24. Ida
Galileo black and white image of asteroid Ida and moon.
Galileo hi-res image asteroid Ida
24. Ida

24. Ida

Courtesy of NASA/JPL Galileo mission

http://photojournal.jpl.nasa.gov/jpeg/PIA00136.jpg


Asteroid

Diameter: 56x24x21 km
Orbit Radius : 2.85 AU
Orbital Period: 4.8 years
Average Temperature: -73°C
Composition: Rocky
Number of Moons: 1 (Dactyl)
Atmospheric Pressure: 0 bars
Gravity (Earth=1): 0.0002
Mass (Earth=1): 0.000000007
Magnetic Field: Unknown