urn:nasa:pds:context:instrument:lucy.rss 1.0 1.21.0.0 Product_Context 2024-06-10 1.0 Initial version urn:nasa:pds:context:instrument_host:spacecraft.lucy instrument_to_instrument_host Lucy Radio Science Radio Science Telecom Subsystem -49 The Lucy Radio Science Investigation uses the spacecraft’s X-band telecommunication system to measure the Doppler shift of the spacecraft. The mass of the Trojans imparts a deltav on the spacecraft. The concept of operations to support the Doppler-shift measurements entails measuring the Doppler signature of the spacecraft before and after the flyby to determine the change in velocity.