2001 QW322

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2001 QW322
2001 QW322 CFHT image.jpg
2001 QW322 imaged by the Canada-France-Hawaii Telescope in 2001
Discovery [1]
Discovered by
Discovery site Mauna Kea Obs.
Discovery date27 July 2001
Designations
2001 QW322
Orbital characteristics [3]
Epoch 31 May 2020 (JD  2459000.5)
Uncertainty parameter 4
Observation arc 18.11 yr (6,613 days)
Aphelion 44.306  AU (6.6281  Tm)
Perihelion 43.319 AU (6.4804 Tm)
45.294 AU (6.7759 Tm)
Eccentricity 0.02229
294.92  yr (107,720  d)
109.608°
0° 0m 12.031s / day
Inclination 4.7995°
124.635°
92.373°
Known satellites 1 (D: 126 km; P: 6280  d) [1]
Physical characteristics
Mean diameter
128+2
−4  km (primary) [1]
126+3
−5 km(secondary) [1]
Mass (2.150±0.184)×1018 kg [1]
Mean density
1±0.2 g/cm3 [5]
0.093±0.008 [1]
7.8 [3]

    2001 QW322 is a trans-Neptunian object and binary system of the Kuiper belt, located in the outermost region of the Solar System. The cubewano was discovered at the Mauna Kea Observatories on 27 July 2001, by JJ Kavelaars, Jean-Marc Petit, Brett Gladman, and Matthew Holman. Later in 2001, Kavelaars discovered that it is a binary system. The diameter of the two components are estimated at about 128 kilometers (80 miles) and 126 kilometers (78 miles). [4]

    Animation of CFHT images of the 2001 QW322 pair, taken 30 minutes apart to show their motion relative to background stars and galaxies 2001 QW322 CFHT.gif
    Animation of CFHT images of the 2001 QW322 pair, taken 30 minutes apart to show their motion relative to background stars and galaxies
    Components of the 2001 QW322 system resolved by the Hubble Space Telescope in 2017 2001 QW322 Hubble.png
    Components of the 2001 QW322 system resolved by the Hubble Space Telescope in 2017

    In 2008, work was published showing that the binary has an extraordinarily long orbital period (for a binary trans-Neptunian object, asteroid or minor planet) of about 17 years. [5] The orbital radius is also remarkably high (105,000 to 135,000 km) while the eccentricity is unusually low (< 0.4). All of these parameters are in the extremes of their normal ranges for such objects. [5] The wide spacing and low eccentricity conspire to make the system prone to disruption, and its lifetime is estimated to be in the order of another billion years. [5]

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    References

    1. 1 2 3 4 5 6 Johnston, Wm. Robert (20 September 2014). "Asteroids with Satellites Database – 2001 QW322". Johnston's Archive. Retrieved 8 September 2020.
    2. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 01QW322". SwRI (Space Science Department). Retrieved 17 February 2018.
    3. 1 2 3 "JPL Small-Body Database Browser: (2001 QW322)" (2004-10-15 last obs). Retrieved 30 March 2016.
    4. 1 2 Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 8 September 2020.
    5. 1 2 3 4 Petit, J. -M.; Kavelaars, J. J.; Gladman, B. J.; Margot, J. L.; Nicholson, P. D.; Jones, R. L.; et al. (October 2008). "The Extreme Kuiper Belt Binary 2001 QW322" (PDF). Science. 322 (5900): 432–434. Bibcode:2008Sci...322..432P. doi:10.1126/science.1163148. ISSN   0036-8075. PMID   18927391. S2CID   206515135.
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