Caldwell 21 (NGC 4449) - The Box Galaxy

by Roman Hujer

Objects in field: NGC 4449

Equipment: Celestron EdgeHD 9.25", ZWO ASI2600MC Pro, ZWO ASI2600MM Pro

Integration: 16h 30m

Caldwell 21 (NGC 4449) — Irregular Galaxy in Canes Venatici Telescope: Celestron EdgeHD 9.25” at F/10 Date: February 27, 2026 Camera (OSC): ZWO ASI2600MC Pro — 90 × 120 s L Camera (Mono): ZWO ASI2600MM Pro — 90 × 180 s L Date: March 10, 2026 Camera (OSC): ZWO ASI2600MC Pro — 30 × 180 s C1 (Dual-band Ha&Oiii) and 40 × 120 s L Camera (Mono): ZWO ASI2600MM Pro — 140 × 120 s L and 30 × 180 s Ha…