1939 Loretta
| Discovery [1] | |
|---|---|
| Discovered by | C. Kowal |
| Discovery site | Palomar Obs. |
| Discovery date | 17 October 1974 |
| Designations | |
| MPC designation | 1939 Loretta |
|
Named after
|
Loretta Kowal (daughter of discoverer)[2] |
| 1974 UC · 1934 JE 1934 LQ · 1939 EH 1939 GP · 1950 DT 1950 ES · 1951 MF 1955 CA · 1969 TE5 1975 TZ5 · 1975 XW |
|
| main-belt · Themistian [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.64 yr (23,975 days) |
| Aphelion | 3.5185 AU |
| Perihelion | 2.7236 AU |
| 3.1211 AU | |
| Eccentricity | 0.1273 |
| 5.51 yr (2,014 days) | |
| 241.41° | |
| Inclination | 0.9073° |
| 40.407° | |
| 190.25° | |
| Physical characteristics | |
| Dimensions | 29.96 km 29.08±0.51 km[4] 30.243±0.335 km[5] 26.34±0.46 km[6] 29.87 km (derived)[3] |
| 25 h[7] | |
| 0.0942 0.103±0.004[4] 0.0927±0.0089[5] 0.101±0.020[6] 0.0788 (derived)[3] |
|
| C [3] | |
| 11.0 | |
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1939 Loretta, provisional designation 1974 UC, is a dark, carbonaceous asteroid from the outer region of the asteroid belt, about 30 kilometers in diameter. It was discovered by American astronomer Charles Kowal at Palomar Observatory in San Diego County, California on 17 October 1974.[8]
The C-type asteroid orbits the Sun at a distance of 2.7–3.5 AU once every five and a half years (2,014 days). With a semi-major axis of 3.12 AU, an eccentricity of 0.13 and a nearly coplanar orbit to the ecliptic– inclined by only 0.9 degrees, it is a typical member of the Themis family, a large group of outer-belt asteroids with similar orbital and spectral characteristics, named after the family's namesake and largest member, 24 Themis.[1][3]
Loretta has a relatively long rotation period of 25 hours, as measured by French astronomer Pierre Antonini in 2011.[7] Its geometric albedo of 0.103±0.004, 0.0927±0.0089 and 0.101±0.020 has been determined by the Akari, WISE and NEOWISE surveys, respectively.[4][5][6]
The discoverer named the Themistian asteroid after his daughter, Loretta Kowal.[2]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Geneve, Raoul Behrend
- 1939 Loretta at the JPL Small-Body Database
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