This is a list of named geological features on asteroid 243 Ida and its moon, Dactyl.
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Idaean regiones (geologically distinct areas) are named after the discoverer of the asteroid, and the places where he worked.
| Regio | Named after |
|---|---|
| Palisa Regio | Johann Palisa |
| Pola Regio | Pola, Croatia |
| Vienna Regio | Vienna |
The only named dorsum on Ida is Townsend Dorsum, named after Tim E. Townsend, a member of the Galileo probe imaging team.
Idaean craters are named after famous caves.
| Crater | Named after |
|---|---|
| Afon | Novy Afon Cave, Abkhazia |
| Atea | Atea Cave, Papua New Guinea |
| Azzurra | Azzurra Grotto, Italy |
| Bilemot | Bilemot Cave, Korea |
| Castellana | Castellana Cave, Italy |
| Choukoutien | Choukoutien, China |
| Fingal | Fingal's Cave, UK |
| Kartchner | Kartchner Caverns, AZ, USA |
| Kazumura | Kazumura Cave, HI, USA |
| Lascau | Lascaux Cave, France |
| Lechuguilla | Lechuguilla Cave, NM, USA |
| Mammoth | Mammoth Cave, KY, USA |
| Manjang | Manjang Cave, Korea |
| Orgnac | Orgnac Cave, France |
| Padirac | Padirac Cave, France |
| Peacock | Peacock Cave, FL, USA |
| Postojna | Postojna Cave, Slovenia |
| Sterkfontein | Sterkfontein, South Africa |
| Stiffe | Stiffe Cave, Italy |
| Undara | Undara Cave, Australia |
| Viento | Viento Cave, Spain |
Dactylian craters are named after the mythological Dactyls.
| Crater | Named after |
|---|---|
| Acmon | Acmon |
| Celmis | Celmis |