Outbursts occur frequently. The light curve is unpredictable in every
apparition. Especially, a major outburst of about 10 mag happened in
1973 and the comet has reached to 4 mag.
Even if no major outburst occurs, it seems to have a trend of rapid
brightening and fading around the perihelion passage.
Kazuo Kinoshita's calculation revealed that it will approach to the
Earth down to only 0.1484 A.U. on 2017 Apr. 5. It will be observable
in excellent condition and reach to 5.5 mag. The approach is only 8
days prior to the perihelion passage. Therefore it is highly expected
that an outburst occurs and the comet will be a naked eye object.