1803 Zwicky

1803 Zwicky
Discovery
Discovered by	P. Wild
Discovery site	Zimmerwald Obs.
Discovery date	6 February 1967
Designations
MPC designation	(1803) Zwicky
Named after	Fritz Zwicky; (Swiss astronomer)
Alternative designations	1967 CA · 1931 DL
Minor planet category	main-belt · (inner); Phocaea
Orbital characteristics
	Epoch 17 December 2020 (JD 2459200.5)
	Uncertainty parameter 0
Observation arc	90.09 yr (32,907 d)
Aphelion	2.9312 AU
Perihelion	1.7685 AU
Semi-major axis	2.3498 AU
Eccentricity	0.2474
Orbital period (sidereal)	3.60 yr (1,316 d)
Mean anomaly	284.97°
Mean motion	0° 16m 24.96s / day
Inclination	21.553°
Longitude of ascending node	337.24°
Argument of perihelion	253.96°
Known satellites	1 (0.26Ds/Dp; P: 28.5 h)
Physical characteristics
Mean diameter	9.20±0.24 km; 9.934±0.080 km; (Prim.: 9.61±0.08 km); (Sec.: 2.50±0.19 km);
Synodic rotation period	2.73364±0.00005 h
Geometric albedo	0.259±0.038; 0.337;
Spectral type	S
Absolute magnitude (H)	12.23; 12.24

1803 Zwicky, prov. designation: 1967 CA, is a stony Phocaea asteroid and binary system from the inner regions of the asteroid belt, approximately 10 kilometers (6.2 miles) in diameter. It was discovered on 6 February 1967, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland. It was later named after Swiss astronomer Fritz Zwicky. The discovery of a 2.5-kilometer sized companion was announced on 8 March 2021.