Jupiter trojanThe Jupiter trojans, commonly called trojan asteroids or simply trojans, are a large group of asteroids that share the planet Jupiter's orbit around the Sun. Relative to Jupiter, each trojanlibrates around one of Jupiter's stable Lagrange points: either L4, existing 60° ahead of the planet in its orbit, or L5, 60° behind. Jupiter trojans are distributed in two elongated, curved regions around these Lagrangian points with an average semi-major axis of about 5.2 AU.
944 Hidalgo944 Hidalgo is a centaur and unusual object on an eccentric, cometary-like orbit between the asteroid belt and the outer Solar System, approximately 52 kilometers (32 miles) in diameter. Discovered by German astronomer Walter Baade in 1920, it is the first member of the dynamical class of centaurs ever to be discovered. The dark D-type object has a rotation period of 10.1 hours and likely an elongated shape. It was named after Mexican revolutionary Miguel Hidalgo y Costilla.
Asteroid beltRegion between the orbits of Mars and JupiterThe asteroids of the inner Solar System and Jupiter: the belt is located between the orbits of Jupiter and Mars. By far the largest object within the belt is the dwarf planet Ceres.
152 Atala152 Atala is a large main beltasteroid that was discovered by brothers Paul Henry and Prosper Henry on 2 November 1875, but the discovery was credited to Paul. It is a type D asteroid, meaning that it is composed of carbon, organic rich silicates and possibly water ice. The asteroid is named for the eponymous heroine of the 1801 novellaAtala by François-René de Chateaubriand.
Asteroid spectral typesAn asteroid spectral type is assigned to asteroids based on their reflectance spectrum, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition. For small bodies that are not internally differentiated, the surface and internal compositions are presumably similar, while large bodies such as Ceres and Vesta are known to have internal structure.
SilicateA silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula [SiO4−x]n, where 0 ≤ x < 2. The family includes orthosilicateSiO4−4 (x = 0), metasilicateSiO2−3 (x = 1), and pyrosilicateSi2O6−7 (x = 0.5, n = 2). The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate.
AlbedoAlbedo ( ; from Latin albedo'whiteness') is the fraction of sunlight that is diffusely reflected by a body. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects all incident radiation). Surface albedo is defined as the ratio of radiosityJe to the irradianceEe (flux per unit area) received by a surface.AnhydrousA substance is anhydrous if it contains no water. Many processes in chemistry can be impeded by the presence of water; therefore, it is important that water-free reagents and techniques are used. In practice, however, it is very difficult to achieve perfect dryness; anhydrous compounds gradually absorb water from the atmosphere so they must be stored carefully. Substances that contain water or its constituent elements are called hydrates.
CarbonChemical element with atomic number 6 (C)–↑C↓Siboron ← carbon → nitrogen
Tagish Lake (meteorite)The Tagish Lake meteorite fell at 16:43 UTC on 18 January 2000 in the Tagish Lake area in northwestern British Columbia, Canada. HistoryFragments of the Tagish Lake meteorite landed upon the Earth on January 18, 2000, at 16:43 UT (08:43 local time in Yukon) after a large meteoroid exploded in the upper atmosphere at altitudes of 50–30 kilometres (31–19 mi) with an estimated total energy release of about 1.7 kilotons of TNT.
Phobos (moon)Larger of the two moons of MarsPhobos () is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after the Greek god of fear and panic, who is the twin brother of Deimos and son of Ares (Mars). Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi).
IceFrozen water; the solid state of waterIce is water that is frozen into a solid state, typically forming at or below temperatures of 0 °C, 32 °F, or 273.15 K. It occurs naturally on Earth, on other planets, in Oort cloud objects, and as interstellar ice. As a naturally occurring crystalline inorganic solid with an ordered structure, ice is considered to be a mineral.*As an Amazon Associate I earn from qualifying purchases.