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Position section

The position section is described in the Table [*]. Note that the source position is described as the offsets between the actual (reconstructed) position (RA or longitude, DEC or latitude) and the nominal (commanded) position (RA_NOM, DEC_NOM). This also means that for Solar System Objects (SSO), the offsets are not expressed in the comoving frame, but from a fixed position on sky.





Table: Look-up table between the CLASS Position section and the Herschel-HIFI FITS. Depending on the FITS structure (pipeline level), some elements found in a FITS header or in a FITS binary table. FITS names are case sensitive.
CLASS Type Value Default
sourc C*12 Card OBJECT UNKNOWN
system I*4 CLASS internal code for Equatorial system
equinox R*4 Card EQUINOX Error
proj I*4 CLASS internal code for Radio projection
lam R*8 Card RA_NOM Error
bet R*8 Card DEC_NOM Error
projang R*8 0.d0
lamof R*4 Offset in current projection between card RA_NOM and 0, i.e. actual position
card RA (level 2.5) or column longitude (level 2.0) defaults to nominal
betof R*4 Offset in current projection between card DEC_NOM and 0, i.e. actual position
card DEC (level 2.5) or column latitude (level 2.0) defaults to nominal


next up previous contents
Next: Calibration section Up: Look-up tables Previous: Spectroscopic section   Contents
Gildas manager 2023-06-01