Methods of Visual Photometry and Colorimetry

Abstract

A thorough and continuous record of variations in the relative intensities of the different belts, zones, and ring components of Saturn is a valuable data source on any global seasonal atmospheric phenomenon and other fluctuations over time. Observers should make it standard procedure to carry out regular intensity estimates while at the telescope, since there is a definite and rather uniform relationship between relative intensities and the real albedo values of Saturn’s features. Furthermore, after capturing a series of images of Saturn with a CCD camera or webcam during a given observing session, it is crucial not to forget to perform visual estimates of belt, zone, and ring component intensities on the same night.