Occult lunar occultations, computed
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Jupiter's moons in December 2026

Io · Europa · Ganymede · Callisto — eclipses, occultations, transits, shadows, and 41 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)EventJupiter in your sky
Dec 1 03:36 UTCEuropa's shadow enters the disctakes 10 min—
Dec 1 06:07 UTCEuropa begins its transit across the disctakes 4 min—
Dec 1 06:31 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 1 06:36 UTCIo's shadow enters the disctakes 4 min—
Dec 1 07:46 UTCIo begins its transit across the disctakes 4 min—
Dec 1 08:51 UTCIo's shadow leaves the disctakes 3 min—
Dec 1 09:00 UTCEuropa's transit endstakes 4 min—
Dec 1 10:03 UTCIo's transit endstakes 4 min—
Dec 2 03:44 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 2 07:17 UTCIo reappears from behind Jupitertakes 4 min—
Dec 2 10:46 UTCGanymede eclipses Io3.8 min · 11% of Io covered · drops ≈0.1 mag—
Dec 2 17:13 UTCGanymede's shadow enters the disc—
Dec 2 17:17 UTCGanymede's shadow leaves the disc—
Dec 2 17:19 UTCGanymede's shadow enters the disctakes 11 min—
Dec 2 20:45 UTCCallisto disappears into Jupiter's shadowtakes 10 min—
Dec 2 20:47 UTCGanymede eclipses Callisto8.8 min · 100% of Callisto covered · drops ≈5.7 mag—
Dec 2 20:53 UTCGanymede's shadow leaves the disctakes 7 min—
Dec 2 21:45 UTCGanymede eclipses Europa5.1 min · 68% of Europa covered · drops ≈1.2 mag—
Dec 2 22:08 UTCGanymede begins its transit across the disctakes 8 min—
Dec 2 22:27 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 3 00:43 UTCEuropa eclipses Callisto18.4 min · 18% of Callisto covered · drops ≈0.2 mag—
Dec 3 01:04 UTCIo's shadow enters the disctakes 4 min—
Dec 3 01:12 UTCIo eclipses Callisto5.2 min · 32% of Callisto covered · drops ≈0.4 mag—
Dec 3 01:31 UTCCallisto reappears from Jupiter's shadowtakes 10 min—
Dec 3 01:46 UTCGanymede's transit endstakes 8 min—
Dec 3 02:14 UTCIo begins its transit across the disctakes 4 min—
Dec 3 03:19 UTCIo's shadow leaves the disctakes 3 min—
Dec 3 03:42 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 3 04:31 UTCIo's transit endstakes 4 min—
Dec 3 08:23 UTCCallisto disappears behind Jupitertakes 10 min—
Dec 3 13:09 UTCCallisto reappears from behind Jupitertakes 10 min—
Dec 3 22:13 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 3 22:21 UTCEuropa eclipses Callisto14.5 min · 42% of Callisto covered · drops ≈0.6 mag—
Dec 4 01:44 UTCIo reappears from behind Jupitertakes 4 min—
Dec 4 16:57 UTCEuropa's shadow enters the disctakes 7 min—
Dec 4 19:22 UTCEuropa begins its transit across the disctakes 4 min—
Dec 4 19:32 UTCIo's shadow enters the disctakes 4 min—
Dec 4 19:49 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 4 20:41 UTCIo begins its transit across the disctakes 4 min—
Dec 4 21:47 UTCIo's shadow leaves the disctakes 3 min—
Dec 4 22:16 UTCEuropa's transit endstakes 4 min—
Dec 4 22:59 UTCIo's transit endstakes 4 min—
Dec 5 14:21 UTCEuropa eclipses Ganymede9.7 min · 10% of Ganymede covered · drops ≈0.1 mag—
Dec 5 16:41 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 5 19:09 UTCEuropa occults Ganymede17.8 min · 33% of Ganymede covered · drops ≈0.3 mag—
Dec 5 20:12 UTCIo reappears from behind Jupitertakes 4 min—
Dec 6 07:06 UTCGanymede disappears into Jupiter's shadowtakes 8 min—
Dec 6 10:44 UTCGanymede reappears from Jupiter's shadowtakes 8 min—
Dec 6 11:43 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 6 11:58 UTCGanymede disappears behind Jupitertakes 8 min—
Dec 6 12:43 UTCIo eclipses Ganymede4.3 min · 16% of Ganymede covered · drops ≈0.2 mag—
Dec 6 14:00 UTCIo's shadow enters the disctakes 4 min—
Dec 6 15:09 UTCIo begins its transit across the disctakes 4 min—
Dec 6 15:37 UTCGanymede reappears from behind Jupitertakes 8 min—
Dec 6 16:15 UTCIo's shadow leaves the disctakes 3 min—
Dec 6 16:56 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 6 17:26 UTCIo's transit endstakes 4 min—
Dec 6 21:51 UTCEuropa occults Ganymede75.8 min · 32% of Ganymede covered · drops ≈0.2 mag—
Dec 7 04:57 UTCEuropa occults Ganymede55.4 min · 18% of Ganymede covered · drops ≈0.1 mag—
Dec 7 11:09 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 7 14:40 UTCIo reappears from behind Jupitertakes 4 min—
Dec 8 06:12 UTCEuropa's shadow enters the disctakes 10 min—
Dec 8 08:28 UTCIo's shadow enters the disctakes 4 min—
Dec 8 08:38 UTCEuropa begins its transit across the disctakes 4 min—
Dec 8 09:07 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 8 09:36 UTCIo begins its transit across the disctakes 4 min—
Dec 8 10:44 UTCIo's shadow leaves the disctakes 3 min—
Dec 8 11:31 UTCEuropa's transit endstakes 4 min—
Dec 8 11:54 UTCIo's transit endstakes 4 min—
Dec 9 05:38 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 9 09:07 UTCIo reappears from behind Jupitertakes 4 min—
Dec 9 13:41 UTCGanymede eclipses Io5.7 min · 31% of Io covered · drops ≈0.4 mag—
Dec 9 21:10 UTCGanymede's shadow enters the disc—
Dec 9 21:14 UTCGanymede's shadow leaves the disc—
Dec 9 21:16 UTCGanymede's shadow enters the disctakes 9 min—
Dec 10 00:50 UTCGanymede's shadow leaves the disctakes 8 min—
Dec 10 00:55 UTCGanymede eclipses Europa4.2 min · 36% of Europa covered · drops ≈0.5 mag—
Dec 10 01:00 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 10 01:54 UTCGanymede begins its transit across the disctakes 8 min—
Dec 10 02:54 UTCIo's shadow enters the disctakes 7 min—
Dec 10 04:04 UTCIo begins its transit across the disctakes 4 min—
Dec 10 05:12 UTCIo's shadow leaves the disctakes 3 min—
Dec 10 05:31 UTCGanymede's transit endstakes 8 min—
Dec 10 06:09 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 10 06:21 UTCIo's transit endstakes 4 min—
Dec 10 07:43 UTCGanymede occults Io14.0 min · 8% of Io covered · drops ≈0.0 mag—
Dec 11 00:06 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 11 03:35 UTCIo reappears from behind Jupitertakes 4 min—
Dec 11 04:02 UTCCallisto eclipses Io2.7 min · 5% of Io covered · drops ≈0.1 mag—
Dec 11 07:13 UTCCallisto's shadow enters the disc—
Dec 11 07:16 UTCCallisto's shadow leaves the disc—
Dec 11 07:20 UTCCallisto's shadow enters the disctakes 12 min—
Dec 11 12:04 UTCCallisto's shadow leaves the disctakes 8 min—
Dec 11 18:08 UTCCallisto begins its transit across the disctakes 10 min—
Dec 11 19:32 UTCEuropa's shadow enters the disctakes 4 min—
Dec 11 21:22 UTCIo's shadow enters the disctakes 7 min—
Dec 11 21:52 UTCEuropa begins its transit across the disctakes 4 min—
Dec 11 22:25 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 11 22:31 UTCIo begins its transit across the disctakes 4 min—
Dec 11 22:47 UTCCallisto's transit endstakes 10 min—
Dec 11 23:40 UTCIo's shadow leaves the disctakes 4 min—
Dec 12 00:45 UTCEuropa's transit endstakes 4 min—
Dec 12 00:48 UTCIo's transit endstakes 4 min—
Dec 12 13:36 UTCCallisto eclipses Ganymede9.5 min · 29% of Ganymede covered · drops ≈0.4 mag—
Dec 12 18:13 UTCEuropa eclipses Ganymede10.8 min · 9% of Ganymede covered · drops ≈0.1 mag—
Dec 12 18:35 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 12 22:02 UTCIo reappears from behind Jupitertakes 4 min—
Dec 12 23:14 UTCEuropa occults Ganymede23.5 min · 35% of Ganymede covered · drops ≈0.3 mag—
Dec 13 11:05 UTCGanymede disappears into Jupiter's shadowtakes 8 min—
Dec 13 14:16 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 13 14:42 UTCGanymede reappears from Jupiter's shadowtakes 8 min—
Dec 13 15:25 UTCIo eclipses Ganymede4.7 min · 28% of Ganymede covered · drops ≈0.4 mag—
Dec 13 15:42 UTCGanymede disappears behind Jupitertakes 8 min—
Dec 13 15:50 UTCIo's shadow enters the disctakes 7 min—
Dec 13 16:58 UTCIo begins its transit across the disctakes 4 min—
Dec 13 18:08 UTCIo's shadow leaves the disctakes 3 min—
Dec 13 19:04 UTCEuropa occults Ganymede30.5 min · 8% of Ganymede covered · drops ≈0.1 mag—
Dec 13 19:16 UTCIo's transit endstakes 4 min—
Dec 13 19:21 UTCGanymede reappears from behind Jupitertakes 8 min—
Dec 13 19:21 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 14 13:03 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 14 16:30 UTCIo reappears from behind Jupitertakes 4 min—
Dec 15 08:51 UTCEuropa's shadow enters the disctakes 7 min—
Dec 15 10:19 UTCIo's shadow enters the disctakes 9 min—
Dec 15 11:06 UTCEuropa begins its transit across the disctakes 4 min—
Dec 15 11:25 UTCIo begins its transit across the disctakes 4 min—
Dec 15 11:43 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 15 12:37 UTCIo's shadow leaves the disctakes 3 min—
Dec 15 13:43 UTCIo's transit endstakes 4 min—
Dec 15 13:59 UTCEuropa's transit endstakes 4 min—
Dec 16 07:31 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 16 10:57 UTCIo reappears from behind Jupitertakes 4 min—
Dec 16 16:44 UTCGanymede eclipses Io7.7 min · 52% of Io covered · drops ≈0.8 mag—
Dec 17 01:08 UTCGanymede's shadow enters the disctakes 16 min—
Dec 17 03:33 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 17 04:06 UTCGanymede eclipses Europa2.6 min · 8% of Europa covered · drops ≈0.1 mag—
Dec 17 04:48 UTCGanymede's shadow leaves the disctakes 7 min—
Dec 17 04:50 UTCIo's shadow enters the disctakes 6 min—
Dec 17 05:35 UTCGanymede begins its transit across the disctakes 8 min—
Dec 17 05:53 UTCIo begins its transit across the disctakes 4 min—
Dec 17 06:15 UTCGanymede occults Io13.1 min · 12% of Io covered · drops ≈0.1 mag—
Dec 17 07:05 UTCIo's shadow leaves the disctakes 3 min—
Dec 17 08:10 UTCIo's transit endstakes 4 min—
Dec 17 08:34 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 17 09:12 UTCGanymede's transit endstakes 8 min—
Dec 18 02:00 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 18 05:24 UTCIo reappears from behind Jupitertakes 4 min—
Dec 18 22:08 UTCEuropa's shadow enters the disctakes 4 min—
Dec 18 23:18 UTCIo's shadow enters the disctakes 6 min—
Dec 19 00:19 UTCEuropa begins its transit across the disctakes 4 min—
Dec 19 00:20 UTCIo begins its transit across the disctakes 4 min—
Dec 19 01:01 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 19 01:33 UTCIo's shadow leaves the disctakes 3 min—
Dec 19 02:37 UTCIo's transit endstakes 4 min—
Dec 19 03:12 UTCEuropa's transit endstakes 4 min—
Dec 19 14:44 UTCCallisto disappears into Jupiter's shadowtakes 10 min—
Dec 19 19:30 UTCCallisto reappears from Jupiter's shadowtakes 10 min—
Dec 19 20:28 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 19 22:18 UTCEuropa eclipses Ganymede11.8 min · 6% of Ganymede covered · drops ≈0.1 mag—
Dec 19 23:51 UTCIo reappears from behind Jupitertakes 4 min—
Dec 20 00:59 UTCCallisto disappears behind Jupitertakes 10 min—
Dec 20 02:06 UTCIo eclipses Callisto14.6 min · 6% of Callisto covered · drops ≈0.1 mag—
Dec 20 03:46 UTCEuropa occults Ganymede35.4 min · 35% of Ganymede covered · drops ≈0.3 mag—
Dec 20 05:41 UTCCallisto reappears from behind Jupitertakes 10 min—
Dec 20 07:33 UTCIo eclipses Callisto17.0 min · 18% of Callisto covered · drops ≈0.2 mag—
Dec 20 15:03 UTCGanymede disappears into Jupiter's shadowtakes 8 min—
Dec 20 16:49 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 20 16:56 UTCEuropa occults Ganymede22.9 min · 2% of Ganymede covered · drops ≈0.0 mag—
Dec 20 17:46 UTCIo's shadow enters the disctakes 4 min—
Dec 20 18:06 UTCIo eclipses Ganymede5.0 min · 29% of Ganymede covered · drops ≈0.4 mag—
Dec 20 18:40 UTCGanymede reappears from Jupiter's shadowtakes 8 min—
Dec 20 18:47 UTCIo begins its transit across the disctakes 4 min—
Dec 20 19:21 UTCGanymede disappears behind Jupitertakes 8 min—
Dec 20 20:01 UTCIo's shadow leaves the disctakes 3 min—
Dec 20 21:04 UTCIo's transit endstakes 4 min—
Dec 20 21:45 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 20 23:00 UTCGanymede reappears from behind Jupitertakes 8 min—
Dec 21 09:04 UTCEuropa eclipses Ganymede41.8 min · 26% of Ganymede covered · drops ≈0.3 mag—
Dec 21 14:57 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 21 18:19 UTCIo reappears from behind Jupitertakes 4 min—
Dec 22 11:27 UTCEuropa's shadow enters the disctakes 3 min—
Dec 22 12:14 UTCIo's shadow enters the disctakes 4 min—
Dec 22 13:14 UTCIo begins its transit across the disctakes 4 min—
Dec 22 13:32 UTCEuropa begins its transit across the disctakes 4 min—
Dec 22 14:19 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 22 14:30 UTCIo's shadow leaves the disctakes 3 min—
Dec 22 15:31 UTCIo's transit endstakes 4 min—
Dec 22 16:25 UTCEuropa's transit endstakes 4 min—
Dec 23 09:25 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 23 12:46 UTCIo reappears from behind Jupitertakes 4 min—
Dec 23 20:01 UTCGanymede eclipses Io10.6 min · 70% of Io covered · drops ≈1.3 mag—
Dec 24 04:07 UTCGanymede occults Io21.9 min · 6% of Io covered · drops ≈0.0 mag—
Dec 24 05:06 UTCGanymede's shadow enters the disc—
Dec 24 05:10 UTCGanymede's shadow leaves the disc—
Dec 24 05:12 UTCGanymede's shadow enters the disctakes 10 min—
Dec 24 06:06 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 24 06:40 UTCIo's shadow enters the disctakes 6 min—
Dec 24 07:40 UTCIo begins its transit across the disctakes 4 min—
Dec 24 08:46 UTCGanymede's shadow leaves the disctakes 7 min—
Dec 24 08:58 UTCIo's shadow leaves the disctakes 4 min—
Dec 24 09:06 UTCGanymede eclipses Io23.6 min · 97% of Io covered · drops ≈3.8 mag—
Dec 24 09:12 UTCGanymede begins its transit across the disctakes 8 min—
Dec 24 09:58 UTCIo's transit endstakes 4 min—
Dec 24 10:56 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 24 12:49 UTCGanymede's transit endstakes 8 min—
Dec 24 17:52 UTCGanymede eclipses Io16.5 min · 100% of Io covered · drops ≈7.5 mag—
Dec 25 03:54 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 25 07:13 UTCIo reappears from behind Jupitertakes 4 min—
Dec 26 00:44 UTCEuropa's shadow enters the disctakes 6 min—
Dec 26 01:08 UTCIo's shadow enters the disctakes 6 min—
Dec 26 02:07 UTCIo begins its transit across the disctakes 4 min—
Dec 26 02:43 UTCEuropa begins its transit across the disctakes 4 min—
Dec 26 03:26 UTCIo's shadow leaves the disctakes 3 min—
Dec 26 03:37 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 26 04:25 UTCIo's transit endstakes 4 min—
Dec 26 05:36 UTCEuropa's transit endstakes 4 min—
Dec 26 22:22 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 27 01:40 UTCIo reappears from behind Jupitertakes 4 min—
Dec 27 02:50 UTCEuropa eclipses Ganymede11.2 min · 2% of Ganymede covered · drops ≈0.0 mag—
Dec 27 11:03 UTCEuropa occults Ganymede107.1 min · 4% of Ganymede covered · drops ≈0.0 mag—
Dec 27 19:01 UTCGanymede disappears into Jupiter's shadowtakes 8 min—
Dec 27 19:22 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 27 19:37 UTCIo's shadow enters the disctakes 6 min—
Dec 27 20:34 UTCIo begins its transit across the disctakes 4 min—
Dec 27 20:47 UTCIo eclipses Ganymede5.2 min · 48% of Ganymede covered · drops ≈0.7 mag—
Dec 27 21:54 UTCIo's shadow leaves the disctakes 3 min—
Dec 27 22:38 UTCGanymede reappears from Jupiter's shadowtakes 8 min—
Dec 27 22:51 UTCIo's transit endstakes 4 min—
Dec 27 22:55 UTCGanymede disappears behind Jupitertakes 8 min—
Dec 28 00:07 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 28 01:10 UTCCallisto's shadow enters the disc—
Dec 28 01:14 UTCCallisto's shadow leaves the disc—
Dec 28 01:17 UTCCallisto's shadow enters the disctakes 11 min—
Dec 28 02:33 UTCGanymede reappears from behind Jupitertakes 8 min—
Dec 28 06:00 UTCCallisto's shadow leaves the disctakes 9 min—
Dec 28 10:13 UTCCallisto begins its transit across the disctakes 10 min—
Dec 28 14:43 UTCEuropa eclipses Ganymede25.6 min · 35% of Ganymede covered · drops ≈0.5 mag—
Dec 28 14:50 UTCCallisto's transit endstakes 10 min—
Dec 28 16:50 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 28 20:06 UTCIo reappears from behind Jupitertakes 4 min—
Dec 29 14:00 UTCEuropa's shadow enters the disctakes 6 min—
Dec 29 14:05 UTCIo's shadow enters the disctakes 6 min—
Dec 29 15:01 UTCIo begins its transit across the disctakes 4 min—
Dec 29 15:55 UTCEuropa begins its transit across the disctakes 4 min—
Dec 29 16:23 UTCIo's shadow leaves the disctakes 3 min—
Dec 29 16:55 UTCEuropa's shadow leaves the disctakes 3 min—
Dec 29 17:18 UTCIo's transit endstakes 4 min—
Dec 29 18:48 UTCEuropa's transit endstakes 4 min—
Dec 30 11:19 UTCIo disappears into Jupiter's shadowtakes 4 min—
Dec 30 14:33 UTCIo reappears from behind Jupitertakes 4 min—
Dec 30 23:52 UTCGanymede eclipses Io18.3 min · 89% of Io covered · drops ≈2.4 mag—
Dec 31 07:22 UTCGanymede eclipses Io25.4 min · 96% of Io covered · drops ≈3.6 mag—
Dec 31 08:33 UTCIo's shadow enters the disctakes 6 min—
Dec 31 08:39 UTCEuropa disappears into Jupiter's shadowtakes 4 min—
Dec 31 09:04 UTCGanymede's shadow enters the disctakes 13 min—
Dec 31 09:27 UTCIo begins its transit across the disctakes 4 min—
Dec 31 10:51 UTCIo's shadow leaves the disctakes 3 min—
Dec 31 11:45 UTCIo's transit endstakes 4 min—
Dec 31 12:44 UTCGanymede's shadow leaves the disctakes 7 min—
Dec 31 12:44 UTCGanymede begins its transit across the disctakes 8 min—
Dec 31 13:16 UTCEuropa reappears from behind Jupitertakes 4 min—
Dec 31 16:21 UTCGanymede's transit endstakes 8 min—
Dec 31 21:39 UTCGanymede eclipses Io10.8 min · 100% of Io covered · drops ≈7.5 mag—

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.