NGC 6888 — Crescent Nebula
The Crescent Nebula in Cygnus, about 5,000 light-years away — a shell of gas thrown off by the Wolf-Rayet star WR 136 and now being slammed from behind by the star's own faster wind. The collision lights up the delicate blue-green OIII envelope that wraps the whole crescent like a soap bubble, floating over a field of red hydrogen. Twelve nights through the Askar 107PHQ from August to October 2025: nearly thirty-four hours of narrowband, with short RGB runs for natural star colour.
- Coordinates: RA 20h 12m 07s, Dec +38° 21′ 18″ (Cygnus)
- Optics: Askar 107PHQ (749 mm, f/6.9)
- Camera: ZWO ASI2600MM Duo
- Mount: Sky-Watcher Wave 150i
- Filters: Hα / OIII / SII narrowband, 2 in; R / G / B
- Integration: 36h 50m — Hα 11h 10m (134 × 300″), OIII 13h 05m (157 × 300″), SII 9h 25m (113 × 300″), R 1h 05m (129 × 30″), G 1h 02m (124 × 30″), B 1h 03m (126 × 30″)
- Captured: 2025-08-06 to 2025-10-07, 12 nights