Comet C/2025 A6 (Lemmon)

Comet C/2025 A6 (Lemmon), the standout comet of late 2025. Discovered in January 2025 by the Mount Lemmon Survey, it brightened far beyond predictions and became a naked-eye object in the October evening sky. This RGB capture is from October 20, 2025 — right around its closest approach to Earth — with the ion tail streaming away from the coma. No fixed coordinates for this one: it was moving fast enough between frames that the stars and comet have to be stacked separately.

All renders are in the gallery folder, and the image is on AstroBin.

Equipment

• Telescope: William Optics SpaceCat 61
• Camera: ZWO ASI2600MM Pro
• Mount: Sky-Watcher Wave 150i strain-wave mount
• Filters: Baader R/G/B (CCD), 36 mm
• Accessories: MeLE Quieter4 mini PC, Pegasus Astro FocusCube 3
• Software: N.I.N.A., PHD2, Green Swamp Server, PixInsight, Adobe Lightroom Classic