This image was acquired by amateur astronomer Damian Peach on September 12, , when Jupiter was close to opposition. Jupiter is the largest planet in our Solar System and the easiest to observe. You can see it with the naked eye, binoculars or a small telescope. During this month, it has been very well placed for observing as it reached opposition in early January. This means that it is directly opposite the Sun in the sky from our point of view here on Earth and is therefore visible all night.
Jupiter Will Loom so Big and Bright This Weekend, You'll Be Able to See It No Matter Where You Are
Jupiter's Big Moon Ganymede Mapped by Amateur Astronomer | Space
They were first seen by Galileo Galilei in December or January , and recognized by him as satellites of Jupiter in March They are among the largest objects in the Solar System with the exception of the Sun and the eight planets , with a radius larger than any of the dwarf planets. Ganymede is the largest moon in the Solar System, and is even bigger than the planet Mercury , though only around half as massive. The three inner moons—Io, Europa, and Ganymede—are in a orbital resonance with each other. Because of their much smaller size, and therefore weaker self-gravitation , all of Jupiter's remaining moons have irregular forms rather than a spherical shape.
Did you know that there is a gigantic and extremely accurate clock with four "hands" in our solar system? And that you can watch this clock on nearly any clear night? The cosmic timepiece is created by Jupiter's four largest moons — Io, Europa, Ganymede and Callisto, which behave like hands on a clock with the gas giant planet at the center.
An amateur astronomer has created the first-ever homemade brightness map of Jupiter 's huge moon Ganymede in a magnificent display of how non-professional skywatchers can contribute to the field of observational astronomy. Greek skywatcher Emmanuel Kardasis of the Hellenic Amateur Astronomy Association created the new Ganymede map using a common "hobby" telescope and off-the-shelf camera and computer equipment. His map matches up well with images of Ganymede's surface taken by professionals, said officials with the European Planetary Science Congress EPSC , which is meeting this week in Madrid.