Space Time logo Space Time
Spacecraft · evidence and sources

Lucy

NASA mission on a 12-year tour to visit multiple Trojan asteroids.

JPL Horizons · to Dec 2032 Trajectory basis, the same label the app shows on the selection card.

Open in Space Time

Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented
Trajectory Catalog

Trajectory from Horizons state vectors

Lucy's position is interpolated between 1,480 heliocentric state-vector samples from JPL Horizons that run through 2032-12-18. Past the last sample the marker holds its final position.

SourceJPL Horizons · record lucy
Epoch2021-10-17 to 2032-12-18
MethodJ2000 equatorial, Sun-centred position samples loaded from a versioned Blob snapshot. Historical encounter samples are preserved; active mission windows are refreshed daily by Trigger.dev in UTC. The app interpolates linearly between adjacent samples.
UncertaintyAccuracy depends on the mission ephemeris and prediction horizon. Linear interpolation adds error that grows with sample spacing (hours in the current window, finer around historical flybys). No trajectory covariance is stored.
LimitPosition only. Spacecraft attitude (which way it points) is not modelled, and no covariance is stored.
Physical data Catalog

Bulk properties

Lucy: mass 1.550 × 10^3 kg. These values are bundled with the object record and drive the rendered size.

SourceJPL Horizons
Description Undocumented

Description and facts

The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.

SourceSpace Time editorial text
LimitBackground reading is linked under Further reading; it is not the source of the displayed numbers.

Trajectory coverage: 2021-10-17 to 2032-12-18 (1,480 samples). Outside that window the marker holds its last known position.

What is not measured

Nothing on this page is a reconstruction or a schematic; every record above is observed, catalogued or computed.

Not yet documented

  • Appearance: no record. Space Time does not claim a source for this aspect.
  • Description: Background reading is linked under Further reading; it is not the source of the displayed numbers.

Dataset freshness

Snapshots this page depends on, read from the generated manifests at request time.
DatasetBundle updatedHorizonAutomated
Spacecraft trajectories (Blob snapshots)
JPL Horizons
Source retrieved:
Per craft: each evidence page states the first and last sample date Yes, daily (Trigger.dev)
Trigger.dev → private Blob snapshots; preserved historical encounter samples
Last successful check: 23 October 2026 · success

Sources cited

Further reading

Wikipedia: Lucy (background only; not the source of the displayed numbers)

More

All evidence pages Sky events and alert sources What's new All features
Space Time is a free 3D universe explorer by Point Dynamics. Origins: how to read these pages.