Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G
Camera: QHY 367c Pro, 0C, Baader Mk III MPCC
Filter: GSO IR Blocking Filter
Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2
Exposure: 33x300sec, gain 2800, offset 50, saved as FITS, dithered every 2 images
Darks: 32, 0C, gain 2800, offset 50, saved as FITS
Flats: 64x500ms, Tee shirt flats taken at dusk
Average Light Pollution: Red zone, Bortle 8, fair transparency
Lensed Sky Quality Meter: 18.6
Stacking: Average, 1 sigma clip
White Balance: Nebulosity Automatic
Software: SharpCap Pro, Deep Sky Stacker, Nebulosity, 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 spherical void in the surrounding gas and setting the hydrogen aglow with a beautiful red color. The Bubble looks like a delicate Christmas ornament on an unimaginable scale.
NGC 7635 rises in the northeast in the early evening and is high overhead at dawn.
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