MEX-M-ESOC-6-AUXILIARY-DATA

Data Set Overview ################# This data set includes the complete set of ancillary information for the Mars Express spacecraft in the form defined by ESOC (European Space Operations Centre). The ESOC auxiliary data contains geometric and other ancillary data needed to recover the full value of science instrument data. In particular ESOC data files provide spacecraft ephemerides, orientation and time correlation information, and sequence of events. Additionally pointing request information and star occultation events are provided in separate files. This data set is contained in a single virtual volume including data from all mission phases and covering from launch, 20030602T19:18:21.799, through the end time of the latest spacecraft trajectory file supplied in the data set. Until the end of the spacecraft or mission lifespan, this data set is accumulating with new data added approximately every three to six months. Data Types ########## This data set contains the following data types: ATNM: file describing pointing, containing a transformation traditionally called the Cmatrix which is used to determine timetagged pointing (orientation) angles for a spacecraft. Instead of storing the Cmatrix, the Mars Express attitude file contains discret quaternions. The attitude file is located under the DATA/ATNM directory in this data set. CMH: TBW EVTM: file type containing the most up to date events consistent with the orbit data form the ORHM and ORMM file types. For each event, one line of information is given. The event files are located under the DATA/EVTM directory in this data set. ORHM and ORMM: files containing ephemerides for the Mars Express spacecraft during the cruise phase and around Mars. They provide position and velocity, given in a Cartesian reference frame. Orbit data files are located under the DATA/ORBIT directory in this data set. PTR: files containing a complete definition of the attitude pointin trun [truncated!, Please see actual data for full text]