Ida

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Ida
Ida is an asteroid in the Koronis family of the asteroid belt. Like all main-belt asteroids, Ida's orbit lies between the planets Mars and Jupiter. On 28 August 1993, Ida was visited by the spacecraft Galileo, bound for Jupiter. It was the second asteroid to be visited by a spacecraft and the first found to have a natural satellite. Ida is a distinctly elongated asteroid, with an irregular surface. Ida is 2.35 times as long as it is wide, and a "waist" separates it into two geologically dissimilar halves. This constricted shape is consistent with Ida being made of two large, solid components, with loose debris filling the gap between them. 243 Ida - Wikipedia, the free encyclopedia
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Short Description Ida is an asteroid in the Koronis family of the asteroid belt. Like all main-belt asteroids, Ida's orbit lies between the planets Mars and Jupiter. On 28 August 1993, Ida was visited by the spacecraft Galileo, bound for Jupiter. It was the second asteroid to be visited by a spacecraft and the first found to have a natural satellite. Ida is a distinctly elongated asteroid, with an irregular surface. Ida is 2.35 times as long as it is wide, and a "waist" separates it into two geologically dissimilar halves. This constricted shape is consistent with Ida being made of two large, solid components, with loose debris filling the gap between them. 243 Ida - Wikipedia, the free encyclopedia
Discovered by Johann Palisa
Discovery date September 29, 1884
Type Asteroid
AddInfo Koronis family
Satellite of Sun
Minor planet number 243
Orbit Prograde
Rotation Direct
Satellites Has satellites
Apoapsis 09 446 372 000 km
Periapsis 09 410 084 000 km
Semi-major axis 09 428 228 000 km
Distance from Sun 01 2.862 au
Eccentricity 0.0452
Orbital period 1.768 136 days | 4.840 89 years
Orbital speed 02 17.6 km/s
Mean anomaly 191.869°
Inclination to the ecliptic 001.138°
Longitude of the ascending node 324.218°
Argument of periapsis 108.754°
Diameter/Size 02 31.4 km
Dimensions 59.8 × 25.4 × 18.6 km
Mass 1016×4.2 ± 0.6 kg
Density 01 2.6 ± 0.5 g/cm3
Surface gravity  0.0109 m/s2
Escape velocity 02 18.72 m/s
Rotation period 4.63 hours | 0.193 day
North pole right ascension 168.76°
North pole declination −002.88°
Albedo geometric 0.2383
Temperature mean 03 200 K | −73 °C
Apparent magnitude 14.9
Absolute magnitude 9.94
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