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Geminid Meteor Shower This Month

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Starting roughly, oh… now, but peaking the night of Dec. 13-14 is the Geminid meteor shower. You know, the Geminids- fragments of, not a comet, but asteroid (3200) Phaethon?

This asteroidal shower has an interesting origin story- or would that be stories? The IRAS mission (InfraRed Astronomy Satellite), in 1984, spotted trails of dust crossing the inner Solar System. It was easy enough to deduce that these trails are the solid debris left behind by comets. However, one such trail was found to match the Geminid meteor shower, as it crossed Earth, and aligned with the orbit of (3200) Phaethon- the asteroid was somehow connected to the meteors!

(Granted, there’s a bit of leeway. It’s possible that Phaethon is not literally the parent of the meteors; instead, there may be a larger body, now lost. This long-gone parent may have split into both Phaethon, the Geminid swarm, and lesser asteroids.)

Seeing the shower is simple. Find a nice, dark spot, face the constellation Gemini (generally South, if you’re in the Northern Hemisphere- but Gemini is pretty high in any case), and get comfortable. The radiant- apparent ”source”, from our point of view- is in Gemini. This year’s shower is predicted to be above average; Earth is crossing a major stream of Phaeton activity, and skies should be favorable- the Large Achondrite (Earth’s natural satellite) will be a low crescent.

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