This is a list of Mars-crossing asteroids with companions. When NASA's Galileo spacecraft flew by the asteroid 243 Ida in 1993, it stumbled […] Dactyl is only about 1 mile wide, while Ida is about 19 miles across. Also in 2005, the dwarf planet Haumea was discovered to have two moons, making it the second trans-Neptunian object after Pluto known to have more than one moon. Moons — also known as natural satellites — orbit planets and asteroids. [21] For an overview, see summary and introduction. [2], The first modern era mention of the possibility of an asteroid satellite was in connection with an occultation of the bright star Gamma Ceti by the asteroid 6 Hebe in 1977. Prior to the era of the Hubble Space Telescope and space probes reaching the outer Solar System, attempts to detect satellites around asteroids were limited to optical observations from Earth. The exact shapes of the three bodies are unknown, but 87 Sylvia is elongated. [3], In addition to the terms satellite and moon, the term "binary" (binary minor planet) is sometimes used for minor planets with moons, and "triple" for minor planets with two moons. The largest asteroids with an accurately measured mass, because they have been (and are … [1] Candidate binaries with an unconfirmed status are displayed on a dark background. [12] This was followed by the discovery of a second moon orbiting 45 Eugenia. [1] Candidate binaries with an unconfirmed status are displayed on a dark background. This is a list of Jupiter trojans with companions. 2. As of October 2020[update], there are 416 minor planets with 435 known companions. But further out in the Solar System, there are tiny asteroids with even tinier moons. In addition to the inevitable observational bias (dependence on the distance from Earth, size, albedo and separation of the components) the frequency appears to be different among different categories of objects. The origin of minor-planet moons is not currently known with certainty, and a variety of theories exist. Additionally, 216 Kleopatra and 93 Minerva were discovered to be trinary asteroids in 2008 and 2009 respectively. The data about the populations of binary objects are still patchy. The tidal forces will cause the spacecraft’s orbit to decay until it crashes. Dactyl is only about 1 mile wide, while Ida is about 19 miles across. Javascript must be enabled to use Cool Cosmos. A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite. Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Observable universe → UniverseEach arrow (→) may be read as "within" or "part of". [17], What is "typical" for a binary system tends to depend on its location in the Solar System (presumably because of different modes of origin and lifetimes of such systems in different populations of minor planets).[18]. In 1993, an tiny moon called Dactyl was discovered orbiting the large asteroid Ida. The main-belt asteroid is the first minor planet known to possess two satellites. This is a list of trans-Neptunian objects with companions. Formation by collision is constrained by the angular momentum of the components, i.e. Yes, asteroids can have moons! Have any spacecraft landed on an asteroid? Among trans-Neptunian objects (TNOs), an estimated 11% are thought to be binary or multiple objects, and the majority of the large TNOs have at least one satellite, including all four IAU-listed dwarf planets. [13] Also in 2005, the dwarf planet Haumea was discovered to have two moons, making it the second trans-Neptunian object after Pluto known to have more than one moon. 301–318, Yarkovsky–O'Keefe–Radzievskii–Paddack effect, "Satellites and Companions of Minor Planets", Central Bureau for Astronomical Telegrams, "Imaging Observations of Asteroids with Hubble Space Telescope", "Astronomers Discover Moon Orbiting Asteroid", "IAUC 7741: 2001fc; S/2001 (617) 1; C/2001 T1, C/2001 T2", "Two Companions Found Near Dog-Bone Asteroid", "The discovery of a new triple asteroid – (93) Minerva", "Multiple Asteroid Systems: New Techniques to Study New Worlds", "Asteroids/TNOs with Satellites list by type and presumed level of confirmation", Orbits of Binary Asteroids with Adaptive Optics, Satellites and Companions of Minor Planets, List of interstellar and circumstellar molecules, https://en.wikipedia.org/w/index.php?title=Minor-planet_moon&oldid=990297227, Articles containing potentially dated statements from October 2020, All articles containing potentially dated statements, Articles with unsourced statements from June 2013, Creative Commons Attribution-ShareAlike License, Both systems in the form of ring systems that are likely contained by, This page was last edited on 23 November 2020, at 22:32. [4] A good example of a true binary is the 90 Antiope system, identified in August 2000. Pluto–Charon). They are among the most ancient objects in the solar system. Since then, several other moons have been discovered orbiting asteroids. [1] Candidate binaries with an unconfirmed status are displayed on a dark background. For example, in 1978, stellar occultation observations were claimed as evidence of a satellite for the asteroid 532 Herculina. Most orbit the giant planets — with Saturn and Jupiter leading moon counts — but …
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