Science ❯ Astronomy

Comet Characteristics

Composition Brightness Orbit Oort Cloud Physical Properties Orbital Mechanics Trajectory Nucleus and Tails Orbital Periods Orbital Period

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.

Russia’s 2026 Sky Guide: Two Visible Eclipses and Two Early‑Year Comets

NASA Unveils Multi‑Mission Views of Interstellar Comet 3I/ATLAS

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

First Post-Perihelion Images Capture 3I/ATLAS After Sun Passage

Comet Lemmon Enters Peak Visibility After Close Pass to Earth

Two Long-Period Comets Enter Peak Viewing: SWAN Closest Now, Lemmon Tuesday

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

Two Comets Share the Night Sky This Weekend as Swan Peaks, Lemmon Nears Earth

Swan and Lemmon Comets Near Earth Next Week as Interstellar 3I/ATLAS Stays Out of Sight

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

SWAN Nears Oct. 20 as Lemmon Follows, ATLAS Reaches Perihelion

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

Interstellar 3I/ATLAS and Newcomer C/2025 K1 Head Toward October Perihelions

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

Comet C/2025 F2 (SWAN) Illuminates Pre-Dawn Skies Ahead of Solar Encounter

Rare Sun-Skirting Comet Visible in Southern Hemisphere Skies This Week

Rare Comet C/2024 G3 Expected to Shine as Bright as Venus

Halloween Comet C/2024 S1 Faces Disintegration as It Nears the Sun

Comet Tsuchinshan-ATLAS and Halloween Comet ATLAS Light Up October Skies