Best Star Atlases

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The limiting magnitude of an atlas is what has to match your telescope, and mismatching it is the reason a beautiful book gathers dust. A naked-eye atlas plotting stars to magnitude 5.5 across sixteen maps is a guide to constellations and planet positions, and at the eyepiece of an 8 inch reflector it is useless, because the field you are looking at contains dozens of stars the chart does not show and nothing to star-hop along. Atlases built for small telescopes go several magnitudes deeper and plot on the order of 1,500 deep-sky objects across 80 charts, which is the depth at which the pattern in the eyepiece matches the pattern on the page. Deeper still are the atlases organized around a set list of a few hundred best objects with images alongside the charts, which are excellent for planning and thinner for hopping. Format is the second decision and it is more practical than it sounds. Spiral binding lies flat on a table in wind, which a perfect-bound book will not do, and the choice between a pocket edition and a jumbo edition of the same atlas is a straight trade between what fits in a jacket and what you can read by red light without glasses at two in the morning. Chart scale follows from that, since larger pages spread the same stars further apart and are easier to match to a finder view. Digital editions are searchable but a lit screen destroys dark adaptation.