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Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
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NGC2244, Rosette Nebula, Altair 183M, 20x180s, 





    
        

            turfpit
NGC2244, Rosette Nebula, Altair 183M, 20x180s

NGC2244, Rosette Nebula, Altair 183M, 20x180s

Technical card

Resolution: 3363x2660

Dates:Feb. 26, 2019

Frames: 20x180" (gain: 200.00) bin 1x1

Integration: 1.0 hours

Darks: ~20

Flats: ~100

Bias: ~100

Avg. Moon age: 22.15 days

Avg. Moon phase: 50.03%

Bortle Dark-Sky Scale: 8.00

Astrometry.net job: 2558894

RA center: 97.939 degrees

DEC center: 5.060 degrees

Pixel scale: 2.072 arcsec/pixel

Orientation: 134.659 degrees

Field radius: 1.234 degrees

Data source: Backyard

Description

The Rosette is not best placed for me now as it is moving into the sky-glow produced by the Manchester (UK) conurbation. My intent was to capture extensive nebulosity at the expense of star saturation (in the open cluster NGC2244).

Equipment: Altair 66ED refractor, Altair 183M camera, 0.8x reducer/flattener, Celestron AVX mount.
Software: SharpCap 3.2, FITS Liberator, SiriL 0.9.10, Gimp 2.10.
Capture: 20x180s, 20 darks, 100 bias, 100 flats. *Unguided*.

The black level setting of 30 in SharpCap was decided by taking single bias frames and using the minimum black level setting which gave a centralised/balanced histogram in FITS Liberator.

Mount alignment was achieved with polar scope, 2 alignment stars, 4 calibration stars and an All Star Polar Align. Focus was with a Bahtinov Mask.

SiriL: calibrate, register, stack frames, background extraction, apply histogram transformation and export to TIFF.
GIMP: Curves, levels, shadows-highlights, contrast, slight noise reduction.

If I get a chance, I will repeat this capture with the same exposure (maybe gain 400) but using an Ha filter.

Dave

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turfpit
turfpit
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NGC2244, Rosette Nebula, Altair 183M, 20x180s, 





    
        

            turfpit