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Name Launch vehicle Status Description Mass 1957 October 4 Soviet Union: Sputnik 1: Sputnik-PS: Success: The first human-made object to orbit Earth. 83.6 kg (183.9 lb) November 3 Soviet Union: Sputnik 2: Sputnik-PS: Success: The first satellite to carry a living animal, a dog named Laika. 508 kg (1,118 lb) December 6 US: Vanguard 1A: Vanguard ...
Searches for more satellites have been unsuccessful, putting the maximum radius of any other satellites at 90 m (100 yd). [ 4 ] Jupiter has 95 moons with known orbits; 72 of them have received permanent designations, and 57 have been named.
It was initially thought to the innermost of the retrograde satellites of Jupiter, but recovery observations have shown that it is an ordinary member of the Ananke group. [ 6 ] Blink animation of S/2003 J 12 in CFHT precovery images from December 2001 Recovery images of S/2003 J 12 taken by the CFHT in August 2011
Mission: investigating Jupiter and Saturn, and the moons of these planets. Its continuing data feed offered the first direct measurements of the heliosheath and the heliopause. It is currently the furthest man-made object from Earth, as well as the first object to leave the heliosphere and cross into interstellar space.
The term satellite thus became the normal one for referring to an object orbiting a planet, as it avoided the ambiguity of "moon". In 1957, however, the launching of the artificial object Sputnik created a need for new terminology. [5] The terms man-made satellite and artificial moon were very quickly abandoned in favor of the simpler satellite ...
Ganymede, or Jupiter III, is the largest and most massive natural satellite of Jupiter, and in the Solar System. Despite being the only moon in the Solar System with a substantial magnetic field , it is the largest Solar System object without a substantial atmosphere.
Human-made objects orbiting the Sun, Mercury, Venus, Earth, Mars, and Saturn, including active artificial satellites and space junk; Heliosphere, a bubble in space produced by the solar wind Heliosheath. Heliopause; Hydrogen wall, a pile up of hydrogen from the interstellar medium
Satellite systems are referred to either by the possessive adjectives of their primary (e.g. "Jovian system"), or less commonly by the name of their primary (e.g. "Jupiter system"). Where only one satellite is known, or it is a binary with a common centre of gravity, it may be referred to using the hyphenated names of the primary and major ...