The Spider Nebula (IC417) & the Fly Nebula (NGC 1931) are located in the constellation of Auriga IC417.
The Spider is an emission nebula located approximately 2705 light years from Earth.
The Fly is an located approximately 8155 light years from Earth.
Data captured over 7 nights between 2nd Janusary & 14th February, 2021.
Imaged as a 2x1 Mosaic.
71x 10 minute exposures with Hydrogen-Apha filter.
71x 2 minute exposures with Blue filter (Binned 2x2).
71x 2 minute exposures with Green filter (Binned 2x2).
71x 2 minute exposures with Red filter (Binned 2x2).
Total Exposure = 18.9 hours.
Skywatcher Quattro 200 CF
Atik 460EX Mono
This image was processed in Pixinsight & Lightroom.
Calibration and Stacking in Pixinsight using Batch PreProcessing.
Dynamic Crop - To remove black edges & integration artifacts. (Each Channel)
Automatic Background Extraction - To remove gradients. (Each Channel)
Channel Combination - To combine RGB channels.
Photometric Colour Calibration - To calibrate colours. (RGB Image)
SCNR - To remove green cast. (RGB Image)
Deconvolution - To bring out some fine detail & tighten stars, 50 iterations. (Ha only)
Multiscale Linear Transform - Noise reduction. (Ha only)
Linear Fit - To equalise each of the RGB channels.
Histogram Transformation - To stretch the Ha & RGB. (Using statistics process to keep background levels even)
LRGB Combination - To blend Ha & RGB, creating the HaRGB image.
Histogram Transformation - To clip blacks slightly.
Curves Transformation - To boost nebula saturation, with inverted nebula mask in place.
Histogram Transformation - To clip blacks, with inverted nebula mask in place.
UnsharpMask - To sharpen nebula detail, with inverted nebula mask in place.
Local Histogram Equalisation - To sharpen nebula detail, with inverted nebula mask in place.
Dark Structure Enhance - To boost contrast.
Export as JPEG and import into Lightroom.
Increase Exposure (+0.25)
Increase Contrast (+15)
Boost Red Saturation (+50)
Reduce Purple Saturation (-75)
Luminance NR (+25)
Export final JPEG for upload.