NGC2357 in Gemini

 

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Description: This faint galaxy measures 0.4 x 3.3 arc-min.  NW is up.
 
Exposure Data: 2/7/2003.  LRGB: 8x10m, 4x7m, 4x7m, 4x10m, RGB 2x2. -20C, 0.56 arc-sec./pixel.
 
Processing: Acquired via Sequencer, reduced and aligned in Mira, sub-frames and calibration frames combined in Sigma, L: 10x RL in AIP4WIN, gradient removal and RGB combined 1.0:0.9:1.0 in Maxim, LLRGB assembly, curves, levels, mild USM other processing in Photoshop.  10 darks, 20 bias and 10 flats per filter used in calibration, also combined in Sigma.
 
Optical System: 14.5 Ritchey-Chretien truss prototype by RCOS @ F/9, ST-8E USB NABG/CFW-8A CCD camera, AO-7 auto-guided, Paramount ME mount.
 
Comments: Seeing was 2.4 - 2.8 arc-sec.  Deconvolved luminance was 1.7 arc-sec.