202 Chryseïs

202 Chryseïs is a large, lightly coloured Main belt asteroid that is probably composed of silicate rocks. It was discovered by C. H. F. Peters on September 11, 1879, in Clinton, New York, and was named after the mythical Trojan woman Chryseis.

202 Chryseïs

Orbital diagram
Discovery
Discovered by	C. H. F. Peters
Discovery date	11 September 1879
Designations
MPC designation	(202) Chryseïs
Pronunciation	/kraɪˈsiːɪs/[1]
Named after	Chryseis
Alternative designations	A879 RA, A901 TA 1935 BL
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	136.57 yr (49881 d)
Aphelion	3.3859 AU (506.52 Gm)
Perihelion	2.7567 AU (412.40 Gm)
Semi-major axis	3.0713 AU (459.46 Gm)
Eccentricity	0.10244
Orbital period (sidereal)	5.38 yr (1966.0 d)
Average orbital speed	16.99 km/s
Mean anomaly	11.1527°
Mean motion	0° 10m 59.196s / day
Inclination	8.8535°
Longitude of ascending node	136.848°
Argument of perihelion	1.3159°
Physical characteristics
Dimensions	86.15±2.4 km
Synodic rotation period	23.670 h (0.9863 d)[2] 23.670 ± 0.001 h[3]
Geometric albedo	0.2562±0.015
Spectral type	S
Absolute magnitude (H)	7.42

The rotation period for this asteroid is close to a day long, so the construction of a complete light curve requires photometric observations from multiple locations at widely spaced latitudes. This task was completed in January and February, 2011, yielding a synodic rotation period of 23.670 ± 0.001 h, with a brightness variation of 0.20 ± 0.02 in magnitude^[3]