83982 Crantor

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Crantor
Crantor orbit.tiff
A diagram showing the orbits of Crantor and Jupiter.
Discovery
Discovered by Near-Earth Asteroid Tracking (NEAT) project
Discovery site Palomar
Discovery date 12 April 2002
Designations
MPC designation 83982
Named after
Crantor
2002 GO9
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc 4882 days (13.37 yr)
Aphelion 24.778 AU (3.7067 Tm)
Perihelion 14.017 AU (2.0969 Tm)
19.398 AU (2.9019 Tm)
Eccentricity 0.27738
85.44 yr (31205.2 d)
57.5235°
0.0115365°/day
Inclination 12.78529°
117.4037°
92.6730°
Earth MOID 13.0385 AU (1.95053 Tm)
Jupiter MOID 8.74688 AU (1.308515 Tm)
Physical characteristics
Dimensions 60+15
−13
km[2]
13.94 h (0.581 d)
13.94[1]
8.8[1]

83982 Crantor /ˈkræntɔːr/, provisionally known as 2002 GO9, is a centaur[3] in a 1:1 mean-motion resonance with Uranus.[4][5]

Discovery[edit]

(83982) 2002 GO9 was discovered on April 12, 2002 by the Near-Earth Asteroid Tracking (NEAT) program at Palomar. It is named after the Lapith Crantor.

Orbit[edit]

Crantor follows a moderately eccentric orbit (eccentricity of 0.27) with a semi-major axis of 19.36 AU and an inclination of 12.78º.[6]

Physical properties[edit]

Crantor is a relatively large minor body with an absolute magnitude of H=8.5, translating into a diameter of around 60 km.[6] Water ice has been detected on Crantor with a confidence of more than 3σ (99.7%).[2]

Co-orbital with Uranus[edit]

Crantor was first suggested as a possible co-orbital of Uranus in 2006.[4] Crantor follows a complex, transient horseshoe orbit around Uranus. Classical horseshoe orbits include the Lagrangian points L3, L4, and L5, but Crantor's horseshoe orbit also brings it near Uranus. The motion of Crantor is mainly controlled by the influence of the Sun and Uranus, but Saturn has a significant destabilizing effect. The precession of the nodes of Crantor is accelerated by Saturn, controlling its evolution and short-term stability.[5]

References[edit]

  1. ^ a b c "JPL Small-Body Database Browser: 83982 Crantor". Jet Propulsion Laboratory. Retrieved 25 March 2016. 
  2. ^ a b Near-infrared spectra of centaurs and Kuiper belt objects
  3. ^ MPC list of Centaurs
  4. ^ a b Gallardo, T. (September 2006). "Atlas of the mean motion resonances in the Solar System". Icarus 184 (1): 29–38. Bibcode:2006Icar..184...29G. doi:10.1016/j.icarus.2006.04.001. 
  5. ^ a b de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (March 2013). "Crantor, a short-lived horseshoe companion to Uranus". Astronomy and Astrophysics 551: A114(8 pages). arXiv:1301.0770. Bibcode:2013A&A...551A.114D. doi:10.1051/0004-6361/201220646. 
  6. ^ a b JPL's Solar System Dynamics data on Crantor
Further reading

External links[edit]