1345 Potomac
| Discovery[1] | |
|---|---|
| Discovered by | J. H. Metcalf |
| Discovery site | Taunton Obs. |
| Discovery date | 4 February 1908 |
| Designations | |
| (1345) Potomac | |
Named after | Potomac River[2] (U.S. Mid-Atlantic river) |
| 1908 CG · 1932 CF 1932 EA · 1932 FB 1971 DE2 | |
| main-belt · (outer)[3] Hilda[1][4] · background[5] | |
| Orbital characteristics[3] | |
| 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 |
| 3.9856 AU | |
| Eccentricity | 0.1818 |
| 7.96 yr (2,906 d) | |
| 31.380° | |
| 0° 7m 26.04s / day | |
| Inclination | 11.402° |
| 137.43° | |
| 333.12° | |
| Jupiter MOID | 0.4592 AU |
| TJupiter | 2.9930 |
| Physical characteristics | |
| 71.82±3.0 km[6] 72.975±0.463 km[7] 76.72±2.34 km[8] | |
| 11.41±0.01 h[9] | |
| 0.039±0.003[8] 0.043±0.008[7] 0.0439±0.004[6] | |
| Tholen = X[3] · C[4][10] B–V = 0.719[3] U–B = 0.286[3] | |
| 9.73[3][4][6][8] 9.9[1] | |
1345 Potomac (/pəˈtoʊmək/ Audio file "En-us-Potomac.ogg" not found), 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.[1] The X-type asteroid has a rotation period of 11.4 hours.[4] It was named for the Potomac River on which Washington, D.C. is located.[2]
Orbit and classification
[edit | edit source]Potomac is member of the dynamical Hilda group, which stays in 3:2 orbital resonance with Jupiter.[1][4] It is, however, not a member of the Hilda family but a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[5]
It orbits the Sun in the outermost asteroid belt at a distance of 3.3–4.7 AU once every 7 years and 12 months (2,910 days; semi-major axis of 3.99 AU). Its orbit has an eccentricity of 0.18 and an inclination of 11° with respect to the ecliptic.[3] The body's observation arc begins at the United States Naval Observatory, three weeks after its official discovery observation at Taunton.[1]
Naming
[edit | edit source]This minor planet was named after the U.S. Potomac River in the Mid-Atlantic region of the United States, on which Washington, D.C. is located. The river flows from West Virginia into the Chesapeake Bay and forms the southern boundary of Maryland. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 122).[2]
Physical characteristics
[edit | edit source]In the Tholen classification, Potomac is an X-type asteroid.[3] It has also been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[10]
Rotation period
[edit | edit source]Two rotational lightcurves of Potomac was obtained from photometric observations. Lightcurve analysis gave a rotation period of 11.40 and 11.41 hours with a brightness amplitude of 0.22 and 0.24 magnitude, respectively (U=2/3).[11][9]
Diameter and albedo
[edit | edit source]According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Potomac measures between 71.82 and 76.72 kilometers in diameter and its surface has an albedo between 0.039 and 0.0439.[6][7][8]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0439 and a diameter of 71.82 kilometers based on an absolute magnitude of 9.73.[4]
References
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External links
[edit | edit source]- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1345 Potomac at AstDyS-2, Asteroids—Dynamic Site
- 1345 Potomac at the JPL Small-Body DatabaseLua error in Module:EditAtWikidata at line 29: attempt to index field 'wikibase' (a nil value).
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