The Eastern Veil Nebula in Cygnus
The best known supernova remnant, high in the summer Milky Way. This is a tricolor narrowband in straight Hubble palette, SII:Ha:OIII mapped to R:G:B.
Optics/Mount: CPC1100 with f6.3 Celestron reducer on a Milburn wedge. Dec antibacklash set to 27/27. PEC on.
Camera: SXVR-H694
Exposure: Total exposure time about 34 hours; 36 x 20 mins SII, 56 x 20 mins Ha, 20 x 20 mins OIII. All bin 1x1.
Filters: Astrodon 5nm Ha and SII, 3nm OIII
Date: Data was collected over 16 nights from May 25-26 to August 6-7 2016.
Imaging automation and capture: Sequence Generator Pro
Guiding Hardware: ASI120MM, Celestron off axis guider. Guiding scale 0.46 arcsec/pixel. 1 second guide exposures.
Focusing: Rigel Systems GCUSB/nStep on stock C11 focuser
Guiding Software: PHD2. RA aggressiveness 55, hysteresis 0, Minimum Move 1.4 arcsecs, Max RA 200, Max Dec 600. Guiding unbinned with ZWO connection. Dec set to hysteresis. Dithering set to Extreme with Settle < 1.2.
Guiding performance: Average, FWHM of about 2.3 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 (50% reduction)
Processing: Bias, darks, and flats. Stacked and processed with PixInsight, with a few minor modifications in Photoshop.
