PK 238 +34.1 Planetary Nebula in Hydra
Optics/Mount: CPC1100 with f6.3 Celestron reducer on a Milburn Wedge. Dec antibacklash set to 27/27. PEC on.
Exposure: 17h 20m total, 35 x 20 minutes OIII bin 1x1, 68 x 5 minutes Ha bin 2x2
Filters: Astrodon 5nm Ha and 3nm OIII
Date: 6 nights from February 2 – March 10, 2013
Imaging automation and capture: Sequence Generator Pro
Guiding Hardware: Flea 3, 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
Focusing: Rigel Systems GCUSB/nStep on stock C11 focuser
Light pollution: Bortle 8 (white zone, NELM about mag 4.5)
Image scale at capture: 0.6 (OIII bin 1x1) and 1.2 (Ha bin 2x2) 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.