Lucy, Psyche and Hera: Three Asteroid Missions with Three Different Questions
A Trojan tour, a metal-rich world and a planetary-defence test show how varied asteroid exploration has become.
A Trojan tour, a metal-rich world and a planetary-defence test show how varied asteroid exploration has become. This guide focuses on the reasoning behind the display so you can use the related SpaceTracker.live tracker with confidence rather than treating a moving dot as a complete answer.
Asteroid is a category, not a destination
Small bodies preserve different parts of solar-system history and pose different engineering problems. Grouping every asteroid mission together can hide the purpose of each journey. Lucy, Psyche and Hera travel to distinct populations and use distinct encounter strategies.
Lucy is a travelling survey
Lucy flies past multiple asteroids, including Jupiter Trojans that share the giant planet’s orbit around the Sun. Comparing many targets can reveal diversity among remnants from the early solar system. A flyby mission must gather its closest data during brief, carefully choreographed encounters.
Psyche settles in
NASA’s Psyche mission targets the metal-rich asteroid of the same name in the main belt. It is designed to orbit and map the body over an extended science phase. The central question concerns composition and what this unusual object can teach us about planetary building blocks.
Hera examines an impact experiment
ESA’s Hera heads to the Didymos–Dimorphos binary system after NASA’s DART changed Dimorphos’s orbit through impact. Hera will measure the aftermath in detail, helping turn one deflection demonstration into better-understood planetary-defence knowledge. Its goal is not to push the asteroid again.
Three tracker pages, three stories
Cruise-phase tracker positions can look like dots moving through the same solar system, yet the mission stories differ: sample a population, orbit a metal-rich target, and investigate a deflection test. Follow the numeric ephemerides for location, then use the official mission sources for instrument operations and discoveries.
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Next, read How Accurate Are Live Satellite Trackers? and How Satellite Pass Predictions Work—and What They Cannot Promise. You can also browse the most-tracked spacecraft or open the deep-space mission directory.
Authoritative sources
SpaceTracker.live is an independent educational website. Tracking and pass information is not direct spacecraft telemetry and must not be used for safety-critical navigation or spacecraft operations.