(612243) 2001 QR322

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(612243) 2001 QR322
Perihelion
29.262 AU
30.115 AU
Eccentricity0.0283
165.27 yr (60,363 days)
86.551°
0° 0m 21.6s / day
Inclination1.3250°
151.75°
151.11°
Physical characteristics
Mean diameter
132 km[4]
0.058[4]
22.5[5]
8.12[3][2]

(612243) 2001 QR322,

Lagrangian point and measures approximately 132 kilometers (82 miles) in diameter.[2][4]

Other Neptune trojans have been discovered since. A study by American astronomers

Scott Sheppard and Chad Trujillo from the Carnegie Institution suggests that Neptune could possibly have twenty times more trojans than Jupiter.[7]

Orbit

2001 QR322 orbits the Sun with a semi-major axis of 30.115 AU at a distance of 29.3–31.0 AU once every 165 years and 3 months (60,363 days). Its orbit has an eccentricity of 0.03 and an inclination of 1° with respect to the ecliptic.[3]

Dynamical stability

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.[8]

A more recent study, which used a very large number of test particles spread over the 3

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.[8]

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.[8]

Numbering and naming

This

M.P.C. 139893).[1][9] If named, it will follow the naming scheme already established with 385571 Otrera, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.[10]

Physical characteristics

The discoverers estimate that the body has a mean-diameter of 132 kilometers with a low

albedo of 0.058 at an absolute magnitude of 8.12.[4] It has a visual magnitude of 22.5.[5]

References

  1. ^ a b c d "(612243) 2001 QR322". Minor Planet Center. Retrieved 8 April 2022.
  2. ^ a b c "List of Neptune Trojans". Minor Planet Center. 10 July 2017. Retrieved 4 August 2017.
  3. ^ a b c d "JPL Small-Body Database Browser: (2001 QR322)" (2013-11-25 last obs.). Jet Propulsion Laboratory. Archived from the original on 1 September 2020. Retrieved 5 August 2017.
  4. ^ a b c d Johnston, Wm. Robert (2 January 2022). "List of Known Trans-Neptunian Objects". Johnston's Archive.
  5. ^ a b Lakdawalla, Emily (13 August 2010). "2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point". The Planetary Society. Retrieved 8 April 2022.
  6. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 01QR322" (2008-07-21 using 26 of 26 observations). SwRI (Space Science Department). Retrieved 3 September 2009.
  7. ^ "Neptune May Have Thousands of Escorts". Space.com. 30 January 2007. Retrieved 4 September 2009.
  8. ^
    S2CID 119241123
    .
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 8 April 2022.
  10. ^ "Rules and Guidelines for naming non-cometary small Solar-System bodies – v1.0" (PDF). Working Group Small Body Nomenclature (PDF). 20 December 2021.

External links

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