NGC 7635
The Bubble Nebula

NGC 7635
The Bubble Nebula

NGC: 7635

Date: August 2009
Telescope: Meade 16" Schmidt Cassegrain with f6.3 reducer
Camera: SBIG ST-10XE
Guiding: Meade 5" refractor/DSI Pro/PHD
Filters: AstroDon 6nm narrow band

Exposure: L=20x30s

Processing Notes: Images were captured in CCDSoft. Reduced and aligned in SSDStack. Combined in Sigma Beta. Imported to Photoshop with an arcsine stretch. The three colors were individually stretched using curves so that their histograms were similar. Dark areas blurred at bit, bright areas sharpened. A minimum filter was applied to the stars - slightly more for [SII] and [OIII] so they would match the H-alpha data. The individual channels were combined into a 3-color image. 20x30seconds of Luminance was layered with the 3-color image. After flattening the image, the color balance was tweaked in Photoshop.

Additional Comments: This is the first image taken at the FLC observatory with 10 minute subframes. Between frame set, the tracking was getting better as the balance was improved. Right after taking these subs, the secondary mirror was tightened, which improved the collimation and (I hope will) additionally improve the tracking.

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