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Mapped and TrueRGB color composition for 20 panels mosaic of winter nebulae in Aurigae

Technical card

Imaging telescope or lens: Takahashi FSQ106ED

Imaging camera: Alta U8300

Mount: CGEM

Guiding telescope or lens: Takahashi FS60-CB

Guiding camera: Atik 16IC

Software: PixInsight 1.8StratonMaximDL 5Adobe Photoshop CS5

Filters: Ha 5nmOIII 5nmSII 5nm

Accessory: Atik EFW2 Filter Wheel

Resolution: 5857x4105

Dates: Dec. 31, 2013

Frames: 1x297000"

Integration: 82.5 hours

Avg. Moon age: 27.83 days

Avg. Moon phase: 3.23%

Astrometry.net job: 150460

Locations: Observatoire personnel, Vérossaz, Valais, Switzerland

Description

To compose this image I used Photoshop CS5 with three layers:
SHO as background layer
RGB as darken layer with 65% opacity
RGB stars only as screen layer with 100% opacity

Captured over 19 nights 11/11/2013, 11/25/2013, 11/26/2013, 11/27/2013, 11/30/2013, 12/01/2013, 12/02/2013, 12/03/2013, 12/04/2013, 12/05/2013, 12/07/2013, 12/08/2013, 12/09/2013, 12/10/2013, 12/11/2013, 12/12/2013, 12/13/2013, 12/15/2013, and 12/16/2013 with Takahashi FSQ106ED @f/5 530mm focal length with Apogee Alta U8300 monochrome and Astrodon H-a, SII, OIII 5nm narrowband filters and Astrodon TrueBalance RGB filters.

77 x 1200s H-a unbinned = 25h40m
59 x 1200s OIII unbinned = 19h40m
62 x 1200S SII unbinned = 20h40
65 x 300s Red binning 2x2 = 5h25
66 x 300s Green binning 2x2 = 5h30
66 x 300s Blue binning 2x2 = 5h30

Total exposure time used to build this image = 82h25m

Total cumulated capture time over 19 nights with all filters = 119h30m

Software: MaximDL to capture, calibrate, register, normalize, data reject and combine - Straton for stars removal - Photoshop CS5 and PixInsight for HDR processing and non-linear streching and color combine.

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Author

David Lindemann
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Mapped and TrueRGB color composition for 20 panels mosaic of winter nebulae in Aurigae , David Lindemann