Required Reading : The format of all VIRTIS data are described in detail by the EAICD document located in the /DOCUMENT directory. VIRTIS team strongly recommends reading this documentation before using the data. Data Set history : This data set is version V2.0. The changes from the V1.0 enclose the closure of the liens from the 2017 review: - updates of documents such as EAICD, M and H calibration. - updates of AAREADME, ERRATA and DATASET.CAT - Updates of the data as the team found a bug in the calibration pipeline. Data Set Overview : This data set contains cal data acquired by the Rosetta Orbiter VIRTIS spectrometer during the PRELANDING MTP004 of the Rosetta mission. Processing : The data in this data set are cal, CODMAC Level 3 data. Only the calibration algorithm has been applied to the data. Data : The data are in PDS format. A detailed description of the data format is given in the VIRTIS EAICD document located in the DOCUMENT directory of this data set. Ancillary Data : No ancillary data included in this data set. Coordinate System : The geometry items SC_SUN_POSITION_VECTOR, SC_TARGET_POSITION_VECTOR and SC_TARGET_VELOCITY_VECTOR provided in the label of the data product are relative to the Earth Mean Equator frame of J2000. SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in the PLANETOCENTRIC coordinate system. These parameters are corrected by planetary and stellar aberrations. Distances are given in km, angles in degrees. Software : The data can be accessed with the software IDL routines provided and documented in the EXTRAS directory.

Confidence Level Overview : Data confidence is nominal, meaning that for all data have been validated by the VIRTIS team and found as expected. Any exceptions are noted by the DATA_QUALITY field in the label files. Review : This data set have undergone an external review in Autumn 2017. Data Coverage and Quality : Data quality is good unless otherwise noted by the DATA_QUALITY keyword. Limitations : No limitations on these data