RCOS 10” F/9 RC, SBIG STL11K, L:60m, RGB:10m, 2X bin
WhaleGalaxyColor NGC4631 ARP 281
Amateur CCD Astronomy
By Richard D. Jacobs, M.D.
By Richard D. Jacobs, M.D.
RCOS 10” F/9 RC, SBIG STL11K, L:60m, RGB:10m, 2X bin