Moons of Jupiter

There have been 63 moons discovered hovering around Jupiter. It is divided into different groups: the Main group or Galilean moons, the Inner satellites or Amalthea group, the Himalia group, the Carme group, the Anake group and the Pasiphae group. Three known satellites are not member of any group – Themisto , S/2003 J2 and S/2003 J3.

Galilean Moons – are the four moons of Jupiter discovered by Galileo Galilee in 1610.

Io – With a diameter of 3,642 km it is the 4th largest natural satellite in the solar system. It was named after a priestess who became one of Zeus’ human lovers. It has over 400 volcanoes and is the most geologically active celestial body in the solar system.

Europa – Is only marginally smaller than Earth’s moon having a 3121.6 km diameter. Its atmosphere is composed mainly of oxygen. Its surface is mostly made of ice and it has the smoothest surface in the solar system.

Ganymede – It is the largest moon in the solar system with a 5262.4 km diameter. Though it is larger than Mercury, Ganymede only has half the planet’s mass.

Callisto – It is the third largest moon in the solar system with a 4820.9 km diameter. It is the least dense Galilean moons being composed mainly of rock and ice.

Amalthea Group

Metis – The moon closest to Jupiter and due to tidal acceleration it will crash on Jupiter’s surface eventually.

Adrastea – It is the first moon to be discovered with the use of a spacecraft instead of a telescope. Very little is known about this moon aside from the fact that it is tidally locked to the planet.

Amalthea – It was discovered in 1892 by Edward Bernard and was the last moon discovered through visual observation.

Thebe – Like the rest of the Amalthea group, rotates in synchronicity with its orbit, which means it always faces on side away from the planet.

Himalia group
Leda – 10 km mean radius.
Himalia – 85 km mean radius.
Lystheria – 18 km mean radius.
Elara – 43 km mean radius.

Carme group
Carme – 23 km mean radius
Taygete – 5 km diameter
Eukelade – 4 km diameter
S/2003 J 5 – 4 km diameter
Chaldene – 3.8 km diameter
Isonoe – 3.8 km diameter
Kalyke – 5.2 km diameter
Erinome – 3.2 km diameter
Aitne – 3 km diameter
Kale – 2 km diameter
Pasithee – 2 km diameter
S/2003 J 9 – 1 km diameter
S/2003 J 10 – 2 km diameter

Ananke group

Pasiphae Group

Moons of Jupiter

  • Spark Rock Girl

    Jupiter sure has a lot of moons! My project just got harder! :)

  • alex

    this is every cool!

  • Lionel Koran

    This is the right blog for anyone who wants to find out about this topic. You realize so much its almost hard to argue with you (not that I actually would want…HaHa). You definitely put a new spin on a topic thats been written about for years. Great stuff, just great!

  • http://gmail tanishka

    i have learnt the biggest moon is yanare

  • Aaronius

    i am trying to map out how many of Jupiter’s know counted up to 64 moons are actualy moons of Jupiter and not just asteroid debris from Earth Mark One’s impact. BTW Mars’s 2 asteroid moons were made form the same Earth impact. Soo, i need to know if anyone has a more acuretly maped out and named image or specs of all of Jupiters moons. Several of Jupiter’s moons are very close to the Tittus-Bode and Laplace Laws but there also may be as many as 3 of Jupiters moons misssing wich would throw off the calculations if you did not already know. Im sure many of you can easalysee most of Jupitors moons are not acting like natural satellites but more like captured debris. .. thin i need to repeat the calculations keeping in mine 1 moon form Satern maybe missing and three form Uranis. but then they are all sprinkeled with the rocky debris scatered across the solar system from … Earth getting cracked in half…ohh and the Pacific ocean is the crater. .. soo if you can drop any info on me ab out the trajectorys of all the Gas planets moons, there orders and orbits it would help me greatly and may help to change what we know collectivly.. re post here so all can see or email me at a

  • Unknown

    Awesomee… &&’d Interestinq’.. i Guess..

  • sara!!!

    aurelia, please learn how to spell. I’m sure you are a very educated person, but with your spelling you seem somewhat uneducated.
    I do agree with you though this website, could use some more info, but i have found all i needed for my project!!(:

  • http://planetfacts sanada

    40 moons im in grade 12

  • SteveResler

    As of 2003, there are 64 confirmed moons of Jupiter…and given enough observation there will be more rocks discovered.

  • Shadow111Sonic333ftw


  • T.D.S. (tedious)

    Yeah, jeez, people. Where did you learn about Jupiter’s “50” moons? You know, when you Google something, you need to hit ‘2011’, or ‘2012’, depending on the year, because if you are looking at a website that was made and last updated in, like, the 1950’s or something, you can pretty much guarantee that it’ll be wrong.

    Here’s a website (don’t worry, it’s totally correct, checked it a few days ago) that lists all of Jupiter’s current moons.

  • alexxie

    Mykay: going !!!!!!!!!!!!!!!!!!!!!!!!! over and over only highlights your (lack of a ) brain capacity you moron. And by the way there are 63 moons.

  • Lacy May

    Actually all of you are wrong! There actually 63 known moons orbiting planet Jupiter!
    I am a 10th grade teacher. You all need to be more respectful! This site is a very informational site!

  • Mykay

    woow!!!!!!!! the person who published this website is STUPID!!!!!! There are only 50 moons of Jupiter!!!!! Get your facts straight!!!

  • ashlynn

    ok so it says theres 63 moons and it onlt lists 42 what up with that?

  • http://planets alexxa


  • Alexis Rivera

    there is only 50 moons of jupiter dummy !

  • http://yahoo aurelia

    thx 4 da info cuz ii needed it on my school project but ahdd moe info plzz like how big around is the planet nd is it faster or slower dan earth