The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.
The perihelion date in the next return is calculated by Kazuo Kinoshita (http://www9.ocn.ne.jp/~comet/pcmtn/0122p.htm).
The perihelion dates in 1922 are printed on IAUC 6235.
Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.