Sh2-92, nicknamed “The Scream” for the anguished face that emerges in narrowband renders — a faint, rarely imaged H II region in Vulpecula. It’s a genuinely big object: a cavity over 200 light-years across, roughly 14,000 light-years away, blown open and ionized by the Wolf-Rayet star WR 127. Six and a quarter hours of 3nm narrowband, processed with a Foraxx palette.
All renders are in the gallery folder, and the image is on AstroBin.
Acquisition details
- Total integration: 6h 15m — Hα 2h 5m (25 × 300″), SII 2h 5m (25 × 300″), OIII 2h 5m (25 × 300″)
Equipment
- Telescope: William Optics SpaceCat 61
- Camera: ZWO ASI2600MM Pro
- Mount: Sky-Watcher Wave 150i strain-wave mount
- Filters: Antlia 3nm Hα / OIII / SII, 36 mm
- Accessories: MeLE Quieter4 mini PC, Pegasus Astro FocusCube 3
- Software: N.I.N.A., PHD2, Green Swamp Server, PixInsight, Adobe Lightroom Classic