Universe Guide

(243) Ida Asteroid

Ida is an asteroid, a large rock that orbits the Sun mainly between the orbits of Mars and Jupiter. They tend to be an irregular shaped but Ceres asteroid is known to be spherical in shape but because it doesn't clear its path round the Sun, it is only a dwarf planet. Its mass is estimated/calculated at being 100 kg. Its orbit takes 4.84 years to travel round the Sun. Its takes 4.633 hours to do a full rotation period.

The absolute magnitude of the object is 9.94 which is the brightness of the object. A higher absolute magnitude means that the object is faint whereas a very low number means it is very bright.

The albedo of the object is 1. The Albedo is the amount of radiation that is reflected back into space by the object.

The Longitude of Ascending Node of the object is 323.63466 degrees. The Argument of Perihelion is 114.1359. It is the angle along the orbit of a planet or other Solar System object as measured from the ascending node (analogous to right ascension and longitude) Ref:Hawaii.

The mean anomoly is 239.28737, is the angular distance of the planet from the perihelion or aphelion. Ref:Dictionary.The Semi-Major Axis of the orbit is 2.8606931, which is the furthest point from the centre to the edge of an elliptical point.

The approximate diameter of Ida is 58x23 km.

The orbital inclination, the angle at which Ida orbits in relation to the orbital plane is 1.1302 degrees. The orbital eccentricity is 0.0429958, it is the degree at which Ida orbits close to a circular (0) orbit as opposed to an elliptical (1) orbit.

Ida is the first known asteroid that to be discovered that has a moon called Dactyl. The smaller object in the picture is probably Dactyl. Twitter. The number 243 refers to the fact that it was the 243rd asteroid to be discovered since they were first discovered at the beginning of the 19th Century.

It was only in February 1994 that the discovery of a moon orbiting an asteroid was released to the public. The discovery had been made after studying pictures that had been taken of the asteroid on August 28th the preceeding year. Federal University of Rio Grande, Brazil

Ida was named after a nymph in Greek mythology who was tasked with looking after a young infant Zeus with her sister Adrasteia. The Dactyl comes from the mythical creatures that lived on Mount Ida on the island of Crete. Ref: N.A.S.A.

Path of Ida Orbit

If the white lines are above, then the path of the object is under the ecliptic. If the white lines are below, the path is above the ecliptic. This refers to the Inclination of the object. The image was created using N.A.S.A. Solar System Dynamics.

Path of Ida Orbit

Ida Facts

Mass (kg)100
Orbital Period4.84
Rotation Period4.633 Hours
Absolute Magnitude9.94
Longitude Of Ascending Node323.63466
Argument of Perihelion114.1359
Mean Anomoly239.28737
Semi-Major Axis 2.8606931
Approx. Diameter58x23
Orbital Inclination (degrees)1.1302
Orbital Eccentricity0.0429958

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