Science ❯ Astronomy

Comet Characteristics

Composition Brightness Orbit Trajectory Physical Properties Orbital Mechanics Oort Cloud Nucleus and Tails Brightness Predictions Orbital Period Orbital Periods Long-Period Comets Mass Estimation Coma and Tail Hyperbolic Orbits Nucleus and Coma Magnitude Frozen Bodies Forward Scattering Proximity to Earth Gas Composition Color Color Change Outgassing Speed Comet Tails Coma and Tails Vaporization Speed and Trajectory Dust Trails Naked Eye Visibility Luminosity Comet Composition Brightness Changes Orbits Perihelion Dynamics of Comets Nucleus Composition Tail Length Gas and Dust 3I/ATLAS Trajectory Analysis Visibility Factors Velocity Chemical Composition Gas Coma

Brightening Comet Pan‑STARRS Enters Pre‑Dawn View for Northern Skywatchers

A small angle from the Sun will soon hide it in twilight, making this week the best viewing window.

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

Radio Detection From 3I/ATLAS Bolsters Natural-Comet Explanation

Comet Lemmon Makes Closest Approach Oct. 20–21 With Prime Viewing Under New Moon

Comets Lemmon and SWAN Poised for Best Viewing Oct. 20–21

Interstellar Comet 3I/ATLAS Slips Behind the Sun as New Study Finds Unusual Polarization

Global Telescopes Capture Active Coma of Interstellar Comet 3I/ATLAS