Rare in the main belt, D-class asteroids crop up with increasing regularity beyond about 3.3 AU from the Sun. They have albedos of 0.02 to 0.05 and appear to be made of some of the most primitive material in the solar system.
Examples are found among many of Jupiter's Trojans, including the largest, Hektor. Also the Martian moons Phobos and Deimos may well be captured D-class asteroids and the Tagish Lake meteorite has been confirmed as a probable D-class fragment, the most likely parent-body candidate being 773 Irmintraud.
Related category ASTEROIDS: TYPES AND GROUPS
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