NGC4298 and NGC4302 in Coma Berenices


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Exposure Data: 4/21/2002.  LRGB: 18x5m, 6x5m, 6x5m, 6x8m. -15°C, 1.0 arc-sec./pixel
Processing: Acquired via script with Maxim, reduced, background corrected and aligned in Mira, 2x RGB and RGB combine in Maxim. L 3x CCDSharp. PS: LLRGB 50% using unsharpened L, 2x upsample, 2.0 x shift, 0.5 y shift and 2x downsample. Flatten image, 0.5 gaussian blur, unsharp mask and final curve and level in Photoshop.
Optical System: 10” Ritchey-Chretien @ F/7.2, ST-8E NABG/CFW-8A CCD camera, STV/FSQ-106, AP900GTO mount.
Comments: Seeing 3.7 arc-sec. Used B. Johnston’s pixel shift idea in Photoshop to reduce star bloat and correct RA elongation. This is a great technique and introduces minimal artifacts. NGC4302 is the edge-on galaxy.