NGC 4151
========

Night of 2026-03-26 to 2026-03-27 MST
2026-03-27 UTC

University of Louisville Manner Telescope at Mt. Lemmon Observatory
0.6 meter Ritchie Chretien f/8
ASI 6200 CMOS camera

4 second exposures selected for best seeing and summed after processing for
bias subtraction
flat fielding
median noise removal with 1 pixel radius filter
original images 9476x6388 with pixel scale 0.165 arcseconds/pixel  
final images binned and  summed 4x4 to 2394x1597 at 0.65 arcsecond/pixel
constant sky background subtracted from summed images

WCS added with Astrometry.net code

Sloan filters g', r', i'

Total exposures

File: ngc4151_SUM_Aligned_flat_gp_wcs.fits  Exposure: 232.0
File: ngc4151_SUM_Aligned_flat_ip_wcs.fits  Exposure: 204.0
File: ngc4151_SUM_Aligned_flat_rp_wcs.fits  Exposure: 228.0

Color images map g', r', i' to R, G, and B on a linear scale


Processing with AstroImageJ
Credit: John Kielkopf
License: MIT