We report on UBV observations of the rise from the low to the high state of activity of this object which occurred in August 1997. B-V index becomes progressively bluer as the system brightnes during the transition while U-B does not exhibit any noticeable trend.
We report on UBV observations of the rise from the low to the high state of activity of this object which occurred in August 1997. B-V index becomes progressively bluer as the system brightnes during the transition while U-B does not exhibit any noticeable trend. (en)