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2014 YX49 is a centaur and Uranus co-orbital first observed on December 26, 2014, by the Pan-STARRS survey.[3] It is the second known centaur on a tadpole orbit with Uranus, and the fourth Uranus co-orbital discovered after 83982 Crantor, 2011 QF99 and (472651) 2015 DB216.[4]

2014 YX49
Discovered byPan-STARRS
Discovery dateDecember 26, 2014
MPC designation2014 YX49
Uranus Co-orbital
Orbital characteristics[2]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 1
Observation arc4876 days (13.35 yr)
Aphelion24.4207 AU (3.65328 Tm)
Perihelion13.8401 AU (2.07045 Tm)
19.1304 AU (2.86187 Tm)
83.67 yr (30562 d)
Earth MOID12.9424 AU (1.93616 Tm)
Jupiter MOID9.47006 AU (1.416701 Tm)
Physical characteristics
Dimensions40–120 km[1]

Asteroid 2014 YX49 is a temporary L4 Trojan of Uranus, the second one (2011 QF99 was identified first) to be confirmed as currently trapped in such resonant state. This object may have remained as a L4 Uranian Trojan for about 60,000 years and it can continue that way for another 80,000 years. Numerical integrations suggest that it may stay within Uranus’ co-orbital zone for nearly one million years.[4]

Besides being a L4 Uranian Trojan, 2014 YX49 is trapped in the 7:20 mean motion resonance with Saturn as well; therefore, this minor body is currently subjected to a three-body resonance.[4] The other known Uranian Trojan, 2011 QF99, is also in this resonant configuration.


See alsoEdit


  1. ^ Assuming an albedo from 0.05 (120 km) to 0.5 (40 km).


  1. ^ "2014 YX49 - Minor Planet Center". Minor Planet Center. International Astronomical Union. Retrieved 20 January 2017.
  2. ^ "JPL Small Body Database Browser". JPL (2015-01-28 last obs.). NASA. Retrieved 20 January 2017.
  3. ^ "MPEC 2016-O10 : 2014 YX49". Minor Planet Center. International Astronomical Union. Retrieved 20 January 2017.
  4. ^ a b c de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (15 May 2017). "Asteroid 2014 YX49: a large transient Trojan of Uranus". Monthly Notices of the Royal Astronomical Society. 467 (2): 1561–1568. arXiv:1701.05541. Bibcode:2017MNRAS.467.1561D. doi:10.1093/mnras/stx197.

External linksEdit