Occult occultations for your city
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Jupiter's moons in September 2026

Io · Europa · Ganymede · Callisto · 43 mutual events

Jupiter's four big moons put on a show every night. They pass behind it, into its shadow and across its face, and their shadows cross its clouds. Any telescope shows it. This is a mutual-event season: the moons' orbits are edge-on to the Sun, so they eclipse and hide each other. Pick your place to see only what's visible from there.

Where the moons are

Jupiter · September 2026

Jupiter's equator horizontal, east to the left as in binoculars. Drag through the month or tap an event to jump to it. Full screen (⤢) steps through one night minute by minute. A faded moon is behind the planet; an empty ring is a moon in its shadow. Positions ±0.1 Jupiter radii, for the picture; the times come from JPL.

Events

21 events you can see from New Delhi this month, on 16 nights

Mon
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Wed
Thu
Fri
Sat
Sun
1
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61718192102
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131
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151161172181
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211
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251262272281291
30
behind the planetin its shadowcrossing its faceshadow on the planetmoons eclipse or hide each otherGreat Red Spot mid-disc

Times in IST, when the moon's centre crosses the edge, as almanacs list them. A night runs from noon to noon. Tap an event to see it in the diagram.

Night of Sun 6 Sep

  1. Europa's shadow crosses Jupiter
    02:06 enters → 04:58 leaves · 2 h 52 min
    Jupiter below the horizon

Night of Mon 7 Sep

  1. Ganymede crosses Jupiter
    01:48 enters → 05:26 leaves · 3 h 38 min
    Jupiter below the horizon

Night of Tue 8 Sep

  1. Io occults Europa
    05:18 · 4.2 min
    71% of Europa covered · ≈0.4 mag fainter · Jupiter 21° up · dusk

Night of Wed 9 Sep

  1. Great Red Spot crosses the middle of Jupiter
    04:46 · on view 03:56–05:36
    Jupiter 14° up · dark sky
  2. Io in Jupiter's shadow
    05:01 disappears → reappears unseen · 2 h 17 min
    Jupiter 18° up · dark sky

Night of Thu 10 Sep

  1. Io's shadow crosses Jupiter
    02:24 enters → 04:40 leaves · 2 h 16 min
    Jupiter below the horizon
  2. Io crosses Jupiter
    03:03 enters → 05:21 leaves · 2 h 18 min
    Jupiter below the horizon

Night of Sun 13 Sep

  1. Europa's shadow crosses Jupiter
    04:40 enters → 07:33 leaves · 2 h 53 min
    Jupiter 16° up · dark sky

Night of Tue 15 Sep

  1. Europa behind Jupiter
    disappears unseen → 04:13 reappears · 2 h 54 min
    Jupiter 11° up · dark sky

Night of Wed 16 Sep

  1. Great Red Spot crosses the middle of Jupiter
    05:35 · on view 04:45–06:25
    Jupiter 30° up · dusk

Night of Thu 17 Sep

  1. Io's shadow crosses Jupiter
    04:18 enters → 06:34 leaves · 2 h 16 min
    Jupiter 14° up · dark sky
  2. Io crosses Jupiter
    05:03 enters → 07:21 leaves · 2 h 18 min
    Jupiter 23° up · dark sky

Night of Fri 18 Sep

  1. Io behind Jupiter
    disappears unseen → 04:30 reappears · 2 h 18 min
    Jupiter 17° up · dark sky

Night of Mon 21 Sep

  1. Great Red Spot crosses the middle of Jupiter
    04:44 · on view 03:54–05:34
    Jupiter 22° up · dark sky

Night of Fri 25 Sep

  1. Ganymede behind Jupiter
    disappears unseen → 04:14 reappears · 3 h 40 min
    Jupiter 18° up · dark sky

Night of Sat 26 Sep

  1. Io crosses Jupiter
    01:32 enters → 03:50 leaves · 2 h 18 min
    Jupiter below the horizon
  2. Great Red Spot crosses the middle of Jupiter
    03:54 · on view 03:04–04:44
    Jupiter 14° up · dark sky

Night of Sun 27 Sep

  1. Europa occults Callisto
    03:58 · 7.0 min
    38% of Callisto covered · ≈0.2 mag fainter · Jupiter 16° up · dark sky
  2. Europa eclipses Io
    04:38 · 4.6 min
    47% of Io covered · ≈0.7 mag fainter · Jupiter 25° up · dark sky

Night of Mon 28 Sep

  1. Great Red Spot crosses the middle of Jupiter
    05:33 · on view 04:43–06:23
    Jupiter 37° up · dusk

Night of Tue 29 Sep

  1. Europa in Jupiter's shadow
    04:57 disappears → reappears unseen · 2 h 52 min
    Jupiter 30° up · dark sky

Reading the list

Times are when the moon's centre crosses the edge of Jupiter or its shadow, as in published tables. The whole disc takes a few minutes. A start or end marked unseen happens behind Jupiter or inside its shadow. “Only what I can see” keeps events with Jupiter more than 10° up in a dark sky. Positions: JPL DE431 and jup365, with Jupiter as a flattened globe. Mutual-event brightness drops are estimates. Each event happens at the same instant everywhere on Earth. The Great Red Spot is a storm, so its times are estimates. They are when it crosses the middle of the disc (System II, from DE431), taking 91° longitude on 1 Jun 2026 and a drift of 1.75° a month (Sky & Telescope, from the JUPOS drift record). Each degree of error shifts the time by 1.65 min. The spot is well placed for about 50 minutes either side.