Asteroid Close Approaches is a free calendar you can subscribe to on Nundina, with 136 dates listed. Data from NASA JPL Center for Near-Earth Object Studies. Subscribe to it on Nundina and every date lands in your own calendar, updated automatically.
Asteroids passing within 0.05 AU of Earth over the next two months, from NASA JPL: how near each one comes, how fast it is travelling and how big it is, with the potentially hazardous ones flagged.
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