475 Ocllo

475 Ocllo is a large Mars-crossing asteroid.^[2] It was discovered by American astronomer DeLisle Stewart on August 14, 1901 and was assigned a provisional name of 1901 HN.^[5][6]

475 Ocllo

Discovery
Discovered by	D. Stewart
Discovery date	14 August 1901
Designations
MPC designation	(475) Ocllo
Pronunciation	/ˈɒkloʊ/
Named after	Mama Uqllu, legendary first queen of the Kingdom of Cuzco
Alternative designations	1901 HN; 1959 JS; 1979 DD
Minor planet category	Mars-crosser
Orbital characteristics[1][2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	97.47 yr (35601 d)
Aphelion	3.5821 AU (535.87 Gm)
Perihelion	1.60661 AU (240.345 Gm)
Semi-major axis	2.59436 AU (388.111 Gm)
Eccentricity	0.38073
Orbital period (sidereal)	4.18 yr (1526.3 d)
Mean anomaly	174.037°
Mean motion	0° 14m 9.096s / day
Inclination	18.926°
Longitude of ascending node	34.496°
Argument of perihelion	305.68°
Earth MOID	0.670978 AU (100.3769 Gm)
Mars MOID	0.3173 AU (47.47 Gm)
Physical characteristics
Dimensions	11–25 km[3]
Mass	3.1×1016? kg
Mean density	2.0? g/cm3
Synodic rotation period	7.3151 h (0.30480 d)[2][4]
Spectral type	X[2]
Absolute magnitude (H)	11.88[2]

Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a light curve with a period of 7.3151 ± 0.0002 hours and a brightness variation of 0.66 ± 0.04 in magnitude.^[4]