The nucleus was split in 1994, and it was discovered because it became
bright in outburst.
Five components, A to E, were observed in 1994. Two of them, A and D,
returned in the next return in 1999. In the next return in 2005, only
the component A was observed due to the bad condition.
In 1999, the main component A became fainter than discovery by 3 mag.
The characteristic of the light curve changed. But in the next return
in 2005, it was observed as bright as in 1999. The characteristic of
the light curve was also similar, which is rapid along a 20 log r
formula and it becomes brightest 10 days after the perihelion passage.
In 1999, another fragment D also became fainter than discovery by 2-3
mag. It behaved unusually both in 1994 and 1999. In 1994, it
brightened after the perihelion passage and became brighter than the
main component. On the other hand, it started fading before the
perihelion passage in 1999.
Kazuo Kinoshita's calculation revealed that it will pass very close by
Earth in 2036, down to 0.12 A.U.