Cross-identifications are given to stars in the HD Catalogue (Cannon & Pickering 1918-24, with numbers in the range 1-225300), and its two extensions: HDE numbers in the range 225301-272150 (Cannon 1925-36) and 272151-359083 (Cannon & Walton Mayall 1949) respectively.
[]As for the DM identification numbers, reliability tests were
performed to check that the HD numbers increased with increasing right
ascension at the epoch of the catalogue (1900). Resulting corrections
have been included in the Hipparcos Input Catalogue. The format is
NNNNNN.