New Horizons Student Dust Counter (SDC) Data Archive Bundle This bundle will contain the following collections: New Horizons SDC data collections, one for each mission phase and processing level (raw and calibrated). In general these will contain tables in .FIT format from the SDC instrument. Reference Files Used in Calibrating Data from the New Horizons SDC Instrument contains a cumulative set of ancillary files (coefficient table, mean DN table and DN standard deviation table, calibration matrix) used in calibrating the data sets delivered by the Student Dust Counter (SDC) instrument over the course of the New Horizons primary and extended missions. See each collection's overview file for further details. This bundle was created by the Small Bodies Node of the Planetary Data System as part of migration from PDS3 to PDS4. The data collections from the prime mission and KEM1 extended mission found in this bundle were originally migrated from PDS3 datasets produced by the New Horizons SOC. All other extended mission data is produced by the New Horizons SOC using the PDS4 standards.