55561

55561 is a minor planet in the asteroid belt, orbiting the Sun between Mars and Jupiter. It was discovered on September 24, 1991, by astronomers Carolyn S. Shoemaker and Eugene M. Shoemaker at the Palomar Observatory in California, USA. The asteroid is named after the year of its discovery, 1991.

55561 has an estimated diameter of about 10 kilometers (6.2 miles) and an orbital period of approximately 3.7 years. Its orbit is slightly elliptical, with an average distance from the Sun of about 2.8 astronomical units (AU). The asteroid's rotation period is not yet precisely determined, but it is believed to be relatively slow, similar to other asteroids in its size range.

The classification of 55561 is not yet definitive, but it is likely to be an S-type asteroid, which are composed mainly of silicate materials and nickel-iron. This classification is based on its spectral characteristics, which are similar to those of other S-type asteroids.

55561 is not currently known to pose any threat to Earth, as its orbit does not bring it close enough to our planet. However, like all asteroids, it is a potential target for future space missions, as it could provide valuable information about the early solar system and the formation of planets.