Jupiter's moons in October 2027
Io · Europa · Ganymede · Callisto — eclipses, occultations, transits, shadows
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. 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 |
|---|---|---|
| Oct 1 00:45 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 1 04:34 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 1 16:32 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 1 17:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 1 18:50 UTC | Io's shadow leaves the disctakes 4 min | — |
| Oct 1 19:20 UTC | Io's transit endstakes 4 min | — |
| Oct 2 13:42 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 2 16:30 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 2 19:02 UTC | Europa's shadow enters the disctakes 5 min | — |
| Oct 2 20:04 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 2 21:49 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 2 22:51 UTC | Europa's transit endstakes 4 min | — |
| Oct 3 06:22 UTC | Ganymede disappears into Jupiter's shadowtakes 9 min | — |
| Oct 3 11:01 UTC | Io's shadow enters the disctakes 7 min | — |
| Oct 3 11:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 3 11:59 UTC | Ganymede reappears from behind Jupitertakes 9 min | — |
| Oct 3 13:18 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 3 13:50 UTC | Io's transit endstakes 4 min | — |
| Oct 4 08:11 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 4 11:00 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 4 14:03 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 4 17:58 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 5 05:29 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 5 06:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 5 07:47 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 5 08:21 UTC | Io's transit endstakes 4 min | — |
| Oct 6 02:39 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 6 05:30 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 6 08:19 UTC | Europa's shadow enters the disctakes 7 min | — |
| Oct 6 09:28 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 6 11:06 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 6 12:14 UTC | Europa's transit endstakes 4 min | — |
| Oct 6 20:23 UTC | Ganymede's shadow enters the disctakes 13 min | — |
| Oct 6 22:45 UTC | Ganymede begins its transit across the disctakes 9 min | — |
| Oct 6 23:50 UTC | Ganymede's shadow leaves the disctakes 8 min | — |
| Oct 6 23:58 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 7 00:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 7 02:12 UTC | Ganymede's transit endstakes 9 min | — |
| Oct 7 02:15 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 7 02:51 UTC | Io's transit endstakes 4 min | — |
| Oct 7 21:07 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 8 00:00 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 8 03:21 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 8 07:23 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 8 18:26 UTC | Io's shadow enters the disctakes 7 min | — |
| Oct 8 19:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 8 19:21 UTC | Callisto's shadow enters the disctakes 17 min | — |
| Oct 8 20:44 UTC | Io's shadow leaves the disctakes 4 min | — |
| Oct 8 21:21 UTC | Io's transit endstakes 4 min | — |
| Oct 8 23:12 UTC | Callisto's shadow leaves the disctakes 11 min | — |
| Oct 9 01:09 UTC | Callisto begins its transit across the disctakes 13 min | — |
| Oct 9 04:57 UTC | Callisto's transit endstakes 13 min | — |
| Oct 9 15:36 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 9 18:30 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 9 21:36 UTC | Europa's shadow enters the disctakes 8 min | — |
| Oct 9 22:51 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 10 00:22 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 10 01:37 UTC | Europa's transit endstakes 4 min | — |
| Oct 10 10:20 UTC | Ganymede disappears into Jupiter's shadowtakes 9 min | — |
| Oct 10 12:55 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 10 13:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 10 15:12 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 10 15:51 UTC | Io's transit endstakes 4 min | — |
| Oct 10 16:22 UTC | Ganymede reappears from behind Jupitertakes 9 min | — |
| Oct 11 10:04 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 11 13:00 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 11 16:39 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 11 20:46 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 12 07:23 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 12 08:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 12 09:41 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 12 10:21 UTC | Io's transit endstakes 4 min | — |
| Oct 13 04:32 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 13 07:29 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 13 10:53 UTC | Europa's shadow enters the disctakes 5 min | — |
| Oct 13 12:14 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 13 13:39 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 13 15:00 UTC | Europa's transit endstakes 4 min | — |
| Oct 14 00:21 UTC | Ganymede's shadow enters the disc | — |
| Oct 14 00:25 UTC | Ganymede's shadow leaves the disc | — |
| Oct 14 00:26 UTC | Ganymede's shadow enters the disctakes 8 min | — |
| Oct 14 01:54 UTC | Io's shadow enters the disctakes 3 min | — |
| Oct 14 02:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 14 03:09 UTC | Ganymede begins its transit across the disctakes 9 min | — |
| Oct 14 03:48 UTC | Ganymede's shadow leaves the disctakes 8 min | — |
| Oct 14 04:09 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 14 04:50 UTC | Io's transit endstakes 4 min | — |
| Oct 14 06:34 UTC | Ganymede's transit endstakes 9 min | — |
| Oct 14 23:01 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 15 01:59 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 15 05:57 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 15 10:10 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 15 20:20 UTC | Io's shadow enters the disctakes 7 min | — |
| Oct 15 21:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 15 22:38 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 15 23:20 UTC | Io's transit endstakes 4 min | — |
| Oct 16 17:29 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 16 20:29 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 17 00:12 UTC | Europa's shadow enters the disctakes 6 min | — |
| Oct 17 01:37 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 17 02:56 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Oct 17 03:27 UTC | Callisto disappears into Jupiter's shadowtakes 13 min | — |
| Oct 17 04:23 UTC | Europa's transit endstakes 4 min | — |
| Oct 17 07:07 UTC | Callisto reappears from Jupiter's shadowtakes 13 min | — |
| Oct 17 10:32 UTC | Callisto disappears behind Jupitertakes 14 min | — |
| Oct 17 14:13 UTC | Callisto reappears from behind Jupitertakes 14 min | — |
| Oct 17 14:18 UTC | Ganymede disappears into Jupiter's shadowtakes 9 min | — |
| Oct 17 14:49 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 17 15:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 17 17:06 UTC | Io's shadow leaves the disctakes 4 min | — |
| Oct 17 17:50 UTC | Io's transit endstakes 4 min | — |
| Oct 17 20:43 UTC | Ganymede reappears from behind Jupitertakes 9 min | — |
| Oct 18 11:57 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 18 14:59 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 18 19:15 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 18 23:33 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 19 09:17 UTC | Io's shadow enters the disctakes 5 min | — |
| Oct 19 10:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 19 11:34 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 19 12:20 UTC | Io's transit endstakes 4 min | — |
| Oct 20 06:26 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 20 09:29 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 20 13:26 UTC | Europa's shadow enters the disctakes 6 min | — |
| Oct 20 15:00 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 20 16:13 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 20 17:46 UTC | Europa's transit endstakes 4 min | — |
| Oct 21 03:48 UTC | Io's shadow enters the disctakes 3 min | — |
| Oct 21 04:19 UTC | Ganymede's shadow enters the disctakes 14 min | — |
| Oct 21 04:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 21 06:03 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 21 06:50 UTC | Io's transit endstakes 4 min | — |
| Oct 21 07:33 UTC | Ganymede begins its transit across the disctakes 9 min | — |
| Oct 21 07:46 UTC | Ganymede's shadow leaves the disctakes 8 min | — |
| Oct 21 10:55 UTC | Ganymede's transit endstakes 9 min | — |
| Oct 22 00:54 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 22 03:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 22 08:33 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 22 12:57 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 22 22:14 UTC | Io's shadow enters the disctakes 8 min | — |
| Oct 22 23:03 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 23 00:31 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 23 01:20 UTC | Io's transit endstakes 4 min | — |
| Oct 23 19:22 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 23 22:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 24 02:46 UTC | Europa's shadow enters the disctakes 6 min | — |
| Oct 24 04:23 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 24 05:30 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Oct 24 07:08 UTC | Europa's transit endstakes 4 min | — |
| Oct 24 16:42 UTC | Io's shadow enters the disctakes 6 min | — |
| Oct 24 17:33 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 24 18:15 UTC | Ganymede disappears into Jupiter's shadowtakes 9 min | — |
| Oct 24 19:00 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 24 19:49 UTC | Io's transit endstakes 4 min | — |
| Oct 24 21:38 UTC | Ganymede reappears from Jupiter's shadowtakes 9 min | — |
| Oct 24 21:40 UTC | Ganymede disappears behind Jupitertakes 9 min | — |
| Oct 25 01:03 UTC | Ganymede reappears from behind Jupitertakes 9 min | — |
| Oct 25 13:19 UTC | Callisto's shadow enters the disctakes 20 min | — |
| Oct 25 13:51 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 25 16:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 25 17:04 UTC | Callisto's shadow leaves the disctakes 12 min | — |
| Oct 25 21:23 UTC | Callisto begins its transit across the disctakes 14 min | — |
| Oct 25 21:50 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 26 00:52 UTC | Callisto's transit endstakes 14 min | — |
| Oct 26 02:19 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 26 11:11 UTC | Io's shadow enters the disctakes 6 min | — |
| Oct 26 12:02 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 26 13:28 UTC | Io's shadow leaves the disctakes 4 min | — |
| Oct 26 14:19 UTC | Io's transit endstakes 4 min | — |
| Oct 27 08:19 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 27 11:27 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 27 16:00 UTC | Europa's shadow enters the disctakes 6 min | — |
| Oct 27 17:46 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 27 18:47 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Oct 27 20:31 UTC | Europa's transit endstakes 4 min | — |
| Oct 28 05:39 UTC | Io's shadow enters the disctakes 6 min | — |
| Oct 28 06:32 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 28 07:56 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 28 08:17 UTC | Ganymede's shadow enters the disctakes 14 min | — |
| Oct 28 08:49 UTC | Io's transit endstakes 4 min | — |
| Oct 28 11:44 UTC | Ganymede's shadow leaves the disctakes 7 min | — |
| Oct 28 11:53 UTC | Ganymede begins its transit across the disctakes 9 min | — |
| Oct 28 15:14 UTC | Ganymede's transit endstakes 9 min | — |
| Oct 29 02:47 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 29 05:57 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 29 11:08 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Oct 29 15:42 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Oct 30 00:10 UTC | Io's shadow enters the disctakes 6 min | — |
| Oct 30 01:02 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 30 02:25 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 30 03:18 UTC | Io's transit endstakes 4 min | — |
| Oct 30 21:16 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Oct 31 00:27 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Oct 31 05:20 UTC | Europa's shadow enters the disctakes 5 min | — |
| Oct 31 07:08 UTC | Europa begins its transit across the disctakes 4 min | — |
| Oct 31 08:04 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Oct 31 09:53 UTC | Europa's transit endstakes 4 min | — |
| Oct 31 18:36 UTC | Io's shadow enters the disctakes 6 min | — |
| Oct 31 19:32 UTC | Io begins its transit across the disctakes 4 min | — |
| Oct 31 20:53 UTC | Io's shadow leaves the disctakes 3 min | — |
| Oct 31 21:48 UTC | Io's transit endstakes 4 min | — |
| Oct 31 22:13 UTC | Ganymede disappears into Jupiter's shadowtakes 9 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.