Use Ra,Dec input files (usually built with gstar2) to derive a new IHMP for shifting a target onto another position (in this case and IFU).

ifu_shift A_ihmp.rd A_startp.rd A_endp.rd 
06:15:38.7165 +39:40:40.269

Here is a sample of files:
% cat A_ihmp.rd
06:15:20.46 +39:51:50.6
% cat A_startp.rd
06:15:43.791 +39:43:14.05
% cat A_endp.rd
06:15:25.527 +39:54:24.40