3309 Brorfelde
| Discovery | |
|---|---|
| Discovered by |
K. Jensen K. Augustesen |
| Discovery site | Brorfelde Obs. |
| Discovery date | 28 January 1982 |
| Designations | |
| MPC designation | 3309 Brorfelde |
|
Named after
|
Brorfelde Observatory (discovering observatory) |
| 1982 BH | |
| main-belt · Hungaria | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.30 yr (12,529 days) |
| Aphelion | 1.9143 AU |
| Perihelion | 1.7207 AU |
| 1.8175 AU | |
| Eccentricity | 0.0533 |
| 2.45 yr (895 days) | |
| 356.01° | |
| 0° 24m 7.92s / day | |
| Inclination | 21.136° |
| 29.797° | |
| 218.36° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions |
3.78±0.60 km 3.91 km (derived) 5.038±0.083 km |
|
2.503±0.001 h 2.5041±0.0002 h 2.5042±0.0001 h 2.5046±0.0003 h 6±2 h 8±1 h 9.3788±0.0022 h |
|
|
0.253±0.060 0.2747 (derived) 0.408±0.060 0.46±0.24 |
|
| SMASS = S · S | |
| 13.4±0.2 (R) · 13.584±0.001 (R) · 13.60 · 13.7 · 13.9 · 13.97±0.09 · 14.062±0.064 | |
3309 Brorfelde, provisional designation 1982 BH, is a nearly spheroidal, binary Hungaria asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 28 January 1982, by Danish astronomers Kåre Jensen and Karl Augustesen at Brorfelde Observatory near Holbæk, Denmark. It was named for the discovering observatory and the village where it is located.
Brorfelde is a bright stony asteroid and member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.7–1.9 AU once every 2 years and 5 months (895 days). Its orbit has an eccentricity of 0.05 and an inclination of 21° with respect to the ecliptic. The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.
Between 2005 and 2010, astronomers Brian Warner and Petr Pravec obtained a large number of rotational light-curves of Brorfelde. Best rated light-curve analysis gave a rotation period between 2.5041 and 2.5046 hours with a brightness amplitude between 0.09 and 0.13 in magnitude, indicating that the body has a nearly sphereoidal shape (U=3/3/3). These results superseded photometric observations taken by Wiesław Z. Wiśniewski in the 1990s (U=2), and by Federico Manzini and René Roy in 2005 and 2009, respectively (U=2-/n.a.), as well as observations taken at the Palomar Transient Factory in 2010, which gave an incorrect period solution of more than 9 hours (U=1).
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