OBSERVER SKY VIEW
Awaiting observer dataWhere to look
Compass projection of the current sky direction. The chart shows direction, not brightness or a photograph of the sky.
NASA/JPL HORIZONS EPHEMERIS
Where Is JUICE Now? Live Spacecraft Position
ESA · Jupiter system · Launched 2023-04-14
Jupiter’s icy moons
JUICE will investigate Jupiter and its icy moons, with Ganymede a central destination. Its cruise uses gravity assists; the distance travelled cannot be turned into a simple straight-line completion percentage.
FROM EARTH NOWWaiting for dataSample timestamp will appear here
FROM SUN NOWWaiting for dataSample timestamp will appear here
ONE-WAY RADIO DELAY—Geometric light time to Earth
TIME SINCE LAUNCH—Launch date: 2023-04-14 · calendar-day estimate
Loading current samples independently of the map date.
Radio signal simulator
Estimate a signal’s travel time from a fixed distance sample. No signal is transmitted. Spacecraft motion, processing time and station scheduling are excluded.
An ideal immediate reply takes twice the one-way light time.
Explore mission dates
Snapshots use 12:00 UTC on the selected day, not exact encounter time. Check the map timestamp and data availability. The current summary above stays independent.
Drag to rotate · Scroll/pinch to zoom · Tap a planet to focus
Solar System ViewPlanet sizes are enlarged for visibility; orbital positions use JPL ephemerides.
Loading mission ephemeris…UTC --:--:--
JUICE · FROM YOUR LOCATION
Find the spacecraft in the sky
See where the spacecraft appears in the sky for the location selected above. The chart shows direction and does not guarantee naked-eye or telescope visibility.
Waiting for your selected location…
Right ascension · ICRF—
Declination · ICRF—
Sky direction—
Above horizon—
Rise, highest point and set
Rise above horizon—
Highest altitude—
Set below horizon—
Rise, highest point and set are estimates. Atmospheric refraction and terrain are excluded.
A calculated direction does not imply optical visibility.
Distance from your location
Observer range in astronomical units. Close flybys and maneuvers can change the distance quickly.
About JUICE
The Jupiter Icy Moons Explorer is travelling to the Jupiter system to study Ganymede, Callisto and Europa.
DestinationJupiter system
Launched2023-04-14
AgencyESA
DAILY SKY POSITION
12:00 UTC sample · dates and times labeled UTCThe next 15 days
| Date (UTC) | RA (°) | Dec (°) | Azimuth (°) | Altitude (°) | Range (AU) |
|---|---|---|---|---|---|
| Select your observing location above to load the position table. | |||||
These are observer-based line-of-sight calculations, independent of the compressed scale used in the 3D voyage map. No brightness prediction is made.
TRACKER GUIDE & MISSION EXPLAINER
JUICE Tracker: Journey to Jupiter and Its Ocean-Bearing Moons
JUICE—the Jupiter Icy Moons Explorer—is an ESA mission travelling to the Jupiter system. The tracker above uses JPL Horizons vectors to present its interplanetary route, current distances, light time and velocity while it uses gravity assists to build the energy needed for the long journey.
JUICE launched on April 14, 2023 aboard an Ariane 5. ESA plans for arrival at Jupiter in 2031, followed by years of observations of Jupiter, Ganymede, Callisto and Europa.
Why the icy moons matter
Ganymede, Europa and Callisto are believed to contain deep oceans beneath icy crusts. JUICE will investigate their surfaces, interiors, magnetic environments and possible habitability. It will make multiple flybys and later become the first spacecraft to orbit a moon other than Earth's Moon when it enters orbit around Ganymede.
The mission also studies Jupiter's atmosphere, magnetosphere and the way the giant planet shapes its complex system of rings and moons.
How the position display works
JPL Horizons produces time-tagged Cartesian vectors for JUICE. The site caches a short timeline and interpolates it every second. The animation is not telemetry and the distances are too large to display at a single literal scale.
During gravity-assist phases, the path may loop near planets as momentum is exchanged. A heliocentric view explains the long cruise better than a simple straight line from Earth to Jupiter.
What students can investigate
- Why does JUICE use Earth, Moon and Venus flybys?
- How does light time grow as the mission moves farther from Earth?
- What makes an ocean world potentially habitable?
- Why will JUICE orbit Ganymede rather than land?
- How do radiation and low sunlight affect spacecraft design at Jupiter?
Limits and mission updates
The tracker does not show instrument operations, flyby targeting accuracy or spacecraft health. ESA remains the authoritative source for timeline changes and science status. The vector display is an educational representation based on the configured Horizons ephemeris.
A mission shaped by energy and radiation
Jupiter is far from the Sun, so solar power is less abundant than near Earth, yet its radiation environment is severe. JUICE uses large solar arrays and a carefully planned sequence of encounters. Ganymede is especially valuable because it is the Solar System's largest moon, has its own magnetic field and is believed to contain a deep ocean. The mission's changing Earth distance also illustrates why onboard autonomy and careful communication scheduling become increasingly important on long planetary cruises.
MISSION REFERENCE · RESEARCH & TRAJECTORY
JUICE science, Jupiter-system encounters and trajectory context
Why compare three icy moons
ESA’s Jupiter Icy Moons Explorer, Juice, was designed to investigate Ganymede, Callisto and Europa alongside Jupiter’s wider environment. The moons differ in their surfaces, interiors and interactions with Jupiter’s magnetic field. Comparing them helps scientists test ideas about where liquid-water layers may exist and what conditions might make a world habitable. Habitability is a scientific question about environments, not an announcement that life has been found. Juice’s emphasis on Ganymede complements Europa Clipper’s emphasis on Europa.
How the long route saves energy
Reaching the Jupiter system is a demanding interplanetary journey. Juice’s itinerary uses planetary gravity assists, including a lunar–Earth sequence, to gain a suitable trajectory while managing launch energy and propellant. A line on a Solar System map can look indirect because it is drawn in a moving system: the spacecraft targets future positions of planets, not where those planets appear at launch. Published encounter dates are planning milestones and should be checked against ESA mission updates as operations progress.
Instruments, radiation and communications
Remote-sensing and in-situ instruments can examine the moons’ surfaces, possible subsurface oceans, plasma and magnetic environment. Jupiter’s radiation belts place constraints on spacecraft hardware and observing plans, so the itinerary is designed around scientific goals and exposure limits. Radio signals to the outer Solar System take substantial time even at light speed. This page’s one-way light time helps explain why a distant mission cannot be steered like a drone with instantaneous controls.
How to read this tracker alongside Europa Clipper
The two missions do not have identical encounter schedules, and their markers should not be interpreted as a race to the same moon. Compare their Earth distances and heliocentric positions to understand the different cruise paths. The map is compressed to keep large separations viewable. Observer rise and set times, when available, describe calculated horizon crossings, not optical detectability. ESA’s Juice science pages remain the source for actual instrument findings; NASA’s Europa Clipper materials cover that mission’s separate science priorities.
Frequently asked questions
What does JUICE stand for?
Jupiter Icy Moons Explorer.
Which moons will it study?
Its main icy-moon targets are Ganymede, Callisto and Europa, alongside broader study of Jupiter and its environment.
When will JUICE reach Jupiter?
ESA's current mission information gives arrival in July 2031.
Is the displayed position direct telemetry?
No. It is calculated from JPL Horizons ephemerides.
Sources and further reading
Educational-use note: SpaceTracker.live is an independent educational website and is not an official mission-control service. Positions, paths, distances and pass predictions are computed from third-party orbital elements or ephemerides. They may be delayed or approximate and must not be used for navigation, collision avoidance or safety-critical decisions.