D-type asteroids have a very low albedo and a featureless reddish spectrum. It has been suggested that they have a composition of organic-rich silicates, carbon and anhydrous silicates, possibly with water ice in their interiors. D-type asteroids are found in the outer asteroid belt and beyond; examples are 152 Atala, 944 Hidalgo and most Jupiter trojans. It has been suggested that the Tagish Lake meteorite was a fragment from a D-type asteroid, and that the Martian moon Phobos is closely related.
The Nice model suggests that D-type asteroids may have originated in the Kuiper belt. 46 D-type asteroids are known, including: 3552 Don Quixote, 944 Hidalgo, 624 Hektor, and 10199 Chariklo.
Examples
A list of some of the largest D-type asteroids. Name of AsteroidClassification Diameter(km) DiametermethodMinor planetcategory SMASS Tholen 267 Tirza D DU IRAS Main-belt asteroid 279 Thule X D IRAS Outer main-belt asteroid 336 Lacadiera Xk D IRAS Main-belt asteroid 368 Haidea – D IRAS Main-belt asteroid 624 Hektor – D Direct imaging Jupiter trojan 721 Tabora – D IRAS Outer main-belt asteroid 773 Irmintraud T D IRAS Main-belt asteroid 884 Priamus – D Absmag Jupiter trojan 911 Agamemnon – D IRAS Jupiter trojan 944 Hidalgo – D Absmag Centaur 1143 Odysseus – D IRAS Jupiter trojan 1144 Oda – D IRAS Outer main-belt asteroid 1172 Äneas – D IRAS Jupiter trojan 1167 Dubiago – D IRAS Outer main-belt asteroid 1256 Normannia – D IRAS Outer main-belt asteroid 1269 Rollandia – D IRAS Outer main-belt asteroid 1578 Kirkwood – D IRAS Outer main-belt asteroid 1583 Antilochus – D IRAS Jupiter trojan 1746 Brouwer – D IRAS Outer main-belt asteroid 1867 Deiphobus – D IRAS Jupiter trojan 2207 Antenor – D IRAS Jupiter trojan 2241 Alcathous – D IRAS Jupiter trojan 2311 El Leoncito – D IRAS Outer main-belt asteroid 2312 Duboshin – D IRAS Outer main-belt asteroid 2357 Phereclos – D IRAS Jupiter trojan 2363 Cebriones – D IRAS Jupiter trojan 2674 Pandarus – D IRAS Jupiter trojan 2893 Peiroos – D IRAS Jupiter trojan 10199 Chariklo D – n.a. Centaur
See also Asteroid spectral types Tagish Lake (meteorite)
References