. This is because those with larger semi-major axes have larger libration amplitudes, with amplitudes ~70° and above being destabilized by secondary resonances between the trojan motion and the dynamics of at least Saturn, Uranus, and Neptune. Secular resonances were found not to contribute to the dynamical stability of 2001 QR322.
- "JPL Small-Body Database Browser: (2001 QR322)" (2008-07-21 last obs). Retrieved 30 March 2016.
- "List Of Neptune Trojans". Minor Planet Center. Retrieved 2011-05-08.
- "Absolute Magnitude (H)". Archived from the original on 14 May 2008. Retrieved 2008-05-08.
- Marc W. Buie. "Orbit Fit and Astrometric record for 01QR322" (2008-07-21 using 26 of 26 observations). SwRI (Space Science Department). Retrieved 2009-09-03.
- "Neptune May Have Thousands of Escorts". Space.com. 30 January 2007. Retrieved 2009-09-04.
- Horner, J.; Lykawka, P. S. (June 2010). "2001 QR322: a dynamically unstable Neptune Trojan?" (pdf). Monthly Notices of the Royal Astronomical Society 405 (1): 49–56. arXiv:1002.4699. Bibcode:2010MNRAS.405...49H. doi:10.1111/j.1365-2966.2010.16441.x. Retrieved 2012-03-20.