NGC253, Galaxy in Sculptor


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Description: This galaxy is the brightest of the Sculptor group, which is the nearest to our own local group.  It is 10 million light years distant.
Exposure Data: 10/31/2002.  LRGB: 8x10m, 4x7m, 4x7m, 4x10m, RGB 2x2. -15C, 1.0 arc-sec./pixel.
Processing: Acquired via script with Maxim, reduced and aligned in Mira, L 50x RL in AIP4WIN, Debloomer, RGB combine in Maxim, LRGB combine, curves, levels and other processing in Photoshop.
Optical System: 10 Ritchey-Chretien @ F/7.2, ST-8E USB NABG/CFW-8A CCD camera, guided by FSQ-106/STV, Paramount ME mount.
Comments: Average deconvolved FWHM was 2.8 arc-sec.  Due to the low elevation and shooting over Tucson, a nearby star field was also taken with to be used as a source for gradient correction in Mira.  RGB combine ratios were 1:1.1:1.3 to correct somewhat for extinction.