The comet will be visible till June 24 in the moon-free sky but it will not be possible to see it after June 26, as it will be very close to the sun.
The comet is named after the Australian astronomer who first observed it in September 2009. It occurs in such a bright state only once in every four years. The reason is that as the comet comes close to the sun, the melting of ice releases a trail of gas and dust. Comet Photo by Bob King