The small (~30 metre) asteroid 2006 HX57 which was discovered by LINEAR on 30 April is calculated to pass the Earth by about 3.0 lunar distances on May 6th, 2006.
At magnitude 16 it is beyond the range of most amateur scopes.
e = 0.497174991343023 i = 0.182154960536887 deg q = 0.914964789988335 AU w = 147.480159599792 deg a = 1.81964853425283 AU node = 123.392942658243 deg Q = 2.72433228 AU M = 321.312260848049 deg P = 2.4546 y n = 0.401534 deg/d