Note on magnitude estimation on digitized astronomical photographic plates

Abstract

© 2020 Astronomical Institute, Slovak Academy of Sciences. The scanned astronomical archival plates offer the possibility of al-ternative analyses on these data. Apart from a complete evaluation by sophis-ticated computer programs, the recent efforts offer an alternative fast method of eye estimation method using scanned plates exhibited on computer screens. This alternative method has been investigated by analyzing the light curve of XX Cep on several hundred scanned sky patrol plates from the Sonneberg Observatory plate archive.