A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another...

They are respectively the fourth-, sixth-, first-, and third-largest natural satellites in the Solar System, containing approximately 99.997% of the total...

planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally...

The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces...

albedos. Absolute magnitudes of irregular satellites were taken from the Minor Planet Center's Natural Satellites Ephemeris Service. Calculations were made...

itself. Over a century passed before the discovery of the second natural satellite, Nereid, in 1949, and another 40 years passed before Proteus, Neptune's...

of natural satellites is the potential of moons to provide habitats for life, though it is not an indicator that they harbor it. Natural satellites are...

while orbital elements of irregular satellites are based on the epoch of 1 January 2020. List of natural satellites The mass of Triton is about 2.14 × 1022 kg...

and if a satellite, was near one of its elongations. Until this time I had said nothing to anyone at the Observatory of my search for a satellite of Mars...

The dwarf planet Pluto has five natural satellites. In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. Charon, the largest...

A satellite or artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. Satellites have a variety of uses...

extremely faint, with an apparent magnitude of 25 in visible light. The satellite is 1,300 times fainter than Makemake, which corresponds to a magnitude...

have at least one satellite. Among the fainter members of the trans-Neptunian population, only about 10% are known to have satellites. This is thought...

The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object...

of the existence of other moons of Earth—that is, of one or more natural satellites with relatively stable orbits of Earth, other than the Moon—have existed...

or a hypothetical natural satellite that orbits the moon of a planet. It is inferred from the empirical study of natural satellites in the Solar System...

has the most inclined orbital plane of the regular satellites; only the irregular outer satellites like Phoebe have more inclined orbits. Because of this...

In astronomy, an irregular moon, irregular satellite, or irregular natural satellite is a natural satellite following a distant, inclined, and often highly...

Neith is a hypothetical natural satellite of Venus reportedly sighted by Giovanni Cassini in 1672 and by several other astronomers in following years...

systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in...

(systematic designation: Mars II) is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km...

eccentric and appears to be greatly influenced by the larger satellite. Two small satellites were discovered around Haumea (which was at that time still...

Mercury is the closest planet to the Sun and lacks any natural satellites. An undiscovered moon orbiting the planet was hypothesized to exist in the early...

quasi-satellite of Pluto every 2.4 Myr and remains in that configuration for nearly 350,000 years. Artificial satellite Natural satellite Satellite system...

A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication...

A planetary-mass moon is a planetary-mass object that is also a natural satellite. They are large and ellipsoidal (sometimes spherical) in shape. Moons...

Prime examples are the anti-satellite weapon tests. There have been no observed collisions between natural satellites, but impact craters may show evidence...

Ganymede, or Jupiter III, is the largest and most massive natural satellite of Jupiter and in the Solar System. It is the largest Solar System object...

(sphaíra) 'sphere') is the rigid, outermost rocky shell of a terrestrial planet or natural satellite. On Earth, it is composed of the crust and the lithospheric mantle...

Yavin 4 (or Yavin IV) is a natural satellite in the Star Wars fictional universe. Located in the Outer Rim, this moon orbits the gas giant Yavin. It appears...