They orbit each other with a period of NUMBER@1 hours , which roughly indicates that the binary is very close -- the separation being of the order of NUMBER@2 -- NUMBER@3 km , if typical asteroid albedo and density values are assumed .

It takes NUMBER@1 hours to orbit each other , which says that the binary is very close -- the separation being of the order of NUMBER@4 km , if normal asteroid albedo and density values are assumed .
