The Seagull Nebula (IC2177) is an emission nebula located between the constellations Monoceros and Canis Major. I captured a few hours each of one-shot color (OSC) and narrowband H-alpha data on this target in late March 2019. Will have work on a longer integration time in the future. For the OSC images, this was my first use of a IDAS LPS-D1 light pollution reduction clip filter for my Nikon D5300. My experience to date has been that LPS filters are a big help when I image targets in my Southern sky (looking directly towards a freeway and downtown DC).
Updated version (Rev. B):
Generated from original OSC RGB data and H-alpha NB data using the Pixinsight NBRGB combination script. Red was augmented by H-alpha data with a scale factor of 1.0. Details on Ha data at:
https://astrob.in/399873/0/Original version:
Imaged on March 23 & 27 , 2019 with WO GT81 at F4.7 (382 mm focal length) using Flat6A II field flattener/0.8x reducer, IDAS LPS D1 Clip Filter, and full spectrum modified Nikon D5300.
Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, bias, and flats. Stacked 31 subs (180 sec at ISO 200) for a total integration time of ~1.5 hours. Post-processed in Pixinsight: Cropped, gradient removal with ABE, Background Neutralization, Color Calibration, SCNR, stretched using Histogram Transformation Tool, Curves Transformation, ACDNR noise reduction, and Color Saturation.
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