Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, 0C, Gain 200
Filter: 2” Radian Triad Ultra Hb, OIII, Ha, SII filter
Guide scope: Astro-Tech 60mm, Meade DSI Pro II, PHD
Exposure: 41x240sec, saved as FITS
Darks: 32x240s, saved as FITS
Flats: 32x1sec, sky flats taken at dusk
Average Light Pollution: Red zone, Bortle 8, fair transparency
Lensed Sky Quality Meter: 18.4-18.6 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop
This is NGC 7635 is almost the inverse of a planetary nebula. Planetaries are expanding shells of gas shed from a dying star. The Bubble is formed from the intense radiation a hot blue star pushing out a sphere in the surrounding gas, making an empty bubble and setting the hydrogen aglow with a beautiful red color. The Bubble looks like a beautiful and delicate Christmas ornament on an unimaginable scale.