111 Ate

For other uses, see Ate (disambiguation).

111 Ate is a main-belt asteroid discovered by the German-American astronomer C. H. F. Peters on August 14, 1870,^[6] and named after Ate, the goddess of mischief and destruction in Greek mythology. In the Tholen classification system, it is categorized as a carbonaceous C-type asteroid, while the Bus asteroid taxonomy system lists it as an Ch asteroid.^[5]

111 Ate

Orbital diagram
Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	14 August 1870
Designations
MPC designation	(111) Ate
Pronunciation	/ˈeɪtiː/[1]
Named after	Ate
Alternative designations	A870 PA; 1911 KE; 1935 AA
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	145.66 yr (53202 d)
Aphelion	2.8614 AU (428.06 Gm)
Perihelion	2.32553 AU (347.894 Gm)
Semi-major axis	2.59349 AU (387.981 Gm)
Eccentricity	0.10332
Orbital period (sidereal)	4.18 yr (1525.5 d)
Average orbital speed	18.44 km/s
Mean anomaly	190.607°
Mean motion	0° 14m 9.532s / day
Inclination	4.9318°
Longitude of ascending node	305.757°
Argument of perihelion	166.424°
Earth MOID	1.34088 AU (200.593 Gm)
Jupiter MOID	2.23131 AU (333.799 Gm)
TJupiter	3.406
Physical characteristics
Dimensions	126.34 km[2] 142.85 ± 5.94 km[3]
Mass	(1.76 ± 0.44) × 1018 kg[3]
Mean density	1.15 ± 0.32 g/cm3[3]
Equatorial surface gravity	0.0376 m/s²
Equatorial escape velocity	0.0712 km/s
Synodic rotation period	22.072 h (0.9197 d)[2] 22.072 ± 0.001 h[4]
Geometric albedo	0.0605±0.004
Temperature	~173 K
Spectral type	C[5]
Absolute magnitude (H)	8.02

Two stellar occultations by Ate were observed in 2000, two months apart. Its occultation of the star HIP 2559 was used to determine a chord length of 125.6 ± 7.2 km through the asteroid, giving a lower bound on the maximum dimension.^[7] During 2000, 111 Ate was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 135 ± 15 km.^[8] The estimated size of this asteroid is 143 km,^[3] making it one of the larger asteroids.

Based upon an irregular light curve generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 22.072 ± 0.001 hours and varies in brightness by 0.12 ± 0.01 in magnitude.^[4]