|Discovered by||S. Ueda|
|Discovery site||Kushiro Obs.|
|Discovery date||4 February 1994|
|(7352) 1994 CO|
|1994 CO · 1991 VD3|
|Jupiter trojan |
Trojan  · background 
|Orbital characteristics |
|Epoch 23 March 2018 (JD 2458200.5)|
|Uncertainty parameter 0|
|Observation arc||29.75 yr (10,868 d)|
|11.63 yr (4,247 d)|
|0° 5m 5.28s / day|
|Jupiter MOID||0.0307 AU|
B–V = 0.660±0.060
V–R = 0.460±0.040
V–I = 0.850±0.027
(7352) 1994 CO, provisional designation 1994 CO, is a larger Jupiter trojan from the Trojan camp, approximately 48 kilometers (30 miles) in diameter. The tumbling Jovian asteroid is a slow rotator with an exceptionally long rotation period of 648 hours. It was discovered on 4 February 1994 by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaidō, Japan, and has not been named since its numbering in December 1996.
1994 CO is a Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit . It is also a non-family asteroid of the Jovian background population.
It orbits the Sun at a distance of 4.9–5.3 AU once every 11 years and 8 months (4,247 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.04 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with a precovery taken at the Palomar Observatory in August 1988, more than 5 years prior to its official discovery observation at Kushiro.
In the SDSS-based taxonomy, 1994 CO is classified as an X/L-type. This is unusual as most Jupiter trojans are D-types, with the reminder being mostly C- and P-type asteroids. It has a V–I color index of 0.85.
In October 2013, a rotational lightcurve was obtained for this asteroid from photometric observations by American amateur astronomer Robert Stephens at the Trojan Station (U81) of the Center for Solar System Studies in Landers, California. It gave a well-defined, outstandingly long rotation period of 648±3 hours with a brightness variation of 0.30 magnitude (U=3-).[a] As of 2018, there are only about three dozens known slow rotators with periods longer than that of 1994 CO.
The astronomers also detected a non-principal axis rotation seen in distinct rotational cycles in successive order. This is commonly known as tumbling. 1994 CO is the six-largest asteroid and the second-largest Jupiter trojan after 4902 Thessandrus known to be is such a state (also see list of tumblers).
According to the space-based surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1994 CO measures 47.07 and 47.73 kilometers in diameter and its surface has an albedo of 0.207 and 0.093, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a larger diameter of 55.67 kilometers, based on an absolute magnitude of 10.0.