Jupiter's moons in August 2027
Io · Europa · Ganymede · Callisto — eclipses, occultations, transits, shadows, and 7 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 — every six years the moons' orbits turn edge-on to the Sun and they eclipse and occult each other. Times are for the whole Earth; pick a location and the list keeps only what your sky shows.
| When (UTC) | Event | Jupiter in your sky |
|---|---|---|
| Aug 1 13:32 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 1 14:38 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 1 17:22 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 1 17:23 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 2 11:52 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 2 12:20 UTC | Io's shadow enters the disctakes 6 min | — |
| Aug 2 14:06 UTC | Ganymede occults Europa12.3 min · 17% of Europa covered · drops ≈0.1 mag | — |
| Aug 2 14:10 UTC | Io's transit endstakes 4 min | — |
| Aug 2 14:37 UTC | Io's shadow leaves the disctakes 2 min | — |
| Aug 2 14:52 UTC | Callisto begins its transit across the disctakes 11 min | — |
| Aug 2 19:22 UTC | Callisto's shadow enters the disctakes 12 min | — |
| Aug 2 19:25 UTC | Callisto's transit endstakes 11 min | — |
| Aug 2 23:32 UTC | Callisto's shadow leaves the disctakes 13 min | — |
| Aug 3 06:44 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Aug 3 08:19 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 3 08:36 UTC | Ganymede's shadow enters the disctakes 10 min | — |
| Aug 3 09:08 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 3 09:13 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 3 10:20 UTC | Ganymede's transit endstakes 8 min | — |
| Aug 3 11:04 UTC | Ganymede eclipses Europa43.8 min · 87% of Europa covered · drops ≈2.2 mag | — |
| Aug 3 11:08 UTC | Europa's transit endstakes 4 min | — |
| Aug 3 11:51 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 3 12:00 UTC | Europa's shadow leaves the disctakes 5 min | — |
| Aug 3 12:06 UTC | Ganymede's shadow leaves the disctakes 6 min | — |
| Aug 3 12:12 UTC | Ganymede's shadow enters the disc | — |
| Aug 3 12:16 UTC | Ganymede's shadow leaves the disc | — |
| Aug 3 13:42 UTC | Ganymede occults Europa56.2 min · 100% of Europa covered · drops ≈0.5 mag | — |
| Aug 4 06:22 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 4 06:49 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 4 08:40 UTC | Io's transit endstakes 4 min | — |
| Aug 4 09:06 UTC | Io's shadow leaves the disctakes 5 min | — |
| Aug 5 02:58 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 5 03:38 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 5 06:20 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 5 06:41 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 6 00:52 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 6 01:17 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 6 03:11 UTC | Io's transit endstakes 4 min | — |
| Aug 6 03:35 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 6 20:54 UTC | Ganymede disappears behind Jupitertakes 8 min | — |
| Aug 6 21:42 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 6 22:08 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 6 22:30 UTC | Europa's shadow enters the disctakes 5 min | — |
| Aug 7 00:32 UTC | Europa's transit endstakes 4 min | — |
| Aug 7 00:49 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 7 01:17 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Aug 7 02:04 UTC | Ganymede reappears from Jupiter's shadowtakes 8 min | — |
| Aug 7 19:23 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 7 19:46 UTC | Io's shadow enters the disctakes 6 min | — |
| Aug 7 21:41 UTC | Io's transit endstakes 4 min | — |
| Aug 7 22:03 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 8 16:23 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 8 16:38 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 8 19:17 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 8 19:59 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 9 13:53 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 9 14:15 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 9 16:11 UTC | Io's transit endstakes 4 min | — |
| Aug 9 16:32 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 9 19:18 UTC | Ganymede occults Europa26.6 min · 64% of Europa covered · drops ≈0.3 mag | — |
| Aug 9 21:45 UTC | Ganymede eclipses Europa15.9 min · 4% of Europa covered · drops ≈0.0 mag | — |
| Aug 10 08:06 UTC | Ganymede eclipses Europa57.5 min · 100% of Europa covered · drops ≈7.5 mag | — |
| Aug 10 10:22 UTC | Ganymede occults Europa46.5 min · 100% of Europa covered · drops ≈0.5 mag | — |
| Aug 10 11:06 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 10 11:09 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 10 11:10 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Aug 10 11:47 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 10 12:34 UTC | Ganymede's shadow enters the disctakes 9 min | — |
| Aug 10 13:46 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 10 13:55 UTC | Europa's transit endstakes 4 min | — |
| Aug 10 14:34 UTC | Europa's shadow leaves the disctakes 5 min | — |
| Aug 10 14:46 UTC | Ganymede's transit endstakes 8 min | — |
| Aug 10 16:06 UTC | Ganymede's shadow leaves the disctakes 8 min | — |
| Aug 10 23:57 UTC | Callisto disappears behind Jupitertakes 11 min | — |
| Aug 11 07:25 UTC | Callisto reappears from Jupiter's shadowtakes 12 min | — |
| Aug 11 08:23 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 11 08:43 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 11 10:42 UTC | Io's transit endstakes 4 min | — |
| Aug 11 11:01 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 12 05:39 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 12 05:49 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 12 08:14 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 12 09:18 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 13 02:54 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 13 03:12 UTC | Io's shadow enters the disctakes 5 min | — |
| Aug 13 05:12 UTC | Io's transit endstakes 4 min | — |
| Aug 13 05:30 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 14 00:09 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 14 00:30 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 14 01:04 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 14 01:21 UTC | Ganymede disappears behind Jupitertakes 8 min | — |
| Aug 14 02:42 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 14 03:19 UTC | Europa's transit endstakes 4 min | — |
| Aug 14 03:52 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Aug 14 06:03 UTC | Ganymede reappears from Jupiter's shadowtakes 8 min | — |
| Aug 14 21:24 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 14 21:41 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 14 23:43 UTC | Io's transit endstakes 4 min | — |
| Aug 14 23:58 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 15 18:39 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 15 19:14 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 15 21:11 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 15 22:36 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 16 15:55 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 16 16:09 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 16 18:13 UTC | Io's transit endstakes 4 min | — |
| Aug 16 18:27 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 17 13:09 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 17 13:54 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 17 14:21 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 17 15:37 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Aug 17 15:39 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 17 16:33 UTC | Ganymede's shadow enters the disctakes 7 min | — |
| Aug 17 16:43 UTC | Europa's transit endstakes 4 min | — |
| Aug 17 17:09 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Aug 17 19:12 UTC | Ganymede's transit endstakes 8 min | — |
| Aug 17 20:04 UTC | Ganymede's shadow leaves the disctakes 9 min | — |
| Aug 18 10:25 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 18 10:38 UTC | Io's shadow enters the disctakes 6 min | — |
| Aug 18 12:43 UTC | Io's transit endstakes 4 min | — |
| Aug 18 12:56 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 19 07:40 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 19 08:40 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 19 10:08 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 19 11:25 UTC | Callisto begins its transit across the disctakes 11 min | — |
| Aug 19 11:54 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 19 13:22 UTC | Callisto's shadow enters the disctakes 13 min | — |
| Aug 19 15:51 UTC | Callisto's transit endstakes 11 min | — |
| Aug 19 17:30 UTC | Callisto's shadow leaves the disctakes 11 min | — |
| Aug 20 04:55 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 20 05:07 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 20 07:14 UTC | Io's transit endstakes 4 min | — |
| Aug 20 07:24 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 21 02:10 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 21 03:18 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 21 03:38 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 21 04:36 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 21 05:49 UTC | Ganymede disappears behind Jupitertakes 8 min | — |
| Aug 21 06:07 UTC | Europa's transit endstakes 4 min | — |
| Aug 21 06:26 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Aug 21 10:01 UTC | Ganymede reappears from Jupiter's shadowtakes 8 min | — |
| Aug 21 23:26 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 21 23:35 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 22 01:44 UTC | Io's transit endstakes 4 min | — |
| Aug 22 01:53 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 22 20:40 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 22 22:06 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 22 23:05 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 23 01:12 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 23 17:56 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 23 18:04 UTC | Io's shadow enters the disctakes 6 min | — |
| Aug 23 20:14 UTC | Io's transit endstakes 4 min | — |
| Aug 23 20:22 UTC | Io's shadow leaves the disctakes 2 min | — |
| Aug 24 15:10 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 24 16:42 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 24 16:55 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 24 17:33 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 24 19:30 UTC | Europa's transit endstakes 4 min | — |
| Aug 24 19:43 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Aug 24 20:04 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Aug 24 20:32 UTC | Ganymede's shadow enters the disctakes 10 min | — |
| Aug 24 23:39 UTC | Ganymede's transit endstakes 8 min | — |
| Aug 25 00:03 UTC | Ganymede's shadow leaves the disctakes 7 min | — |
| Aug 25 12:27 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 25 12:33 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 25 14:45 UTC | Io's transit endstakes 4 min | — |
| Aug 25 14:50 UTC | Io's shadow leaves the disctakes 3 min | — |
| Aug 26 09:40 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 26 11:32 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 26 12:02 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 26 14:31 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 27 06:57 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 27 07:01 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 27 09:15 UTC | Io's transit endstakes 4 min | — |
| Aug 27 09:19 UTC | Io's shadow leaves the disctakes 3 min | — |
| Aug 27 20:39 UTC | Callisto disappears behind Jupitertakes 11 min | — |
| Aug 28 01:22 UTC | Callisto reappears from Jupiter's shadowtakes 12 min | — |
| Aug 28 04:11 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 28 06:06 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 28 06:12 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 28 06:30 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 28 08:54 UTC | Europa's transit endstakes 4 min | — |
| Aug 28 09:00 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Aug 28 10:16 UTC | Ganymede disappears behind Jupitertakes 8 min | — |
| Aug 28 13:58 UTC | Ganymede reappears from Jupiter's shadowtakes 8 min | — |
| Aug 29 01:27 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 29 01:30 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 29 03:46 UTC | Io's transit endstakes 4 min | — |
| Aug 29 03:48 UTC | Io's shadow leaves the disctakes 4 min | — |
| Aug 29 22:41 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 30 00:57 UTC | Europa disappears behind Jupitertakes 4 min | — |
| Aug 30 00:59 UTC | Io reappears from Jupiter's shadowtakes 4 min | — |
| Aug 30 03:49 UTC | Europa reappears from Jupiter's shadowtakes 4 min | — |
| Aug 30 19:58 UTC | Io begins its transit across the disctakes 4 min | — |
| Aug 30 19:58 UTC | Io's shadow enters the disctakes 3 min | — |
| Aug 30 22:16 UTC | Io's transit endstakes 4 min | — |
| Aug 30 22:16 UTC | Io's shadow leaves the disctakes 3 min | — |
| Aug 31 17:11 UTC | Io disappears behind Jupitertakes 4 min | — |
| Aug 31 19:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Aug 31 19:29 UTC | Europa's shadow enters the disctakes 3 min | — |
| Aug 31 19:30 UTC | Europa begins its transit across the disctakes 4 min | — |
| Aug 31 22:17 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Aug 31 22:18 UTC | Europa's transit endstakes 4 min | — |
Reading the list
Each disappears / reappears line is the moment the moon's disc is fully in or first out; the "takes N min" is how long the disc takes to cross the edge. Halves that happen behind Jupiter or inside its shadow are left out, since nobody can see them. Positions are from JPL DE431 and the jup365 satellite ephemeris, Jupiter as an oblate spheroid with its shadow cone; mutual-event magnitude drops assume uniform discs and are estimates. Events are geocentric — the same instant everywhere on Earth to well under a second.