42923 1999 SR18 is a main-belt asteroid with an estimated diameter of 5 km. It was discovered on September 30, 1999, by LINEAR at Socorro. The semi-major axis is 2.05 AU, the eccentricity is 0.185 and the inclination is 6.81 degrees.
Asteroid 42144 2001 BW40, was observed on 5 nights during May 2005. The resulting lightcurve indicated a period of 8.392 hours. The amplitude was quite large at bout 1.4 magnitude.