TGO CaSSIS Partially Processed Data

Instrument: CASSIS

PDS4 Collection: urn:esa:psa:em16_tgo_cas:data_partially_processed

PDS4 Bundle: urn:esa:psa:em16_tgo_cas

All images acquired during the nominal science phase mission (post 2019-04-21) are delivered to the PSA (Planetary Science Archive) as calibrated. However, datasets from the Commissioning, Mars Capture Orbit and In-Orbit Commissioning phases of the mission have not been calibrated with the straylight and framelet to framelet offset correction by UBE (the University of Bern). These datasets are therefore classed as partially processed. The image data for each framelet and a corresponding xml label file is delivered by UBE to ESAC (European Space Astronomy Centre). Once the xml file is made PDS4 compatible by the parser, it is ingested into the PSA. Browse/stitched_browse products for this partially processed data are not delivered to the PSA. See CASSIS EXPERIMENT TO ARCHIVE INTERFACE CONTROL DOCUMENT for more information about this type of product.

CaSSIS Partially Processed science data stored on the PSA follow the LID naming convention:

cas_par_sc_YYYYMMDDThhmmss-YYYYMMDDThhmmss-CCC-NN-FFF-UID-SEQ-WIN.<ext>

where:

YYYY = year, MM = month, DD = day, hh = hour, mm = minute, ss = second. The two times are the beginning and end time in UTC of the full image sequence respectively (see below for details).

CCC = orbit number

NN = observation number (from science file name)

FFF = filter used (BLU, RED, NIR, PAN)

UID = image id

SEQ = sequence number (sub-exposure in sequence)

WIN = Window number (filter used 1-6). Note window 1 and 6 are the control windows described in Section 3.4. of

CASSIS EXPERIMENT TO ARCHIVE INTERFACE CONTROL DOCUMENT

<ext> = dat, xml, tab for the data, xml, and table file respectively.

The beginning and end time in the filename is given to second resolution. However, the time between CaSSIS exposures is roughly 0.3 seconds. The sub-second beginning time of a framelet observation is not used in the filename. The end time in the filename is always taken to be 4 seconds after the beginning time. This difference is included for consistency across all datasets only, it is not representative of the actual end time of a given framelet exposure.

The times used in the filename should therefore not be used for fine time calculations of when a framelet exposure began and finished. The xml file for a given data product contains the actual framelet observation start time to the milli-second level.