Lucy (spacecraft)
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| Lucy (spacecraft) | |
|---|---|
| Name | Lucy |
| Mission type | Space probe |
| Operator | NASA/Southwest Research Institute |
| COSPAR ID | 2021-106A |
| Mission duration | Primary: 12 years (planned) |
| Spacecraft bus | Custom |
| Launch date | October 16, 2021 |
| Launch vehicle | Atlas V |
| Launch site | Cape Canaveral Space Force Station |
| Manufacturer | Lockheed Martin, NASA centers, Southwest Research Institute |
Lucy (spacecraft) is a NASA robotic mission to study the population of Jupiter Trojan asteroids located near the Sun–Jupiter Lagrange points. Developed and managed by the Southwest Research Institute and launched by United Launch Alliance on an Atlas V rocket from Cape Canaveral Space Force Station, Lucy aims to characterize the geology, composition, and dynamical history of multiple small bodies to test models of Solar System formation. The project involves teams from NASA Goddard Space Flight Center, Lockheed Martin, academic partners, and international collaborators.
Overview
Lucy is a Discovery Program-class mission selected by NASA and announced in 2017 alongside the Psyche mission, conceived to fill gaps left by programs such as New Horizons and Dawn (spacecraft). The spacecraft will perform numerous flybys of diverse targets drawn from the Jupiter Trojan swarms at the Sun–Jupiter L4 and L5 points to provide comparative data complementary to investigations by Galileo (spacecraft), Cassini–Huygens, and OSIRIS-REx. The mission's planned 12-year primary timeline uses gravity assists and resonant orbits to reach both Trojan camps and an inner-main-belt asteroid, leveraging expertise from institutions including Southwest Research Institute, Brown University, University of Colorado Boulder, and international partners.
Mission design and objectives
Lucy was designed under the NASA Discovery Program to test hypotheses about planetary migration scenarios such as the Nice model and the Grand Tack hypothesis by probing primitive bodies that may be remnants of early Solar System planetesimals. Primary objectives include mapping surface geology, measuring bulk composition, assessing interior structure through mass and density estimates, and comparing spectra across targets to infer links to populations studied by Hayabusa2, OSIRIS-REx, and telescopic surveys conducted with facilities like the Hubble Space Telescope and the Large Binocular Telescope. Scientific goals tie into broader frameworks developed at NASA Goddard Space Flight Center, Jet Propulsion Laboratory, and university research groups focused on Solar System evolution, small-body dynamics, and cosmochemistry.
Spacecraft and instruments
The Lucy spacecraft bus was constructed by Lockheed Martin and integrates instruments provided by a consortium including teams from Southwest Research Institute, University of Colorado Boulder, Johns Hopkins University Applied Physics Laboratory, and other academic institutions. The payload suite includes a high-resolution visible imager, a thermal infrared spectrometer, and a color imaging spectrometer to obtain compositional and morphological data comparable to instruments on New Horizons, Dawn (spacecraft), and Rosetta (spacecraft). Spacecraft subsystems draw on heritage from missions such as Mars Reconnaissance Orbiter and incorporate radio science experiments using the Deep Space Network to determine masses and gravity fields of flyby targets. Engineering design emphasizes low-mass, low-power operation to enable multiple high-speed flybys across wide heliocentric distances.
Launch and trajectory
Lucy launched on October 16, 2021, aboard an Atlas V rocket operated by United Launch Alliance from Cape Canaveral Space Force Station, following integration at Kennedy Space Center and mission verification at NASA Goddard Space Flight Center. The trajectory uses two Earth gravity assists and resonant return orbits to alter orbital inclination and semi-major axis, enabling encounters with an inner-main-belt asteroid and both the leading L4 and trailing L5 Jupiter Trojan camps. Navigation and trajectory design leveraged tools and expertise from Jet Propulsion Laboratory, NASA Ames Research Center, and mission navigation teams experienced with complex trajectories executed by missions like MESSENGER and Cassini–Huygens.
Encounter timeline and science results
Lucy's encounter campaign visits a sequence of targets, beginning with a flyby of an inner-main-belt asteroid followed by multiple flybys of L4 Trojans such as (3548) and others, then a long cruise and subsequent insertion to fly several L5 Trojans. Each encounter yields high-resolution imaging, spectroscopic mapping, and radio science data that inform comparative analyses with meteorite collections curated by institutions like the Smithsonian Institution and compositional classifications derived from ground-based surveys conducted at Mauna Kea Observatories and the Very Large Telescope. Preliminary results from early targets have addressed surface variety, spectral diversity, and clues about volatile retention, informing models tested against work from University of Arizona and Massachusetts Institute of Technology investigators studying Solar System formation pathways.
Mission operations and management
Mission operations are coordinated by the Southwest Research Institute with flight operations support from Lockheed Martin and science management by teams at NASA Goddard Space Flight Center and the Jet Propulsion Laboratory. The project follows programmatic oversight by NASA headquarters and integrates instrument teams and academic collaborators from institutions such as Brown University, Stanford University, University of California, Berkeley, and international partners. Operations tasks include payload commanding, Deep Space Network scheduling, data processing pipelines run at partner institutions, and science analysis coordinated through working groups modeled on collaborations from missions like New Horizons and Rosetta (spacecraft).
Public outreach and legacy
Public engagement for Lucy leverages educational initiatives at Smithsonian Institution museums, planetarium events at institutions like the American Museum of Natural History, and citizen science opportunities facilitated by partners including Zooniverse-style platforms and university outreach programs. The mission’s legacy is expected to reshape understanding of Solar System architecture and to inform future missions proposed to the Planetary Science Division and projects led by institutions such as NASA Jet Propulsion Laboratory and international space agencies, leaving comparative datasets analogous in scope to those from New Horizons, Hayabusa2, and OSIRIS-REx. The mission also strengthens technical and scientific partnerships among NASA centers, industry, and universities, influencing workforce development across the planetary science community.