(636872) 2014 YX49

(636872) 2014 YX₄₉
	Animation of 2014 YX49 relative to Sun and Uranus 1600-2500; 2014 YX49 · Uranus · Sun
Discovery
Discovered by	Pan-STARRS
Discovery site	Haleakala Obs.
Discovery date	December 26, 2014
Designations
MPC designation	2014 YX49
Minor planet category	Uranus trojan centaur · distant
Orbital characteristics
	Epoch 16 February 2017 (JD 2457800.5)
	Uncertainty parameter 1
Observation arc	4876 days (13.35 yr)
Aphelion	24.4207 AU (3.65328 Tm)
Perihelion	13.8401 AU (2.07045 Tm)
Semi-major axis	19.1304 AU (2.86187 Tm)
Eccentricity	0.276539
Orbital period (sidereal)	83.67 yr (30562 d)
Mean anomaly	75.587°
Inclination	25.55097°
Longitude of ascending node	91.44425°
Argument of perihelion	280.584°
Earth MOID	12.9424 AU (1.93616 Tm)
Jupiter MOID	9.47006 AU (1.416701 Tm)
Physical characteristics
Mean diameter	77 km (est. at 0.09)
Apparent magnitude	21.6
Absolute magnitude (H)	8.8

(636872) 2014 YX₄₉ (provisional designation 2014 YX₄₉) is a centaur and Uranus co-orbital, approximately 77 kilometers (48 miles) in diameter, first observed on December 26, 2014, by the Pan-STARRS survey.^[4] 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.^[5]

Description

Centaur 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 a 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.^[5]

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.^[5] The other known Uranian trojan, 2011 QF₉₉, is also in this resonant configuration.

References

^ ^a ^b "2014 YX49 - Minor Planet Center". Minor Planet Center. International Astronomical Union. Retrieved January 20, 2017.
^ ^a ^b "JPL Small Body Database Browser". JPL (2015-01-28 last obs.). NASA. Retrieved January 20, 2017.
^ ^a ^b Johnston, Wm. Robert (August 18, 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved August 12, 2021.
^ "MPEC 2016-O10 : 2014 YX49". Minor Planet Center. International Astronomical Union. Retrieved January 20, 2017.
^ ^a ^b ^c de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (May 15, 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.