- aiapy.calibrate.util.get_pointing_table(start, end)¶
Retrieve 3-hourly master pointing table from the JSOC.
This function queries JSOC for the 3-hourly master pointing table (MPT) in the interval defined by
end. The 3-hourly MPT entries are computed from limb fits of images with
A MPT entry covers the interval
[T_START:T_STOP); that is, the interval includes
While it is generally true that
TSTOP = T_START + 3 hours, there are edge cases where
T_STOPis more than 3 hours after
T_STARTbecause of a calibration, an eclipse, or other reasons, but the fits are still calculated based on images from
T_START + 3 hours. Pointing is not stable during these periods, so the question of which MPT entry to use is not relevant.