This text file contains the nominal spacecraft to object center vector and camera orientation all in inertial space (J2000) for each picture. IFRAME.TXT is created by the routine make_sumfiles.
In IFRAME.TXT, the SCOBJ vector is in meters. RA, DEC, and TWIST are in degrees. SRA and SDEC are the error in RA and DEC, respectively, in milli-arcseconds.
IFRAME.TXT used to be created by IFRAME.f with the understanding that, if it was needed, it would be run right after make_sumfiles. However, that was confusing and fraught with peril.
IFRAME.TXT is now used by OMEGA. It lets you get an approximate solution for the transformation from inertial to body-fixed and, if desired, to update the sumfile accordingly. Of course, since there are uncertainties in the nominal values, this isn't quite right, and you must run REGISTER to align with the current shape model.
Here is a sample IFRAME.TXT file:
PICNM UTC SCOBJx SCOBJy SCOBJz RA DEC TWIST SRA SDEC P595033964F2 2018 NOV 09 11:11:36.008 0.1393877134D+03 -0.2052581418D+02 -0.9569192088D+01 -8.37947 -3.88812 88.65648 176.39833 2.27588 P595034390F2 2018 NOV 09 11:18:42.324 0.1393248422D+03 -0.2052504806D+02 -0.9564763229D+01 -8.37947 -3.88812 88.65648 176.40259 2.27349 P595034816F2 2018 NOV 09 11:25:48.640 0.1392619628D+03 -0.2052427823D+02 -0.9560332270D+01 -8.37947 -3.88812 88.65648 176.40685 2.27109 P595035242F2 2018 NOV 09 11:32:54.955 0.1391990760D+03 -0.2052351109D+02 -0.9555902818D+01 -8.38640 -3.88409 88.66071 176.41111 2.26869 ...
(Compiled by KD)