Space

APOD: 2026 October 28 – The Mutual Occultation of Ganymede and Io

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 28/10/2026, 04:50:24 UTC.

Briefings

On October 20, 2026, Ganymede and Io, two of Jupiter's Galilean moons, performed a mutual occultation where Ganymede briefly blocked Io from view. This rare event occurred because Earth's edge-on view of their orbits aligned with Jupiter's equinox, making the event visible only from space. Ganymede cast its shadow on Jupiter's right side, creating a potential solar eclipse for any fictional Jovian species within that shadow. The event is rare because it requires a specific orbital alignment and Jupiter's equinox position.

Key points

• Ganymede and Io performed a mutual occultation on October 20, 2026, where Ganymede briefly blocked Io from view.
• The event occurred because Earth's edge-on view of their orbits aligned with Jupiter's equinox, making the event visible only from space.

Context

This event is a rare astronomical occurrence where Ganymede and Io, two of Jupiter's Galilean moons, met in the sky on October 20, 2026. The event is visible only from space because it requires Earth's edge-on view of their orbits to align with Jupiter's equinox.

Limitations

Evidence is limited to the APOD article text which describes the event as a 'brief' occultation. No specific duration, angular size, or visibility statistics are provided in the source.

Generated by Bittrees-hosted qwen35-2b sha256:aaf42c8b7c3c on 28/10/2026, 05:06:06 UTC. Based on publisher-provided feed evidence; may not cover the full original article. Check the source for details.

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