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14 Dec 2009, 22:25 UTC
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This weekend, Earth passed through a stream of debris from 3200 Phaethon. In 1983 Whipple identified Phaethon like the parent of Geminid meteor stream. But it has never displayed unambiguous cometary activity.The Geminids provide the most impressive meteor display of any of the annual showers.Bill Cooke of NASA's Meteoroid Environment Office, prepared a plot showing how the shower has intensified since its discovery. Jupiter's gravity has been acting on Phaethon's debris stream, causing it to shift more and more toward Earth's orbit: Preliminary counts from the International Meteor Organization (IMO) shows that the Geminids meteors reached a ZHR(max) ~ 130/150 around 20/21 UT of Dec. 13, so roughly 8/9 hours before the predicted peak scheduled for around 5 UT of Dec. 14.Radio meteor observations all over the world seems to confirm that the peak arrived 4/5 hours early on the predictions: (Credit: RMO) According to IMO Meteor Shower Calendar "the Geminid peak has shown slight signs of variability in its rates and timing in recent years"Our meteorcam, located in Castellammare di Stabia (Italy), imaged 44 meteors (35 were Geminids) on 12/13 December, one day before the peak. Unfortunately clouds prevented us to follow the Geminids through the maximum rate.These are ...

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