7476 Ogilsbie
Main-belt asteroid
From Wikipedia, the free encyclopedia
7476 Ogilsbie, provisional designation 1993 GE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered by American astronomer Timothy Spahr at the U.S. Catalina Station in Tucson, Arizona, on 14 April 1993.[7]
(friend of discoverer)[2]
| Discovery[1] | |
|---|---|
| Discovered by | T. B. Spahr |
| Discovery site | Catalina Stn. |
| Discovery date | 14 April 1993 |
| Designations | |
Named after | Brian Ogilsbie (friend of discoverer)[2] |
| 1993 GE · 1971 HU | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.82 yr (23,312 days) |
| Aphelion | 3.8716 AU |
| Perihelion | 2.4313 AU |
| 3.1514 AU | |
| Eccentricity | 0.2285 |
| 5.59 yr (2,043 days) | |
| 120.00° | |
| 0° 10m 34.32s / day | |
| Inclination | 25.775° |
| 57.490° | |
| 145.45° | |
| Physical characteristics | |
| Dimensions | 18.494±0.199[4] 18.996±0.118 km[5] 27.90 km (calculated)[3] |
| 3.92±0.01 h[6] | |
| 0.057 (assumed)[3] 0.1500±0.0264[5] 0.180±0.020[4] | |
| C[3] | |
| 11.5[1][3] · 11.3[5] | |
Orbit and classification
Ogilsbie orbits the Sun in the outer main-belt at a distance of 2.4–3.9 AU once every 5 years and 7 months (2,043 days). Its orbit has an eccentricity of 0.23 and an inclination of 26° with respect to the ecliptic.[1] The first used precovery was obtained at Palomar Observatory in 1990, extending the asteroid's observation arc by 3 years prior to its discovery. The first (unused) observation at Palomar dates back to 1953.[7]
Physical characteristics
In 2010, a photometric lightcurve analysis by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory (B88) in Mombercelli, Italy, rendered a well-defined rotation period of 3.92±0.01 hours with a brightness amplitude of 0.40 in magnitude (U=3).[6]
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Ogilsbie has a diameter of 18.5 and 19.0 kilometer based on an albedo of 0.15 and 0.18, respectively,[5][4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and hence calculates a larger diameter of 27.9 kilometers.[3]
Naming
This minor planet was named in memory of Brian K. Ogilsbie (1970–1997). School mate and good friend, he is well remembered by the discoverer for the long talks they had on their excursions.[2] The official naming citation was published by the Minor Planet Center on 27 April 2002 (M.P.C. 45336).[8]
