Bright short periodic comet, however, it has been lost since
apparitions twice in 1975 and 1986.
The light curve is almost along the 40 log r formula. It brightens
rapidly just before the perihelion passage, and fades out rapidly soon
after the perihelion passage.
Because the perihelion distance is 1.1 A.U., it passes near by the
earth and becomes very bright if it passes the perihelion from autumn
to winter. On the other hand, it is extremely hard to observe due to
the bad condition if it passes the perihelion from spring to summer.
The condition was good in 1975 and 1986, but it was missed in 1997 due
to the bad condition. It will return in good condition again in 2008.
In 1986, it became brighter than at the discovery in 1975 by 2 mag.
In 2008, it has not been recovered yet in August. This implies the
comet can become much fainter than before, by 2 mag than at the
discovery, or by 4 mag than 1986.
Kazuo Kinoshita's calculation revealed that the orbit does not change
so much from early 20th century to mid 21st century.