Something you need to consider carefully, and a question that comes up often with new observers is "How often should I observe my program stars?" The answers depend largely on the type of stars you are observing. The following table is a general guideline. As you learn more about the different types of variables, and the personalities of some of the specific stars you choose to observe, you may decide to observe them more or less often than suggested here.
These data consist of formally published data for the years 1900 to 2008, and data for the years 2009 through the present for a subset of these stars. Data from 2009 to the present were those used for calculations of the AAVSO Bulletin through 2018, and are considered preliminary. For a description of this data set, please click here.
Stars with maxima and minima data are as follows:
Introduction to Bulletin 74
AAVSO Bulletin 74: Predicted Dates of Maxima and Minima of
371 Long Period Variables for 2011
Elizabeth O. Waagen, Senior Technical Assistant
Matthew R. Templeton, Ph.D, Science Director
AAVSO, 49 Bay State Road, Cambridge, MA 02138 USA
Letter to Users of 2011 Bulletin