* Astronomy

Title: SW Horologii—A Mira Variable Star
Author: Peter Williams

Abstract :
Visual observations of the little studied Mira variable star SW Hor during the 18-year interval 1986 through 2003 are presented. These provide the basic parameters of its variability, information that had previously been lacking from the catalogue data. An extreme visual magnitude range of 9.9 to fainter than 15 is found and a mean period of 283 ± 13 days determined. Elements for maximum brightness are JD 2447124 + 283 ± 13 days.



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