Barred Spiral in Pegasus



Optics/Mount: CPC1100 with f6.3 Celestron reducer on a Milburn Wedge. Dec antibacklash set to 27/27. PEC on.
Camera: SXVR-H694
Exposure: 36x3 mins lum, 10x3 minutes for each color channel, all bin 1x1.
Filters: Astronomik LRGB
Date: August and September 2012

Imaging automation and capture: Sequence Generator Pro

Guiding Hardware: Flea3, Taurus Tracker III off axis guider. Guiding scale 0.72 arcsec/pixel. 1 second guide exposures.
Guiding Software: PHD. Aggressiveness 80, Hysteresis 0, Minimum Move 0.9, Max RA 1000, Max Dec 600. Dec set to auto/resist switching. Dithering set to Extreme with Settle < 1.2.
Guiding performance: HFR of subs about 1.2 arc seconds, RMS in PHD about 0.5 arcsecs.
Light pollution: Bortle 8 (white zone, NELM about mag 4.5)
Image scale at capture: 0.6 arcsecs/pixel = f/5.7
Scale of presentation: 1.2 arcsecs/pixel
Processing: Bad pixel map in Nebulosity 2, stacked with Deep Sky Stacker, post-processed with Photoshop CS2.