Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 2252, NGC 2244, Rosette nebula, NGC 2239, The star 12Mon
Getting plate-solving status, please wait...
NGC2244, Rosette Nebula, Altair 183M, 20x180s, 


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 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


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.




License: None (All rights reserved)

Sky plot

Sky plot


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