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Technical card

Imaging telescope or lens: Esprit 100/550

Imaging camera: SBIG STL-11000

Mount: Skywatcher AZ EQ6 GT

Guiding telescope or lens: TS 8x50 Finder

Focal reducer: Skywatcher Esprit 100 F5.5 flattener

Software: PixInsightPHD guidingNebulosity

Filter: Baader Planetarium LRGB Filter Set

Resolution: 3987x2662

Dates: Feb. 20, 2015

Frames: 73x240"

Integration: 4.9 hours

Avg. Moon age: 1.16 days

Avg. Moon phase: 1.52%

Astrometry.net job: 591585

RA center: 83.785 degrees

DEC center: -5.377 degrees

Orientation: 178.825 degrees

Field radius: 2.224 degrees

Description

Title: M42 wide field
Optic: Skywatcher Esprit 100/550 Refractor
Flatner: Skywatcher Esprit 100/550 Flattner
Filter: Baader 50mm LRGB
Camera: SBIG STL11000M C2 at -25°C, capture with Nebulosity3
Mount: Skywatcher AZ-EQ6-GT
Guiding: 50mm Finder, ASI120MM, openPHD2, DitherHigh, scale 3
Exposures: L 34x4min (25 true L, 9x from RGB);
RGB 56:52:48min, subexposure 4min
RGB 125:125:125sec, subexposure 25s
29x Darks, 180x Bias, 42x Flat (green), 41x Flat (L)

Location:
Date1: 2015-02-20, Vockenroth, Germany, RGB Frames
Date2: 2015-03-09, Defersdorf, Germany, L-Frames

Processing

Pixinsight:
Image Calibration, CosmeticCorrection, StarAlignment, Image Integration, ChannelCombination, DBE, STF-Stretching, Drizzle Integration for L, 2x Resample for RGB, L-RGB Combination, HDRMT
PS:
Blending of the Huygens-Region with 125s Image, masked denoise, Dynamic, Levels, HighPass Sharping
Pixinsight:
SCNR to green, DSE Script, 3x StarMask, masks combining with PixelMath, multi MT and MMT for star removal
PS:
Shadows and Highlights, denoise, masked Hue and Saturation, Levels, Dynamic, masked SelectiveColor, masked Highpass Sharping, blending of stars, mixing of two versions of this image, masked HighpassSharping, repair of a reflex

Original: only RGB from date1
Version B: LRGB with workflow as stated above
Version C: Stars removed with MT and MMT
Final: LRGB with workflow as above but something harder

Thomas Jäger
www.starhopper.de

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Orion Nebula M42 wide field, starhopper

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