S-type asteroids are of a silicaceous composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C-type asteroid....
), and metal
Metal ...
S-type Asteroid - One of a class of asteroids whose reflectance spectra show an absorption feature due to the mineral olivine
Saros - The length of time between one member of a series of similar eclipses and the next (6585 1/3 days) ...
4. S-type asteroids are more common in the inner part of the asteroid belt. (Hint)
5. The least reflective asteroids are C-type. (Hint) ...
433 Eros is an S-type asteroid orbiting the Sun mostly between the orbits of Earth and Mars.
orbit: 172,800,000 km from the Sun (average) size: 33x13x13 km
Eros was the Greek god of love and desire.
Geographos is an S-type asteroid, meaning that it is highly reflective and composed of nickel-iron mixed with iron- and magnesium-silicates.
External links
* NASA Asteroid Radar Research - Radar-Detected Asteroids: 1620 Geographos ...
As an S-type asteroid, Ida is composed mostly of silicate rocks. Galileo scientists believe the moon may have been created at the same time as Ida when an older, larger asteroid was shattered in a collision with another asteroid, ...
74 (perihelion) astronomical units from the Sun, Ida is an S-type asteroid composed primarily pyroxene, olivine, and iron. Its full name is 243 Ida, meaning that Ida was the 243rd asteroid to have its orbit catalogued.
Gaspra is an s-type asteroid; Ida's composition is not thought to be like an s-type, so it's a bit up in the air, while Mathilde is a c-type asteroid.
C-type asteroids - carbonaceous, 75% of known asteroids
S-type asteroids - silicaceous, 17% of known asteroids
L-type asteroids - metallic, 8% of known asteroids ...
Another high-inclination group in the inner part of the main belt is the Phocaea family. These are composed primarily of S-type asteroids, where as the neighboring Hungaria family includes some E-types.[72] The Phocaea family orbit between 2.25 and 2.
About 17% are S-type asteroids, which are brighter, with an albedo of 0.10 to 0.22. They are metallic nickel-iron mixed with iron- and magnesium-silicates. Most of the rest are M-type asteroids, with an albedo of 0.10 to 0.
Mathilde is a dark C-type (brightness enhanced several times to match the other three). Gaspra, Ida, and Eros are S-type asteroids. Mathilde and Eros were visited by NEAR Shoemaker and Gaspra and Ida were visited by Galileo.
in August 1993, the asteroid 243 Ida became the second asteroid to be visited by spacecraft from Earth when Galileo undertook a close encounter. Ida also is a big stone, classified as an S-type asteroid composed of metal-rich silicates.
 See also: Asteroid, Asteroids, Orbit, Earth, Sun
  
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