Newly discovered approaching comet C/2023 P1, or Nishimura, had its tail blown away by a coronal mass ejection on September 2.
"Comets and planets both orbit the sun, but unlike the circular orbits of planets, comets follow highly elliptical orbits.""This leaves it with lots of loose particles, both charged and neutral, that come away from it while it is moving," Ian Whittaker, a senior physics lecturer in physics at Nottingham Trent University in the U.K.
"The charged particles will do the same unless there are any electric or magnetic fields nearby," Whittaker said."The sun itself has a magnetic dipole and has a magnetic field flowing out into the solar system. So the charged particles coming off of the comet are picked up by this magnetic field and sent directly away from the sun .
The CME that hit the comet this week was likely emitted from active sunspot AR3413, which is facing toward the comet. The comet's tail has already grown back, but may be knocked off again as it faces more CMEs in coming weeks.
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