The Mars Science Laboratory (MSL) mission dictionary contains classes and attributes specific to the MSL mission and its instruments. Mars Science Laboratory version 1.0.0.0 PDS Build 1.17.0.0 LDDTool version 13.1.0 Built with LDDTool -plJ PDS4_MSL_IngestLDD.xml 2023-02-01 JGW Initial version The MSL_Parameters class is a superclass containing all MSL mission classes. The Observation_Information class provides information about a science observation. This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the common namespace. The active_flight_computer indicates which flight computer "string" (separate sets of electronics) was active when a product was acquired. For MSL there are two redundant flight computers called "strings", also known as Rover Compute Elements (RCEs). Either string, A or B, may be active at any given time. The mission_phase_name identifies a time period within the mission. The producer_institution_name specifies the identity of the facility or institution that produced the product. The product_type element identifies a group of data products within a collection that have some property in common, such as processing level, resolution, or instrument-specific setting. release_number is the identifier of a scheduled release of MSL data from PDS. The first MSL data release has release_number "0001". The release_number for a given product is always the first release in which it appears, and does not change if the product is revised later. Sol_number is the number of the Mars day on which an observation was acquired. Landing day is Sol 0. The spacecraft_clock_partition provides the clock partition active for the spacecraft_clock_start and spacecraft_clock_stop attributes. This attribute may be used when the spacecraft_clock values do not include a partition number. The spacecraft_clock_start is the value of the spacecraft clock at the beginning of an observation, in seconds. Values are formed according to the pattern [p/]dddddddddd[.fffffffff], where p is an optional partition number, dddddddddd is a whole number of seconds up to 10 digits, and .fffffffff is an optional fraction of a second up to 9 digits. The whole number and fraction are separated by a period. If a partition number and slash are not present, then the attribute spacecraft_clock_partition must be used. The spacecraft_clock_stop is the value of the spacecraft clock at the end of an observation, in seconds. Values are formed according to the pattern [p/]dddddddddd[.fffffffff], where p is an optional partition number, dddddddddd is a whole number of seconds up to 10 digits, and .fffffffff is an optional fraction of a second up to 9 digits. The whole number and fraction are separated by a period. If a partition number and slash are not present, then the attribute spacecraft_clock_partition must be used. Start_local_true_solar_time is the local true solar time, as defined in the main PDS4 data dictionary, at the beginning of an observation. The start_local_true_solar_time_sol element specifies the number of solar days elapsed since a reference day (e.g. the day on which a landing vehicle set down) for local true solar time (LTST). Days are measured in rotations of the planet in question from midnight to midnight. The reference day is '0', as Landing day is Sol 0. If before Landing day, then value will be less than or equal to '0' and can be negative. Start_local_true_solar_time_sol should accompany the attribute start_local_true_solar_time if that attribute's value does not include a sol number prefix. Stop_local_true_solar_time is the local true solar time, as defined in the main PDS4 data dictionary, at the end of an observation. The stop_local_true_solar_time_sol element specifies the number of solar days elapsed since a reference day (e.g. the day on which a landing vehicle set down) for local true solar time (LTST). Days are measured in rotations of the planet in question from midnight to midnight. The reference day is '0', as Landing day is Sol 0. If before Landing day, then value will be less than or equal to '0' and can be negative. Stop_local_true_solar_time_sol should accompany the attribute stop_local_true_solar_time if that attribute's value does not include a sol number prefix.