Science ❯ Astronomy ❯ Astrophysics

Comet Characteristics

3I/ATLAS Trajectory Mass and Size Measurements Nucleus Size Brightness Dust Plumes Trajectory and Origin Tail Formation Hyperbolic Trajectory Perihelion

Comet Pan‑STARRS Brightens to About Magnitude 4.5 in the Pre‑Dawn Sky

A brief pre‑dawn window favors Northern Hemisphere observers with clear eastern horizons.

Comet SWAN25F Brightens Rapidly as It Approaches the Sun

Ancient Comet Makes Rare Return, Visible in October Skies