3e255347_logue_Format___Stellarium_Wiki_Star_Data_Record_Type_0_Type
[Name] mag [Offset] 10 [Size] 1 [Description] This is the magnitude level in the V-I colour. This value refers to one of 256 discrete steps in the magnitude range for the file [Type] 
unsigned char
i n t
u n s i g n e d c h a r
u n s i g n e d s h o r t i n t
Star Catalogue Format - Stellarium Wiki