The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.
The perihelion dates in the past appearances are calculated using the Minor Planet & Comet Ephemeris Service.
The appearance in 1949 is published on M.P.E.C. 2024-Q42.
Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.