title: List of geological features on Ida and Dactyl
text: # List of geological features on Ida and Dactyl
  
  This is a list of named geological features on asteroid 243 Ida and its moon, Dactyl.
  
  ## Ida
  
  ### Regiones
  
  Idaean regiones (geologically distinct areas) are named after the discoverer of the asteroid, and the places where he worked.
  
  | Regio | Coordinates | Diameter (km) | Approval Date | Named After | Ref |
  | - | - | - | - | - | - |
  | Palisa Regio | 23°S 34°W﻿ / ﻿23°S 34°W﻿ / -23; -34﻿ (Palisa) | 23 | 1997 | Johann Palisa | WGPSN |
  | Pola Regio | 11°S 184°W﻿ / ﻿11°S 184°W﻿ / -11; -184﻿ (Pola) | 8 | 1997 | Pola, Croatia | WGPSN |
  | Vienna Regio | 8°N 2°W﻿ / ﻿8°N 2°W﻿ / 8; -2﻿ (Vienna) | 13 | 1997 | Vienna | WGPSN |
  
  ### Dorsa
  
  | Dorsum | Coordinates | Diameter (km) | Approval Date | Named After | Ref |
  | - | - | - | - | - | - |
  | Townsend Dorsum | 25°N 30°W﻿ / ﻿25°N 30°W﻿ / 25; -30﻿ (Townsend) | 40 | 1997 | Tim E. Townsend, a member of the Galileo probe imaging team | WGPSN |
  
  ### Craters
  
  Idaean craters are named after famous caves.
  
  | Crater | Coordinates | Diameter (km) | Approval Date | Named After | Ref |
  | - | - | - | - | - | - |
  | Afon | 6°30′S 0°00′E﻿ / ﻿6.5°S -0°E﻿ / -6.5; -0﻿ (Afon) | 0.8 | 1994 | Novy Afon Cave, Abkhazia | WGPSN |
  | Atea | 5°42′S 18°54′W﻿ / ﻿5.7°S 18.9°W﻿ / -5.7; -18.9﻿ (Atea) | 2 | 1997 | Atea Cave, Papua New Guinea | WGPSN |
  | Azzurra | 30°30′N 217°12′W﻿ / ﻿30.5°N 217.2°W﻿ / 30.5; -217.2﻿ (Azzurra) | 9.6 | 1997 | Azzurra Grotto, Italy | WGPSN |
  | Bilemot | 27°48′S 29°12′W﻿ / ﻿27.8°S 29.2°W﻿ / -27.8; -29.2﻿ (Bilemot) | 1.8 | 1997 | Bilemot Cave, Korea | WGPSN |
  | Castellana | 13°24′S 335°12′W﻿ / ﻿13.4°S 335.2°W﻿ / -13.4; -335.2﻿ (Castellana) | 5.2 | 1997 | Castellana Cave, Italy | WGPSN |
  | Choukoutien | 12°48′N 23°36′W﻿ / ﻿12.8°N 23.6°W﻿ / 12.8; -23.6﻿ (Choukoutien) | 1.1 | 1997 | Choukoutien, China | WGPSN |
  | Fingal | 13°12′S 39°54′W﻿ / ﻿13.2°S 39.9°W﻿ / -13.2; -39.9﻿ (Fingal) | 1.5 | 1997 | Fingal's Cave, UK | WGPSN |
  | Kartchner | 7°S 179°W﻿ / ﻿7°S 179°W﻿ / -7; -179﻿ (Kartchner) | 0.9 | 1997 | Kartchner Caverns, AZ, United States | WGPSN |
  | Kazumura | 32°00′S 41°06′W﻿ / ﻿32°S 41.1°W﻿ / -32; -41.1﻿ (Kazumura) | 2.1 | 1997 | Kazumura Cave, HI, United States | WGPSN |
  | Lascaux | 0°48′N 161°12′W﻿ / ﻿0.8°N 161.2°W﻿ / 0.8; -161.2﻿ (Lascaux) | 11.8 | 1997 | Lascaux Cave, France | WGPSN |
  | Lechuguilla | 7°54′N 357°06′W﻿ / ﻿7.9°N 357.1°W﻿ / 7.9; -357.1﻿ (Lechuguilla) | 1.5 | 1997 | Lechuguilla Cave, NM, United States | WGPSN |
  | Mammoth | 18°18′S 180°18′W﻿ / ﻿18.3°S 180.3°W﻿ / -18.3; -180.3﻿ (Mammoth) | 10.2 | 1997 | Mammoth Cave, KY, United States | WGPSN |
  | Manjang | 28°18′S 90°30′W﻿ / ﻿28.3°S 90.5°W﻿ / -28.3; -90.5﻿ (Manjang) | 1 | 1997 | Manjang Cave, Korea | WGPSN |
  | Orgnac | 6°18′S 202°42′W﻿ / ﻿6.3°S 202.7°W﻿ / -6.3; -202.7﻿ (Orgnac) | 10.6 | 1997 | Orgnac Cave, France | WGPSN |
  | Padirac | 4°18′S 5°12′W﻿ / ﻿4.3°S 5.2°W﻿ / -4.3; -5.2﻿ (Padirac) | 1.9 | 1997 | Padirac Cave, France | WGPSN |
  | Peacock | 2°S 52°W﻿ / ﻿2°S 52°W﻿ / -2; -52﻿ (Peacock) | 0.2 | 1997 | Peacock Cave, FL, United States | WGPSN |
  | Postojna | 42°54′S 359°54′W﻿ / ﻿42.9°S 359.9°W﻿ / -42.9; -359.9﻿ (Postojna) | 6 | 1997 | Postojna Cave, Slovenia | WGPSN |
  | Sterkfontein | 4°06′S 54°06′W﻿ / ﻿4.1°S 54.1°W﻿ / -4.1; -54.1﻿ (Sterkfontein) | 4.7 | 1997 | Sterkfontein, South Africa | WGPSN |
  | Stiffe | 27°54′S 126°30′W﻿ / ﻿27.9°S 126.5°W﻿ / -27.9; -126.5﻿ (Stiffe) | 1.5 | 1997 | Stiffe Cave, Italy | WGPSN |
  | Undara | 2°00′N 113°48′W﻿ / ﻿2°N 113.8°W﻿ / 2; -113.8﻿ (Undara) | 8.5 | 1997 | Undara Cave, Australia | WGPSN |
  | Viento | 12°12′N 343°54′W﻿ / ﻿12.2°N 343.9°W﻿ / 12.2; -343.9﻿ (Viento) | 1.6 | 1997 | Viento Cave, Spain | WGPSN |
  
  ## Dactyl
  
  Dactylian craters are named after the mythological Dactyls.
  
  | Crater | Coordinates | Diameter (km) | Approval Date | Named After | Ref |
  | - | - | - | - | - | - |
  | Acmon | 39°S 138°W﻿ / ﻿39°S 138°W﻿ / -39; -138﻿ (Acmon) | 0.3 | 1997 | Acmon | WGPSN |
  | Celmis | 46°S 220°W﻿ / ﻿46°S 220°W﻿ / -46; -220﻿ (Celmis) | 0.2 | 1997 | Celmis | WGPSN |
  