Predictions can change
Comets can brighten or fade unexpectedly, so Celest combines current relevance with practical planning estimates.
Changing visitors to the inner Solar System
Comets
Follow currently relevant comets, their brightest periods, close approaches, and realistic equipment needs.
Most comets need optical help
A close approach does not automatically make a comet visible to the naked eye; check magnitude and equipment first.
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Loading comet ephemeridesCurrently relevant objects
Comets worth following
Finding relevant comets
Checking brightness, elongation, altitude, and current observations…