Jupiter: Io shadow transit

November 6, 2026 · 21:40–22:55 local · seeing 3/5, transparency 4/5

Set the scope out an hour early to cool. At 120x the belts were soft, but by 22:10 the air steadied and 200x held well.

The shadow of Io appeared as a small, very dark dot on the southern edge of the North Equatorial Belt. Io itself was hard to separate from the disk until near the limb. The Great Red Spot was not on the visible side.

Next time: try a light yellow filter for the belts, and log the exact ingress time.