Positive X is toward the east. Rectangular Y coordinates in millimeters with origin at the plate center. Positive Y is toward the north. Units are in arc minutes. Minor axis measurements refer to the maximum extent of features which can be described as belonging to the object.
Units are in arc minutes.
The angle of the major axis of elongated galaxies is measured from north through east. The estimated Hubble class. Description Descriptions pertaining to the source. The descriptions are concise and most words have been abbreviated. A list of abbreviations can be found in Holmberg, Lauberts, Schuster, and West 1974.