1345 Potomac

1345 Potomac (/pəˈtmək/ ), provisional designation 1908 CG, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 73 kilometers (45 mi) in diameter. It was discovered on 4 February 1908, by American astronomer Joel Metcalf at the Taunton Observatory (803) in Massachusetts, United States. The X-type asteroid has a rotation period of 11.4 hours. It was named for the Potomac River on which Washington, D.C. is located.

1345 Potomac
Discovery
Discovered byJ. H. Metcalf
Discovery siteTaunton Obs.
Discovery date4 February 1908
Designations
MPC designation
(1345) Potomac
Named after
Potomac River
(U.S. Mid-Atlantic river)
Alternative designations
1908 CG · 1932 CF
1932 EA · 1932 FB
1971 DE2
Minor planet category
main-belt · (outer)
Hilda · background
Orbital characteristics
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc111.20 yr (40,617 d)
Aphelion4.7100 AU
Perihelion3.2611 AU
Semi-major axis
3.9856 AU
Eccentricity0.1818
Orbital period (sidereal)
7.96 yr (2,906 d)
Mean anomaly
31.380°
Mean motion
0° 7m 26.04s / day
Inclination11.402°
Longitude of ascending node
137.43°
333.12°
Jupiter MOID0.4592 AU
TJupiter2.9930
Physical characteristics
Mean diameter
71.82±3.0 km
72.975±0.463 km
76.72±2.34 km
Synodic rotation period
11.41±0.01 h
0.039±0.003
0.043±0.008
0.0439±0.004
Tholen = X · C
B–V = 0.719
U–B = 0.286
9.73
9.9
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