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The fireball may have been a piece of periodic Comet 2P/Encke. Right now, Earth is passing through a stream of debris from the comet, and this is causing the annual Taurid meteor shower, which peaks between Nov. 5th and 12th. The display usually produces no more than about 5 meteors per hour, but what it lacks in number, it makes up for in dazzle. Taurids tend to be fireballs, bright enough to be seen even in twilight skies. At the time of the Bay Area fireball, the constellation Taurus was rising in the east, so the fireball's identification as a Taurid seems probable, albeit not certain.