- Exposure time: 5 hours (30 min.
sub-exposures)
- Lens/telescope: INTES 150 mm (6")
MK-69 at f/6
- Image scale: 1.24 arcseconds per
pixel, FOV 68.5' x 51.6' (F = 900 mm at 5.4 micron pixels)
- Camera: SBIG ST-8300M (T: -18 degrees
Celsius) with Baader
H-alpha 7 nm narrowband filter
- Mount: Astro-Physics Mach1 GTO
(guide rate: 1x, PEM activated)
- Guiding: TS OAG + SX
Lodestar +
PHD
- SQM: - (not measured)
- Location: Zoetermeer, The
Netherlands
- Date: October 1 - 2, 2011
Workflow
Image acquisition:
- Capturing 10 light frames of 1800s
Pre-processing
in
Nebulosity
(v2.3.5):
- Pre-processing the light frames
with
a master bias frame (from
library) in Nebulosity
- Subtracting
the
bad
pixels
from
the
pre-processed
light
frames
with
a
bad
pixel
map
(from
library)
- Aligning (registering) the
pre-processed, bad pixels subtracted light frames and saving
each individual file
- Stacking the individually saved
registered files applying a 1.25 Standard Deviation Filter (sigma
stacking)
- Trimming the dark edges by making
a crop
- Applying the "Digital Development
Processing (DDP)" tool
Post-processing
in
Photoshop
(CS4):
- Iteratively
adjusting levels and curves in
order to get a smooth and proper histogram
- Further adjusting curves and
inverting the image to show as much as possible of the supernova remnant
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