Task: Text Simplification
Input (English): david w. dunham , the minor planet bulletin , volume 6 , p.13-14 -lrb- december 1978 -rrb- ads archive copy however , careful examination in 1993 , using the hubble space telescope , failed to locate a secondary.
Output (English): david w. dunham , " the minor planet bulletin , volume 6 , page 13-14 , december 1978 , -rrb- " ads archive copy . nonetheless , a thorough study with the hubble space telescope in 1993 did not spot another one.