home | sky notes | astro 101 | facebook | store

Asteroid, Ida

Average distance from the Sun     429.15 million km
Diameter     58 x 23 km
Mass     4.2e16 kg
Orbital period around the Sun     4.84 Earth years / 1,768 Earth days
Number of moons     1, Dactyl
Ida was the second asteroid to be observed close up by a spacecraft, when the Space Probe Galileo took pictures as it flew by on Aug 28, 1993. These pictures showed not only that Ida has a cratered surface, but also that it has a small moon called Dactyl, which is about 1.6 x 1.2 km in diameter and orbiting 90 km away from the asteroid.

Our Solar System

Our solar system is located on the edge of a spiral arm called Orion’s Arm, and is one-half to two-thirds of the way (28,000 light-years) from the center of our Milky Way galaxy.

The Sun, Sol

The Inner Planets
    The Moon

The Asteroid Belt
  Dwarf planet, Ceres
  Asteroid, Ida
  Asteroid, Vesta
  Asteroid, Eros

The Outer Planets

The Kuiper Belt
  Dwarf planet, Pluto
  Dwarf planet, Eris

The Oort Cloud
  Dwarf planet, Sedna
  Comet Halley
  Comet Hale-Bopp

  Glossary of Terms
Copyright © 1999- The Astrogirl Homepage. All Rights Reserved.
Sun Mercury Venus Earth Moon Mars Ceres Ida Eros Vesta Jupiter Saturn Uranus Neptune Pluto Eris Sedna