Asteroid Ida

Ida:

• lies between Mars & Jupiter
• 243rd asteroid discovered
• demensions: 56x24x21 Kilometers
• "stony iron" composition
• Estimated age: 1+ billion years
• first picture taken by Galileo

Galileo discovers a moon orbiting Ida in 1993.

• Images were received Feb 1994
• Dimensions: 1.2x1.4x1.6 km
• Same composition as Ida

                Radius Distance*
  Num Name       (km)  (10^6km) Albedo  Discoverer    Date
  ---------------------------------------------------------
    1 Ceres      457    413.9    0.10   G. Piazzi     1801
  511 Davida     168    475.4    0.05   R. Dugan      1903
   15 Eunomia    136    395.5    0.19   De Gasparis   1851
   52 Europa     156    463.3    0.06   Goldschmidt   1858
   10 Hygiea     215    470.3    0.08   De Gasparis   1849
  704 Interamnia 167    458.1    0.06   V. Cerulli    1910
    2 Pallas     261    414.5    0.14   H. Olbers     1802
   16 Psyche     132    437.1    0.10   De Gasparis   1852
   87 Sylvia     136    521.5    0.04   N. Pogson     1866
    4 Vesta      262.5  353.4    0.38   H. Olbers     1807
  951 Gaspra     17x10  205.0    0.20   Neujmin       1916
  243 Ida        58x23  270.0    ?      J. Palisa     29 Sep 1884
  

  * Mean distance from the Sun.
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