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.