Occult occultations, computed
Location

Jupiter's moons in June 2027

Io · Europa · Ganymede · Callisto — 2 mutual events

Jupiter's four big moons put on a show every night: they slip behind the planet and into its shadow, cross its face, and drag their shadows across the cloud tops. Any telescope shows it. This is a mutual-event season — the moons' orbits are edge-on to the Sun and they eclipse and occult each other. Pick your place: the calendar and the nights keep only what your sky shows.

Where the moons are

Jupiter · June 2027

Jupiter's equator horizontal, east to the left as in binoculars. Drag through the month, or tap any event below to jump there; full screen (⤢) steps through a single night a minute at a time. Moons behind the planet fade, a moon in Jupiter's shadow is an empty ring, and a shadow on the disc is placed from the listed times. Positions ±0.1 Jupiter radii — for the picture; the times come from JPL.

Events

20 events you can see from New Delhi this month, on 14 nights

Mon
Tue
Wed
Thu
Fri
Sat
Sun
12
2
314151
6
718291101
11
12
13
142151
16
171
18
19
20
212
22
232242
25
26
27
28
29
30
behind the planetin its shadowcrossing its faceshadow on the planetmoons eclipse or hide each other

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 Tue 1 Jun

  1. Io crosses Jupiter
    17:52 enters → 20:11 leaves · 2 h 18 min
    Jupiter 74° up · daylight
  2. Io's shadow crosses Jupiter
    19:05 enters → 21:21 leaves · 2 h 16 min
    Jupiter 61° up · daylight

Night of Thu 3 Jun

  1. Ganymede in Jupiter's shadow
    16:17 disappears → 19:50 reappears · 3 h 34 min
    Jupiter 73° up · daylight

Night of Fri 4 Jun

  1. Callisto behind Jupiter
    21:14 disappears → 02:03 reappears · 4 h 49 min
    Jupiter 31° up · dark sky

Night of Sat 5 Jun

  1. Europa behind Jupiter
    20:41 disappears → reappears unseen · 2 h 54 min
    Jupiter 37° up · dark sky

Night of Mon 7 Jun

  1. Europa's shadow crosses Jupiter
    18:09 enters → 20:55 leaves · 2 h 47 min
    Jupiter 68° up · daylight

Night of Tue 8 Jun

  1. Io crosses Jupiter
    19:51 enters → 22:09 leaves · 2 h 18 min
    Jupiter 46° up · dusk
  2. Io's shadow crosses Jupiter
    21:00 enters → 23:15 leaves · 2 h 15 min
    Jupiter 31° up · dark sky

Night of Wed 9 Jun

  1. Io in Jupiter's shadow
    disappears unseen → 20:37 reappears · 2 h 17 min
    Jupiter 35° up · dark sky

Night of Thu 10 Jun

  1. Ganymede in Jupiter's shadow
    20:16 disappears → 23:49 reappears · 3 h 33 min
    Jupiter 39° up · dusk

Night of Mon 14 Jun

  1. Europa crosses Jupiter
    18:31 enters → 21:22 leaves · 2 h 51 min
    Jupiter 59° up · daylight
  2. Europa's shadow crosses Jupiter
    20:42 enters → 23:29 leaves · 2 h 46 min
    Jupiter 30° up · dark sky

Night of Tue 15 Jun

  1. Io crosses Jupiter
    21:50 enters → 00:08 leaves · 2 h 18 min
    Jupiter 15° up · dark sky

Night of Thu 17 Jun

  1. Ganymede behind Jupiter
    19:52 disappears → 23:32 reappears · 3 h 40 min
    Jupiter 39° up · dusk

Night of Mon 21 Jun

  1. Callisto behind Jupiter
    16:42 disappears → 21:29 reappears · 4 h 47 min
    Jupiter 74° up · daylight
  2. Europa crosses Jupiter
    21:15 enters → 00:06 leaves · 2 h 51 min
    Jupiter 18° up · dark sky

Night of Wed 23 Jun

  1. Europa in Jupiter's shadow
    disappears unseen → 20:29 reappears · 2 h 50 min
    Jupiter 26° up · dark sky
  2. Io behind Jupiter
    21:09 disappears → reappears unseen · 2 h 18 min
    Jupiter 18° up · dark sky

Night of Thu 24 Jun

  1. Io crosses Jupiter
    18:19 enters → 20:37 leaves · 2 h 18 min
    Jupiter 54° up · daylight
  2. Io's shadow crosses Jupiter
    19:19 enters → 21:36 leaves · 2 h 17 min
    Jupiter 41° up · twilight

Reading the list

Times are for the moment the moon's centre crosses the edge of Jupiter or of its shadow, the convention of published tables; the moon's own disc takes a few minutes to cross. 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 are from JPL DE431 and the jup365 satellite ephemeris, Jupiter as an oblate spheroid with its shadow cone. Mutual-event brightness drops assume uniform discs and are estimates. Events are geocentric — the same instant everywhere on Earth to well under a second.