Types of Asteroids
Type↕ | Composition↕ | Example↕ | Abundance↕ | Typical Location↕ | Notes↕ |
|---|---|---|---|---|---|
C-type (Carbonaceous) | Carbon-rich silicates, clay, organic compounds | 10 Hygiea | ~75% of known asteroids | Outer asteroid belt | Very dark, ancient, preserve composition of early solar nebula |
S-type (Silicaceous) | Silicates (pyroxene, olivine) and nickel-iron | 15 Eunomia | ~17% of known asteroids | Inner asteroid belt | Brighter, rocky, source of most ordinary chondrite meteorites |
M-type (Metallic) | Nickel-iron metal; possibly remnant cores | 16 Psyche | ~8% of known asteroids | Middle asteroid belt | NASA Psyche mission (2023) targets a 226 km metal world |
V-type (Vestoids) | Basaltic (pyroxene-rich) | 4 Vesta | Small but distinctive group | Inner belt | Fragments of Vesta's crust after a giant impact; HED meteorites on Earth |
Near-Earth Asteroid (NEA) | Varies (S, C, M types) | 433 Eros | ~30,000 known | Orbits cross Earth's neighborhood | NEAR-Shoemaker landed on Eros in 2001; OSIRIS-REx sampled Bennu |
Apollo Asteroid | Varies | 1862 Apollo | Most common NEA group | Earth-crossing orbits | Semi-major axis greater than Earth; can make close approaches |
Aten Asteroid | Varies | 2062 Aten | Less common | Mostly inside Earth's orbit | Semi-major axis less than 1 AU; small but potentially hazardous |
Trojan Asteroid | Dark, carbonaceous and D-type | 624 Hektor | Thousands at Jupiter L4/L5 | Jupiter's Lagrange points L4 and L5 | NASA Lucy mission is visiting 8 Trojans |
Centaur | Ice and rock | 2060 Chiron | ~500 known | Between Jupiter and Neptune | Unstable orbits; likely escaped Kuiper Belt objects |
Trans-Neptunian Object (TNO) | Ice, rock, frozen volatiles | Pluto, Eris | Over 3,000 known | Beyond Neptune (~30-55 AU) | Includes Kuiper Belt and scattered disk objects |
D-type Asteroid | Organic-rich silicates and carbon | 624 Hektor | Common among Jupiter Trojans | Outer belt and beyond | Extremely dark; very red in color; ancient composition |
P-type Asteroid | Carbon and silicates, possibly ice | 46 Hestia | Uncommon | Outer belt | Featureless, reddish, low albedo |
E-type Asteroid | Enstatite achondrites | 44 Nysa | Rare | Inner belt (Hungaria family) | High albedo; linked to aubrite meteorites |
Amor Asteroid | Varies | 1221 Amor | Several thousand | Approach but don't cross Earth orbit | Mars-crossers; include 433 Eros |
Main-Belt Comet | Rock with buried ice | 133P/Elst-Pizarro | Small class | Outer asteroid belt | Display comet-like activity; bridge between asteroids and comets |
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