Telescope size to detect Ceres (Newtonian) What is the minimum size telescope required to enable clear visual detection of Ceres?
Ceres varies between mag 9.3 and mag 6.7 which are below the nominal naked eye limiting magnitude of ~5. The gain in limiting magnitude for something like 10x50 binoculars (~4.5 magnitudes) would bring Ceres even at its faintest above the limiting magnitude of about 9.5.