Brightness of long-period comets observed at large heliocentric distances—I. The computer catalogue for 1861–1941

A catalogue of about 3400 magnitude values for 26 long-period comets observed at heliocentric distances greater than 2.5 AU can be obtained from the author. The list contains the dates of observations, the apparent brightness of comets and the types of magnitudes, the methods, the diameters of objectives and the light-gathering powers of the telescopes used, the types of instruments, the names of observers and references to original literature as well as the calculated values of heliocentric and geocentric distances and phase angles for the dates of observations.