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Atira asteroids or Apohele asteroids, also known as Interior-Earth Objects (IEOs), are asteroids, whose orbits are entirely confined within Earth's orbit, that is, their orbit has an aphelion (farthest point from the Sun) smaller than Earth's perihelion (nearest point to the Sun), which is 0.983 astronomical units (AU). Atira asteroids are by far the smallest group of near-Earth objects, compared to the Aten, Apollo and Amor asteroids.
| Small Solar System Bodies including comets | ||
|---|---|---|
| Cis-Neptunian | NEO | ꞌAylóꞌchaxnim • Atrias • Apollos • Arjunas • Amors • Venus Trojan • Earth Trojans • Mars Trojans • Quasi-Satellites |
| Main Belt/Jupiter Trojans | Asteroids • Various Collisional Families • Ceres/Vesta Trojans • Hilda • Jupiter Trojans • Quasi-Satellites | |
| Distant/Centaur | Centaur • Damocloid • Saturn Trojan • Uranus Trojans • Neptune Trojans | |
| TNO | Kuiper Belt/KBO | Classical (Cold • Hot) • Resonant (Plutino • Twotino) |
| Scattered disc/SDO | Resonant | |
| ETNO | ESDO | |
| EDDO | Sednoid → Oort Cloud Objects | |
| Comets | NEC • Sungrazing/Kreutz Sungrazing • Remnant • Extinct • Lost • Jupiter • Quasi-Hilda • Halley-type | |