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The 2006 IAU redefinition of planet excludes the possibility of double planets. [24] [25] [26] 15760 Albion: 1992 unknown Trans-Neptunian object: When discovered, these bodies were briefly hailed as the tenth and eleventh planets by the press, but it was then decided that 15760 Albion was the prototype of trans-Neptunian objects or cubewanos ...
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 is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Proper names of planetary systems often follow common themes – for example, the planets of the star Copernicus are named after European astronomers. Proper names for planets outside of the Solar System – known as exoplanets – are chosen by the International Astronomical Union (IAU) through public naming contests known as NameExoWorlds.
Counting them among the planets became increasingly cumbersome. Eventually, they were dropped from the planet list (as first suggested by Alexander von Humboldt in the early 1850s) and Herschel's coinage, "asteroids", gradually came into common use. [139] Since then, the region they occupy between Mars and Jupiter is known as the asteroid belt.
At a distance of 136.1 AU (20.4 billion km; 12.7 billion mi) from Earth as of May 2024 [9] 4 Voyager 1: Voyager 1: 5 September 1977 [2] Titan IIIE Centaur-D1T [8] NASA: Flyby Successful Closest approach at 12:05 UTC on 5 March 1979. Flew past Amalthea, Europa, Ganymede and Callisto at long distances. Later flew past Saturn.
This list contains a list of most distant objects by year of discovery of the object, not the determination of its distance. Objects may have been discovered without distance determination, and were found subsequently to be the most distant known at that time. However, object must have been named or described.
For a list of planets as used in astrology, see: Planets in astrology; For a list of supposed planets not based on scientific evidence, see: Planetary objects proposed in religion, astrology, ufology and pseudoscience; For lists of planets in fiction, see: Fictional planets of the Solar System, Extrasolar planets in fiction § List, and List of ...
The first report of an exoplanet within this range was in 1998 for a planet orbiting around Gliese 876 (15.3 light-years (ly) away), and the latest as of 2024 is one around Struve 2398 A (11.5 ly). The closest exoplanets are those found orbiting the star closest to the Solar System, which is Proxima Centauri 4.25 light-years away.