In early June 2013 we may witness the return of the gamma Delphinids,
a rather elusive meteor shower. Three observers from American Meteor
Society noticed a short-lived meteor outburst from unknown source on
June 11, 1930. Only a few meteors from this shower are thought to have
been observed, originated from the gamma Delphinids, but those
identifications remained delicate. Recent estimates by experts suggest
that 2013 and 2027 might be the best years for a repeat performance.
A fresh return of gamma Delphinids might take place on June 11, 2013 around 08:28 UTC. With a slim waxing crescent Moon, viewing conditions will be perfect for seeing whether any activity happens or not. As of this time no zenithal hourly rate (ZHR - the number of meteors a single observer would see in one hour under a clear, dark sky if the radiant of the shower were at zenith) estimate had been proposed for the event, nor any indication of the possible particle sizes or meteor brightnesses that could be involved. The gamma Delphinids are rather fast for meteors moving at a speed of 57 km/s, or 127,500 mph.
If anything happens as predicted from this radiant area, it would be best-seen from sites across North America.