The asteroid Phaethon's tail is not made of dust after all, scientists have discovered.
Phaethon made its close approach
Asteroid Phaethon seen through different filters by the SOHO sun observatory. Left: A view of Phaethon through sodium-sensitive orange filters, with its cloud and small tail. Right: A view of Phaethon with a blue dust filter shows no sign of a dust tail. "Our unique observing plan found the mysterious asteroid Phaethon for the first time in SOHO data," Zhang."The distinctive filters of the 27-year-old LASCO camera were used in a special interruption to the regular observing schedule to uncover these hidden secrets."
Though the sodium outflow detected isn’t powerful enough to lift dust particles, this discovery suggests an unobserved and unknown disruption of Phaethon, perhaps as long as two thousand years ago, could have created the debris that causes the Geminids.
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