4209 Briggs
| Discovery [1] | |
|---|---|
| Discovered by | E. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 4 October 1986 |
| Designations | |
| MPC designation | 4209 Briggs |
|
Named after
|
Geoffrey A. Briggs (space physicist)[2] |
| 1986 TG4 · 1969 SB 1978 EL8 · 1986 WD5 1989 CO4 |
|
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 46.22 yr (16,882 days) |
| Aphelion | 3.4226 AU |
| Perihelion | 2.8868 AU |
| 3.1547 AU | |
| Eccentricity | 0.0849 |
| 5.60 yr (2,047 days) | |
| 54.873° | |
| Inclination | 21.624° |
| 330.37° | |
| 12.632° | |
| Physical characteristics | |
| Dimensions | 25.63±2.3 km (IRAS:2)[4] 28.92±0.71 km[5] 30.895±0.239 km[6] 29.62±0.61 km[7] 25.39 km (derived)[3] |
| 12.22±0.02 h[8] 12.235±0.01 h[9] 12.2530±0.0005 h[10] |
|
| 0.1288±0.026 (IRAS:2)[4] 0.103±0.006[5] 0.0889±0.0256[6] 0.067±0.013[7] 0.0827 (derived)[3] |
|
| C [3] | |
| 11.3[1] | |
4209 Briggs, provisional designation 1986 TG4, is a carbonaceous asteroid from the outer region of the asteroid belt, about 26 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin at the U.S. Palomar Observatory, California, on 4 October 1986.[11]
The C-type asteroid orbits the Sun at a distance of 2.9–3.4 AU once every 5 years and 7 months (2,047 days). Its orbit shows an eccentricity of 0.08 and is tilted by 22 degrees to the plane of the ecliptic. It has a well-defined rotation period of 12.25 hours[10] and an albedo between 0.07 and 0.13, according to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the U.S. Wide-field Infrared Survey Explorer with its NEOWISE mission.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.08, indicating that the older and fewer observations by IRAS and Akari have given a too high albedo for the surface of a carbonaceous body.[3]
The minor planet was named in honor of American space physicist, Geoffrey A. Briggs, director of the Solar System Exploration Division at NASA Headquarters during the 1980s. He played a leading role in establishing the U.S.–Soviet Joint Working Group for Solar System Exploration and served as co-chairman. He led the Mars imaging teams for the Mariner and Viking missions from 1969 to 1977. Briggs continued to promote Space related accomplishments to the public at the Air and Space Museum.[2]
References
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External links
- Encyclopedia Astronautica – Briggs, Geoffrey A
- Asteroid Lightcurve Database (LCDB), query form (info)
- 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
- 4209 Briggs at the JPL Small-Body Database
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