(153) Hilda

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(153 ) Hilda is an asteroid of the outer main asteroid belt, which was discovered on November 2, 1875 by Johann Palisa. Of the heavenly bodies was named to commemorate the eldest daughter of the astronomer Theodor von Oppolzer, which was one year before died.

Hilda moves between 3,423 ( perihelion ) astronomical units to 4,551 astronomical units ( aphelion ) in 7.96 years of the sun. The orbit is inclined 7.839 ° to the ecliptic, the orbital eccentricity is 0.141.

Hilda has a diameter of 171 km. It has a dark carbon-rich surface with an albedo of 0.062. In about 5 hours and 7 minutes to rotate around its own axis.

The end of 2002 was observed by Japan from an occultation. Hilda moved here (as seen from the Earth ) just in front of a star over and obscured its light. Could be concluded on the basis of the different course of the light curve at different observatories that Hilda is a round body.

Hilda group

Hilda is the namesake of a group of asteroids, which move in an orbital resonance of 3:2 with the planet Jupiter around the Sun. A mean solar distance from 3.7 to 4.2 AE, an orbital eccentricity common feature is smaller than 0.3, and an inclination less than 20 °. If you look at the distribution of the Hilda group, one can observe a triangle, which with Jupiter ( near the center of one of the edges is ) revolves. This is a dynamic phenomenon which is caused by the 3:2 resonance, because of course none of the asteroid is moving on a triangular path. But their ellipses are temporally and spatially so intertwined that adjusts always a triangular distribution of the Hilda group.