Comet 17P/Holmes is showing impressive activity. The comet should have been at magnitude +16,8; but it is currently at naked eye visibility.
Earlier yesterday, observers noted an abrupt increase in brightness of the comet, with it rising suddenly to magnitude +7, and a few hours later becoming visible to the naked eye with a magnitude estimated at +4. 0.
Seiichi Yoshida, a Japanese observer announce at 13:40 UT that the comet was visible to the naked eye from downtown Yokohama with a magnitude that he estimate at +3.5.
At 15:30 UT, Yoshida announced that the comet was at magnitude +3 and should reach magnitude +2 in the next hour.
The comet is located in the constellation of Perseus, just beside Lambda Persei.
