urn:esa:psa:context:instrument:rl.sd2 1.0 1.16.0.0 Product_Context 2021-06-15 1.0 Migrated from PDS3 catalog file. urn:esa:psa:context:instrument_host:spacecraft.rl instrument_to_instrument_host 10.1007/s11214-006-9134-6 Ercoli-Finzi, A. et al., SD2 - How To Sample A Comet, Space Sci. Rev., 128(1-4), 281-299, Feb. 2007. Reference to the instrument paper. Sampling, Drilling and Distribution Subsystem Sub-Surface Tool not applicable not applicable Instrument Overview =================== SD2 is a subsystem that aim to collect samples from the ground of comet, verify volume of sample by an item called Volume Checker, and distribute the collected samples to the others experiments (CIVA and COSAC). SD2 is composed by a Drill, Carousel, Volume Checker and electronic box. The Drill creates the hole and collects samples at different depths. The samples are placed in ovens mounted on the distribution subsystem, the Carousel, which is in charge of distributing the samples to the designated experiment. Before distribution, the volume of the collected sample is measured by the Volume Checker. Scientific Objectives ===================== The scientific goal of SD2 is to collect samples from the comet soil, measure the volume of the sample using the Volume Checker, and distribute the collected samples to the experiments CIVA and COSAC. In conjunction with complementary data from lander subsystems and instruments, SD2 scientific data can also be used to determine the depth at which the sample has been collected. Calibration =========== No calibration is planned for the telemetry data. Only a translation in more comprehensible format is performed. Thus, the calibrated data are obtained by the mere translation of the raw data. Operational Considerations ========================== SD2 translation is commanded in offsets from SD2 reference (zero) position. Thus, the operator cannot command the depth directly: the depth reached can be deduced if the distance of the soil from the lander baseplate in the drilling area is available. Operational Modes ================= Two main operational modes are foreseen for SD2 Nominal and Dead mode. The first one is for the nominal operational mode; the second one is associated to failure occurrence. Measured Parameters =================== Drill position; Drill rotation speed; Carousel position.