Note - it is not recommended to use the FitsTable class to store very large tables.
FitsTables are primarily geared towards the needs of the "-TAB" algorithm defined in FITS-WCS paper 2, and so do not support all features of FITS binary tables. In particularly, they do not provide any equivalent to the following features of FITS binary tables: "heap" data (i.e. binary data following the main table), columns holding complex values, columns holding variable length arrays, scaled columns, column formats, columns holding bit values, 8-byte integer values or logical values.
AST A Library for Handling World Coordinate Systems in Astronomy