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Sodium Brightening of (3200) Phaethon near Perihelion

Zhang, Qicheng; Knight, Matthew M.; Battams, Karl +2 more

Sunskirting asteroid (3200) Phaethon has been repeatedly observed in Solar Terrestrial Relations Observatory (STEREO) Heliospheric Imager 1 (HI1) imagery to anomalously brighten and produce an antisunward tail for a few days near each perihelion passage, phenomena previously attributed to the ejection of micron-sized dust grains. Color imaging by …