Wikipedia's /Lucy (spacecraft) says nothing of propulsion, and it's SWRI home page for the spacecraft http://lucy.swri.edu/mission/Spacecraft.html gives specification and enumerates what's on Lucy’s instrument pointing platform (IPP) , but is silent on things like propulsion, attitude control, navigation, etc. Here are the specifications:

LUCY SPECIFICATIONS

Width:                      46.75 ft (14.25 m)
Height:                     23.6 ft (7.2 m) or 12.4 (3.8m) when solar panels are stored)
Depth:                      9.12 ft (2.78 m)
Diameter of Solar Panels:   23.9 ft (7.3 m)
Dry Mass (unfueled):        1810 lbs (821 kg)
Wet Mass (fueled):          3417 lbs (1550 kg)
Power:                      504 watts at the furthest encounter


Fuel is 47% of the mass, so this is a "flying fuel tank"-class spacecraft, with a larger fuel fraction than the electrically propulsed DAWN but well below the 60 to 70% of the winners.

This answer to What propulsion will Lucy use for its deep space maneuvers? cites only an article about a different mission that mentions conventional propulsion for Lucy in passing, then speculates further.

Question:

Refining Lucy Mission Delta-V During Spacecraft Design Using Trajectory Optimization Within High Fidelity Monte Carlo Maneuver Analysis (Preprint) AAS 19-614

update: I found the words "bipropellant main engine" in Refining Lucy Mission Delta-V During Spacecraft Design Using Trajectory Optimization Within High Fidelity Monte Carlo Maneuver Analysis (Preprint) AAS 19-614 J. V. McAdams et al. (2019??) along with some uncertainties in delta-v that might offer some clues.

Several major Deep Space Maneuvers (DSMs) shown in Lucy: Navigating a Jupiter Trojan Tour, AAS 17-632 D. Stanbridge et al.

• More about Lucy: How will Lucy “make use” of a deep space atomic clock?
– uhoh
Feb 5, 2021 at 4:01
• Yes, AAS19 was a conference in (August) 2019. It was the AIAA/AAS Astrodynamics Specialist Conference, held in Portland, Maine. Feb 5, 2021 at 5:48
• yes! The 2019 conference proceedings with titles and abstracts are available here: space-flight.org/docs/2019_summer/2019_summer.html. All of the AAS/AIAA conference proceedings are here: space-flight.org/conferences.html. However, you might need to purchase copies of the papers themselves, albeit lots of authors republish their papers on their websites. Therefore, searching the paper number usually leads to good results. Feb 5, 2021 at 18:21
• @ChrisR I'm off to the library today then, thanks!
– uhoh
Feb 6, 2021 at 2:20
• Nammo (makers of LEROS series engines) claims Lucy uses the LEROS-1c Oct 8, 2021 at 14:55