|Discovered by||K. Korlevi?|
|Discovery site||Vi?njan Obs.|
|Discovery date||14 March 1999|
|MPC designation||(10645) Bra?|
|Bra? (Croatian island)|
| · 1962 TN|
1968 BF ·
1980 YK ·
|main-belt · Eunomia |
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 0|
|Observation arc||54.67 yr (19,968 days)|
|4.33 yr (1,583 days)|
|0° 13m 39s / day|
|Dimensions||9.60 km (calculated)|
|S  · LS |
|12.5 · 12.4 · 12.3 · |
10645 Bra?, provisional designation , is a stony Eunomia asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 14 March 1999, by Croatian astronomer Korado Korlevi? at Vi?njan Observatory, and named after the Croatian island of Bra?.
The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2-3.1 AU once every 4 years and 4 months (1,583 days). Its orbit has an eccentricity of 0.18 and an inclination of 13° with respect to the ecliptic. The first precovery was taken at the U.S. Goethe Link Observatory in 1962, extending the asteroid's observation arc by 37 years prior to discovery.
In October 2014, photometric observations by Italian astronomer Silvano Casulli gave a rotational lightcurve with a period of hours and a brightness amplitude of 0.31 in magnitude (U=3-). Three weeks later, a second lightcurve was obtained at the U.S. Etscorn Campus Observatory in New Mexico, rendering a concurring period of with an identical variation in brightness (U=3-).
According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 10.3 kilometers in diameter and its surface has an albedo of , while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 and calculates a diameter of 9.6 kilometers. A large-scale survey by Pan-STARRS (PS1) assigns an LS-type, an intermediary spectral type between the common, stony S-types and the rather rare and reddish L-type asteroids.
This minor planet was named after the Croatian island of Bra?, the largest Dalmatian island in the Adriatic sea, and the place where the Blaca hermitage Observatory is located. The approved naming citation was published by the Minor Planet Center on 15 December 2005 (M.P.C. 55720).