9826 Ehrenfreund
| Discovery | |
|---|---|
| Discovered by |
C. J. van Houten I. van Houten T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 16 October 1977 |
| Designations | |
| MPC designation | 9826 Ehrenfreund |
|
Named after
|
Pascale Ehrenfreund (astrophysicist) |
| 2114 T-3 · 1993 VH2 | |
| main-belt · Eos | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.64 yr (14,113 days) |
| Aphelion | 3.2584 AU |
| Perihelion | 2.7325 AU |
| 2.9954 AU | |
| Eccentricity | 0.0878 |
| 5.18 yr (1,894 days) | |
| 258.13° | |
| 0° 11m 24.36s / day | |
| Inclination | 8.9507° |
| 215.57° | |
| 112.17° | |
| Physical characteristics | |
| Dimensions | 6.94 km (calculated) 8.378±0.267 km |
| 3.7484±0.0013 h | |
| 0.14 (assumed) 0.191±0.024 |
|
| S | |
| 12.8 13.096±0.002 (R) 13.1 13.38±0.26 13.55 |
|
9826 Ehrenfreund, provisional designation 2114 T-3, is a stony asteroid from the outer region of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 October 1977, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the U.S. Palomar Observatory in California.
The S-type asteroid is a member of the Eos family, an orbital group of more than 4,000 asteroids, which are well known for mostly being of stony composition. It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 2 months (1,894 days). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic. The first used observation was taken at the discovering observatory on 7 October 1977, extending the asteroid's observation arc by just 9 days prior to its discovery.
A rotational light-curve for this asteroid was obtained from photometric observations taken at the U.S. Palomar Transient Factory in August 2013. It gave a rotation period of 3.7484±0.0013 hours with a brightness variation of 0.37 in magnitude (U=2).
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