http://adsabs.harvard.edu/abs/1990ndpd.conf..273T
http://adsabs.harvard.edu/abs/1989IAUC.4714....1H
Orbital Data:
http://www9.ocn.ne.jp/~comet/pcmtn/0111p.htm
Observations:
http://www.oaa.gr.jp/~oaacs/nk/nk797.htm