Don,
Do you have any knowledge of asteroid 1991VG? Here is a fascinating(albeit somewhat dry and academic) article about it.
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1995Obs...115...78S&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
If this is right then...