(636872) 2014 YX49

(636872) 2014 YX₄₉ (provisional designation 2014 YX₄₉) is a centaur and Uranus co-orbital, approximately 77 kilometers (48 miles) in diameter. Discovered by the Mount Lemmon Survey on November 21, 2006, 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]

(636872) 2014 YX₄₉

Animation of 2014 YX49 relative to Sun and Uranus 1600-2500   2014 YX49 ·   Uranus ·   Sun
Discovery[1]
Discovered by	Mount Lemmon Survey
Discovery site	Mount Lemmon Obs.
Discovery date	November 21, 2006
Designations
MPC designation	2014 YX49
Minor planet category	Uranus trojan centaur[2][3] · distant[1]
Orbital characteristics[2]
Epoch February 16, 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)[3]
Apparent magnitude	21.6
Absolute magnitude (H)	8.8

Description

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's 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 also

• 83982 Crantor
• (472651) 2015 DB216
• (687170) 2011 QF99
• List of centaurs (small Solar System bodies) § 2014 YX49