1345 Potomac
1345 Potomac (/pəˈtoʊmək/ ⓘ), 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.
Discovery | |
---|---|
Discovered by | J. H. Metcalf |
Discovery site | Taunton Obs. |
Discovery date | 4 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 arc | 111.20 yr (40,617 d) |
Aphelion | 4.7100 AU |
Perihelion | 3.2611 AU |
Semi-major axis | 3.9856 AU |
Eccentricity | 0.1818 |
Orbital period (sidereal) | 7.96 yr (2,906 d) |
Mean anomaly | 31.380° |
Mean motion | 0° 7m 26.04s / day |
Inclination | 11.402° |
Longitude of ascending node | 137.43° |
333.12° | |
Jupiter MOID | 0.4592 AU |
TJupiter | 2.9930 |
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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