(144908) 2004 YH32

(144908) 2004 YH₃₂, provisional designation 2004 YH₃₂, is a centaur and damocloid orbiting the Sun with a very high inclination of almost 80°.^[3] It was discovered on 18 December 2004 by the Siding Spring Survey at the Siding Spring Observatory in Australia. The critical and unusual object measures approximately 12 kilometers (7.5 miles) in diameter.^[1]

(144908) 2004 YH₃₂

Discovery[1][2]
Discovered by	SSS
Discovery site	Siding Spring Obs.
Discovery date	18 December 2004
Designations
MPC designation	(144908) 2004 YH32
Alternative designations	2004 YH32
Minor planet category	centaur[3] · damocloid[4] unusual[5] · distant[1]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 3
Observation arc	2.08 yr (758 d)
Aphelion	12.777 AU
Perihelion	3.5507 AU
Semi-major axis	8.1641 AU
Eccentricity	0.5651
Orbital period (sidereal)	23.33 yr (8,520 d)
Mean anomaly	212.33°
Mean motion	0° 2m 32.28s / day
Inclination	78.978°
Longitude of ascending node	47.727°
Argument of perihelion	348.73°
TJupiter	1.0330
Physical characteristics
Mean diameter	12 km[4]
Geometric albedo	0.09 (assumed)[4]
Absolute magnitude (H)	12.9[1][3]

Orbit and classification

It orbits the Sun at a distance of 3.6–12.8 AU once every 23 years and 4 months (8,520 days; semi-major axis of 8.16 AU). Its orbit has an eccentricity of 0.57 and an inclination of 79° with respect to the ecliptic.^[3] The body's observation arc begins with its official discovery observation at the Siding Spring Observatory in December 2004.^[1]

Physical characteristics

Johnston's Archive assumes a standard albedo of 0.09 and calculates a diameter of 12 kilometers based on an absolute magnitude of 12.9.^[4]