API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Oct 25, 2025 Lucy Spacecraft / Sun -49 https://www.nasa.gov/mission_pages/lucy/main/index https://blogs.nasa.gov/lucy/ http://lucy.swri.edu/ Lucy launched 2021-Oct-16 @ 09:34 UTC from Cape Canaveral, Florida (SLC-41) on an Atlas V 401 launch vehicle. BACKGROUND: The 12-year mission will fly past seven different asteroid systems; two main belt objects and five Jupiter Trojans, two of which are known to have satellites (so at least nine objects in total). Flybys (UTC): * 2022-Oct-16 Earth gravity assist #1 (@11:04:30.75 UTC, 359.727 km altitude from surface) * 2023-Nov-01 152830 Dinkinesh (1999 VD57) 700 m diameter target-of-opportunity added Jan 24, 2023 (@16:54:41.3 UTC; 430.608 km flyby) * 2024-Dec-13 Earth gravity assist #2 (356.425 km alt. @ 04:15:45.7 UTC) * 2025-Apr-20 52246 Donaldjohanson (4 km diameter; inner main belt) 961.429 km flyby @ 17:51:16 UTC 2027-Aug-11 3548 Eurybates (64 km diameter; 1 km diameter satellite Queta; binary C-type Jupiter L4) 2027-Sep-15 15094 Polymele (21 km diameter; binary P-type; Jupiter L4) 2028-Apr-18 11351 Leucus (34 km diameter; D-type; slow rotator (466 hrs); Jupiter L4) 2028-Nov-11 21900 Orus (51 km diameter; D or C-type; possible binary; Jupiter L4) 2030-Dec-27 Earth gravity assist #3 (614.858 km altitude) 2033-Mar-03 617 Patroclus (113 km diameter; 104 km satellite (Menoetius) at 680 km separation; Jupiter L5) 2033 End-of-mission. Lucy will continue to orbit the Sun, passing through the alternating Trojan swarms for hundreds of thousands, or perhaps millions, of years. SPACECRAFT PHYSICAL CHARACTERISTICS: Width : 14.25 m (46.75 ft) Height : 7.2 m (23.6 ft), or 3.8 m w/solar panels stored Depth : 2.78 m (9.12 ft) Solar Panel diameter: 7.3 m (23.9 ft) Dry Mass (unfueled) : 821 kg (1810 lbs) Wet Mass (fueled) : 1550 kg (3417 lbs) Power : 504 watts (at furthest encounter) SCIENCE INSTRUMENTS: L'Ralph - Color visible imager (the Multi-spectral Visible Imaging Camera, MVIC, 0.4-0.85 microns) and infrared imaging spectrometer (Linear Etalon Imaging Spectral Array, LEISA, 1-3.6 microns). L'LORRI - LOng Range Reconnaissance Imager; high spatial resolution visible imager. Panchromatic, covering the wavelengths 0.35-0.85 microns L'TES - Thermal Emission Spectrometer (6-75 microns). Similar to instruments flying on OSIRIS-REx and Mars Global Surveyor. High gain antenna - Mass determination via Doppler shift tracking. TRAJECTORY: Nominal asteroid trajectories consistent with flight-project planning are available for use as observing center (with '@' prefix ) or target (drop '@'): @ 20152830 (152830 Dinkinesh (1999 VD57)) @ 20052246 (52246 Donaldjohanson) @ 20000617 (617 Patroclus) @ 20011351 (11351 Leucus) @ 920015094 (15094 Polymele, body center) @ 20021900 (21900 Orus) @ 920003548 (3548 Eurybates, body center) Maneuver plan: (m/s) TCM Name (DSM #) Date Delta-V Thrust Start Target Event/Object *TCM-02a 2-MAR-2022 1.252 17:00:00.000 DSM-1 *TCM-03 7-JUN-2022 4.205 17:00:00.000 Biased EGA-1 *TCM-04 21-JUN-2022 1.531 17:00:00.000 Biased EGA-1 *TCM-04a 3-AUG-2022 0.415 17:00:00.000 EGA-1 *TCM-08a 9-MAY-2023 3.441 17:00:00.000 Dinkinesh Encounter *TCM-08c 29-SEP-2023 0.061 17:00:00.000 Dinkinesh Encounter *DSM-2A/TCM-09A 31-JAN-2024 100.012 17:00:00.000 DSM-2B *DSM-2B/TCM-09B 3-FEB-2024 799.325 22:00:00.000 EGA-2 biased *TCM-10 24-FEB-2024 17.189 17:00:00.000 EGA-2 biased *TCM-10a 19-MAR-2024 0.838 16:00:00.000 EGA-2 *TCM-10b 14-MAY-2024 0.247 17:00:00.000 EGA-2 *TCM-11 13-NOV-2024 0.089 17:00:00.000 EGA-2 *MEF-1 24-JAN-2025 2.315 17:00:00.000 Dj Encounter *TCM-16 13-APR-2025 0.068 17:00:00.000 Dj Encounter MEF-2 2-MAR-2026 2.357 17:00:00.000 Eurybates (w/DSM-3) DSM-3/TCM-18 3-APR-2027 312.713 21:30:00.000 Eurybates Encounter TCM-22 19-AUG-2027 0.469 17:00:00.000 Polymele Encounter DSM-4/TCM-24 28-SEP-2027 123.279 23:30:00.000 Leucus Encounter DSM-5/TCM-29 26-JUL-2028 341.182 08:00:00.000 Orus Encounter TCM-33 11-DEC-2028 0.095 17:00:00.000 EGA-3 TCM-37a 27-JUN-2031 1.493 17:00:00.000 PM Encounter (* above denotes a completed event as of this trajectory update) Post-launch trajectory from navigation (begins after booster separation). Data fit through 2025-Sep-08, prediction thereafter: NOTE: Only the reference trajectory through 2033 will be updated when revised instead of presenting more-frequent but short-term local OD reconstructions. Name Start (TDB) Stop (TDB) --------------------------------------------------- ----------- ----------- lcy_211016_330402_250730_OD093-R-MEF2-P-TCM37a-P_v1 2021-Oct-16 2033-Apr-02 *******************************************************************************