Telescope: Meade SN10 at f/4, Orion Atlas EQ-G
Camera: QHY 268c, Mode 0, Gain 30, Offset 30, -10C
Filter: 2” Radian Triad Ultra Hb, OIII, Ha, SII filter
Guide scope: Williams Optics 50mm, ASI290MM mini, PHD
Exposure: 16x300sec, saved as RAW16/FITS
Darks: 32×300 sec
Flats: 64×2 sec, tee shirt flats taken at dusk
Average Light Pollution: Red zone, fair transparency, moonlight
Lensed Sky Quality Meter: 18.4 mag/arc-sec^2
Stacking: Mean with a 1-sigma clip.
White Balance: Nebulosity Automatic
Software: SharpCap Pro, Nebulosity, Deep Sky Stacker, Photoshop
This is NGC 7635, the Bubble Nebula in Cassiopeia, with just a bit of the open cluster M52 in the upper left corner. The Bubble is almost the inverse of a planetary nebula; rather than an expanding shell of gas shed from a dying star, the Bubble is formed from the intense radiation of 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.
NGC 7635 is currently high in the southeast at dusk.
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