2020 Michael A. Siniscalchi

SII
OIII
H-alpha
RGB Star field
Location & Date
Backyard, Abbott Observatory- Long Island, NY, August & September 2020
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader 5nm Ha SII OIII + RGB AR Filters
CCD temp -15C
Exposures
Ha-10x30m SII-10x20m OIII-10x20m RGB 9x5m Bin 1x1
Planning
Mosaic planning - Sequence Generator Pro
Image acquisition - Sequence Generator Pro w/PinPoint & PHD (guiding)
Processing
StarNet - star removal prior to stretching Ha SII OIII
ICE (Image Composite Editor) - image stitching
CCDStack - Calibration, Normalize, Alignment, Mean Combine, Deconvolution   
Adobe CS4 - Ha+SII OIII RGB combine, Sharpening, Noise reduction, JPEG conversion
Color mapping: Red= Ha+SII  Green=OIII  Blue=OIII + ~2% Ha
LBN 576 (Abell 85 / CTB 1)
Supernova Remnant in Cassiopeia
RA: 23h 59m 54s  Dec: +62 26', Distance: ~10,000 ly, Size: ~100 ly

  This is my first attempt at creating a mosaic image. The planning was done using Sequence Generator Pro's mosaic tool. I could have fit most of the object into a single frame but I wanted to display its surroundings to add to the overall view. This 2-panel mosaic was composed using a 20% overlap and stitched together using Microsoft ICE (Image Composite Editor) which did a great job blending the seams. This is one of the dimmest images I have ever captured and had to resort to 30 minute subs to capture enough Ha to see the filaments. This object is a good test for your imaging rigs ability to take very long 30 minute exposures while maintaining round stars.
  The strong SII emissions, that were easily seen with 20 minute sub exposures, was combined with Ha to create a synthetic luminance channel.
Shown below are the H-alpha, SII, OIII frames and an RGB composite star field.
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LBN576, also identified as Abell 85 and later CTB-1, is a faint supernova remnant (SNR) located in Cassiopeia.
It was first cataloged by George Abell as a planetary nebula and tagged as Abell 85, but later research has shown it to be a supernova remnant. Recent studies have identified this SNR as a radio source and was given the name of CTB-1. Another discovery has shown a pulsar was born from the supernova that was ejected and traveling at a velocity greater than 1000 km/s.

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