NASA's Solar Terrestrial Relations Observatory (STEREO) tagged posts

Asteroid’s Comet-like Tail Is Not made of Dust, solar observatories reveal

The Large Angle and Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) imaged asteroid Phaethon through different filters as the asteroid passed near the Sun in May 2022. On the left, the sodium-sensitive orange filter shows the asteroid with a surrounding cloud and small tail, suggesting that sodium atoms from the asteroid’s surface are glowing in response to sunlight. On the right, the dust-sensitive blue filter shows no sign of Phaethon, indicating that the asteroid is not producing any detectable dust.
Credits: ESA/NASA/Qicheng Zhang

A weird asteroid has just gotten a little weirder.

We have known for a while that asteroid 3200 Phaethon acts like a comet...

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