Directory · Small bodies
Asteroids, comets & visitors
The small bodies that carry the Solar System’s early history, and the interstellar travellers that arrived from other stars.
Interstellar visitors
CNEOS 2014‑01‑08Candidate meteor · impact 2014A high-speed fireball whose claimed interstellar origin remains debated.
1I/‘OumuamuaInterstellar object · discovered 2017The first confirmed object from another star system.
2I/BorisovInterstellar comet · discovered 2019The first confirmed interstellar comet.
3I/ATLASInterstellar comet · discovered 2025The third confirmed visitor from another planetary system.
Asteroids
1 CeresDwarf planet / asteroid · discovered 1801A water-rich world in the asteroid belt.
2 PallasAsteroid · discovered 1802A large, tilted main-belt world awaiting its first visitor.
4 VestaAsteroid / protoplanet · discovered 1807A differentiated survivor from the early Solar System.
10 HygieaAsteroid · discovered 1849A carbon-rich, nearly spherical survivor of a giant impact.
16 PsycheMetal-rich asteroid · discovered 1852A possible exposed planetary core, now the target of NASA’s Psyche mission.
Comets
1P/HalleyPeriodic comet · recorded since 240 BCEThe comet that returns about every 76 years.
2P/EnckePeriodic comet · discovered 1786A frequent visitor and source of the Taurid meteors.
9P/Tempel 1Periodic comet · discovered 1867The first comet deliberately struck by a spacecraft.
19P/BorrellyPeriodic comet · discovered 1904A dark, active comet imaged by the ion-powered Deep Space 1.
67P/Churyumov-GerasimenkoPeriodic comet · discovered 1969The comet explored by Rosetta and Philae.
Curated, not exhaustive. These are selected small-body field notes. NASA/JPL currently lists three confirmed interstellar objects: 1I, 2I, and 3I. CNEOS 2014-01-08 is included separately as a debated candidate.
Round dwarf planets and the outer-system regions have their own categories: dwarf planets · icy worlds · Kuiper Belt · Oort Cloud · heliopause.