Science ❯ Astronomy ❯ Orbital Mechanics

Comet Orbits

Long-period Comets Perihelion Long-term Visibility Close Approaches 170,000 Year Orbit Long Period Comets Orbital Periods 1,350-Year Orbit C/2025 A6 (Lemmon) Lemon Comet Orbit Retrograde Motion 3I/ATLAS Orbit

Rare Comet Pan‑STARRS Now Glows Before Dawn for a Short Northern Viewing Window

The window closes around April 19 perihelion, leaving the comet out of view for Northern Hemisphere skywatchers.

Twin Green Comets Brighten For Best Views Under Next Week’s New Moon