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Atlas — the interactive world

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the Solar System · Understand · schematic figure · 8 planets · 5 dwarf planets · 2 belts · 1 comet · positions computed for today · editorial corpus · no live source connected

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Moon

Io

Jupiter’s innermost large moon — the most volcanically active body known, its eruptions first seen in Voyager 1’s 1979 images.

Diameter
3,643 km
Mass
0.089 ×10²⁴ kg

Values: NASA Solar System Exploration (Io) — not network-verified in this run.

Listed without a figure position: JPL small-body orbital elements were not importable in this environment, and no position is invented.

Recorded encounters

  • 1979 Voyager 1Active volcanism found on Io
  • 1979 Voyager 2Voyager 2 closest approach to Jupiter

An encounter sequence is the order the records give, not a flight path. Atlas holds no trajectory for these missions and draws none.

Data: NASA Planetary Fact Sheet · JPL approximate elements · JPL small-body database (1P/Halley).

Mission history · 1962 → now50 encounters · 19 missions · 19 bodies○ planned
Schematic · log-compressed · ranked discs · not an ephemeris — full statement →

Schematic view: distances are log-compressed (to true scale Neptune sits 30× Earth’s distance) and discs are ranked by size, not to scale. Positions computed from JPL mean orbital elements for today — an orientation good to a few degrees, not an ephemeris.

Data: NASA Planetary Fact Sheet · JPL approximate elements · JPL small-body database (1P/Halley).