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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.
No one knows the strength of this display or whether it will occur at all. It would most likely be of short duration (less than one hour and perhaps as short as 15 minutes). This is not something one can stand outside and try to witness. Serious observers should be comfortable in a lounge chair and watch for at least an hour. I would not expect strong rates such that occurred with the Leonid outbursts near 2000. Rather these meteors are more likely to appear a minute or two apart. True Gamma Delphinid meteors would be moderately swift unless they appear near the radiant or near the horizon. In these case they would appear to travel with medium velocity. Unlike the 1930 display, the moon will not be a factor in 2013 as it will have set long before the predicted time of the outburst.