Jupiter
The planets of the solar system:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Jupiter is currently visible as a morning object. From Fairfield, it is visible in the morning sky, becoming accessible around 21:55, when it reaches an altitude of 7° above your north-eastern horizon. It will then reach its highest point in the sky at 04:32, 71° above your southern horizon. It will be lost to dawn twilight around 06:46, 56° above your south-western horizon.
09 Oct 2024 | – Jupiter enters retrograde motion |
07 Dec 2024 | – Jupiter at opposition |
04 Feb 2025 | – Jupiter ends retrograde motion |
11 Nov 2025 | – Jupiter enters retrograde motion |
Jupiter, as seen by Cassini when it passed the planet on its way to Saturn. Image courtesy of NASA.
Jupiter is the fifth planet from the Sun, orbiting at a distance of 5.20 AU once every 11.86 years.
It is the solar system's largest and most massive planet, with 2.5 times the mass of all the other planets combined, and over 300 times that of the Earth. Its radius is over 10 times that of the Earth, but despite this, it rotates on its axis at phenomenal speed, completing one revolution every 9.9 hours.
Apparitions of Jupiter
The table below lists apparitions of Jupiter around the year 2024, computed from NASA's DE430 planetary ephemeris. To show events around other years, use the control below.
Apparitions of Jupiter around 2024
Date | Event | Declination | Angular size |
Date | Event | Declination | Angular size |
06 Feb 2015 13:12 EST | Jupiter at opposition | 16°31'N | 44.4" |
08 Mar 2016 05:49 EST | Jupiter at opposition | 6°04'N | 43.5" |
07 Apr 2017 17:31 EDT | Jupiter at opposition | 5°36'S | 43.3" |
08 May 2018 20:31 EDT | Jupiter at opposition | 16°00'S | 43.8" |
10 Jun 2019 11:20 EDT | Jupiter at opposition | 22°25'S | 45.0" |
14 Jul 2020 03:50 EDT | Jupiter at opposition | 21°57'S | 46.6" |
19 Aug 2021 20:20 EDT | Jupiter at opposition | 13°38'S | 48.0" |
26 Sep 2022 15:25 EDT | Jupiter at opposition | 0°08'S | 48.8" |
03 Nov 2023 00:55 EDT | Jupiter at opposition | 13°31'N | 48.4" |
07 Dec 2024 15:50 EST | Jupiter at opposition | 22°01'N | 47.1" |
10 Jan 2026 03:34 EST | Jupiter at opposition | 22°14'N | 45.6" |
10 Feb 2027 19:21 EST | Jupiter at opposition | 15°16'N | 44.2" |
12 Mar 2028 11:29 EDT | Jupiter at opposition | 4°29'N | 43.4" |
11 Apr 2029 23:57 EDT | Jupiter at opposition | 7°09'S | 43.3" |
13 May 2030 07:25 EDT | Jupiter at opposition | 17°11'S | 44.0" |
15 Jun 2031 05:12 EDT | Jupiter at opposition | 22°49'S | 45.2" |
19 Jul 2032 04:26 EDT | Jupiter at opposition | 21°14'S | 46.8" |
25 Aug 2033 01:32 EDT | Jupiter at opposition | 11°59'S | 48.2" |
Composition
Jupiter is a gas giant planet, composed mostly of hydrogen and helium. It does not have a solid surface and is comprised almost entirely of gas, though it may have a small solid core at its center.
Within this gaseous atmosphere there are thick clouds of tiny solid crystals, predominantly of ammonia. It is these clouds which make Jupiter opaque and determine its visual appearance.
These clouds are highly varied in color, meaning that Jupiter's disk has the greatest color contrasts of any of the planets. The pale-colored bright zones represent up-wellings of warm material, and the clouds tops of these zones are at higher altitude than those of the darker belts that separate them.
The dark belts appear to comprise of cooler sinking material, and it is believed that their deep red color stems from the interaction of the Sun's ultraviolet light with molecules dredged up from deeper within Jupiter's atmosphere by convection currents. While chemists refer to these molecules as chromophores, this is merely a generic term for any brightly colored compound, and the precise chemical composition of the chromophores present in Jupiter's atmosphere is not well understood.
The planet's rapid rotation drives weather systems which mean these rising and sinking regions predominate at alternate latitudes, in much the same way that the Earth's trade winds form. This creates Jupiter's familiar striped sequence of bands.
The two centre-most dark belts, closest to the equator, should be immediately apparent in even moderately poor seeing conditions. These are the North Equatorial Belt (NEB) and the South Equatorial Belt (SEB). On the southern edge of the SEB lies the famous Great Red Spot (GRS) which, when is readily apparent even in poor conditions.
Observing Jupiter
Jupiter's large angular size of up to 55" is rivalled only by Venus, and makes its disk quite apparent even through a modest pair of binoculars.
Its rapid rotation, however, makes long-exposure imaging tricky. Modern image-stacking software such as AutoStakkert not only use lucky imaging – selecting frames from long video sequences with the best atmospheric conditions – but also correct for the fact that the planet may have rotated over the course of the observation.
Finding Jupiter
Jupiter comes to opposition once every 399 days – its synodic period.
Where it lies in the sky affects how easily it can be observed from the northern or southern hemispheres, and because, by definition, it lies almost directly opposite the Sun at opposition, there is a close relationship between the time of year when Jupiter comes to opposition, and how well placed it is for observation.
When Jupiter comes to opposition in the northern summer months, the Sun is high in the northern sky, which places the opposite side of the eclipic plane in the southern sky. This means that Jupiter is poorly placed for observation from the northern hemisphere when at opposition in the summer.
Conversely, if Jupiter is at opposition in December, it is sure to be high in the northern sky.
The chart below shows the time of year of all of Jupiter's oppositions between the years 2000 and 2120, together with the declination that Jupiter will have at the time, measured on the vertical axis.
A chart of the time of day when Jupiter rises and sets on any given day of the year can be found here . A chart of Jupiter's path relative to the background stars can be found here.
NORAD ID | COSPAR ID | Name | Launch date | Flight ended | Owner |
NORAD ID | COSPAR ID | Name | Launch date | Flight ended | Owner |
5860 | 1972-012A | PIONEER 10 | 03 Mar 1972 | United States | |
6421 | 1973-019A | PIONEER 11 | 05 Apr 1973 | United States | |
10271 | 1977-076A | VOYAGER 2 | 19 Aug 1977 | United States | |
10321 | 1977-084A | VOYAGER 1 | 04 Sep 1977 | United States | |
20842 | 1990-090B | ULYSSES | 05 Oct 1990 | United States | |
28928 | 2006-001A | NEW HORIZONS | 19 Jan 2006 | United States |