Asteroid positions are supplied from the Lowell Observatory AstEph. The sky map viewer is Aladin Lite, an embeddable tool provided by the Centre de Données astronomiques de Strasbourg. The viewer uses publically available Hierarchical Progressive Surveys via an aggregated list
astorb.dat.gzhave permanently moved to https://ftp.lowell.edu/pub/elgb/astorb.dat and https://ftp.lowell.edu/pub/elgb/astorb.dat.gz, respectively. FTP access is no longer supported.