Egeria ( minor planet designation: 13 Egeria) is a large

main-belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

G-type asteroid G-type asteroids are a relatively uncommon type of carbonaceous asteroid that makes up approximately 5% of asteroids. The most notable asteroid in this class is 1 Ceres. Characteristics Generally similar to the C-type objects, but contain a ...

. It was discovered by

Annibale de Gasparis Annibale de Gasparis (9 November 1819, Bugnara – 21 March 1892, Naples; ) was an Italian astronomer, known for discovering asteroids and his contributions to theoretical astronomy. Biography De Gasparis was born in 1819 in Bugnara to Ang ...

on November 2, 1850. Egeria was named by

Urbain Le Verrier Urbain Jean Joseph Le Verrier FRS (FOR) H FRSE (; 11 March 1811 – 23 September 1877) was a French astronomer and mathematician who specialized in celestial mechanics and is best known for predicting the existence and position of Neptune usin ...

, whose computations led to the discovery of Neptune, after the mythological nymph Egeria of

Aricia, Italy Ariccia (Latin: ''Aricia'') is a town and ''comune'' in the Metropolitan City of Rome, central Italy, southeast of Rome. It is in the Alban Hills of the Lazio (Latium) region and could be considered an extension of Rome's southeastern suburbs. One ...

, the wife of Numa Pompilius, second king of Rome. 20080122 13EgeriaOccultationProfile

Egeria occulted a star on January 8, 1992. Its disc was determined to be quite circular (217×196 km). On January 22, 2008, it occulted another star, and this occultation was timed by several observers in

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ke ...

and

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

, coordinated by the IOTA Asteroid Occultation Program. The result showed that Egeria presented an approximately circular profile to Earth of 214.8×192 km, well in agreement with the 1992 occultation. It has also been studied by

radar Radar is a detection system that uses radio waves to determine the distance ('' ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, we ...

. In 1988 a search for satellites or dust orbiting this asteroid was performed using the

UH88 The University of Hawai'i 88-inch (2.24-meter) telescope—called UH88, UH2.2, or simply 88 by members of the local astronomical community—is situated at the Mauna Kea Observatories and operated by the University's Institute for Astronomy. It ...

telescope at the

Mauna Kea Observatories The Mauna Kea Observatories (MKO) are a group of independent astronomical research facilities and large telescope observatories that are located at the summit of Mauna Kea on the Big Island of Hawaiʻi, United States. The facilities are located ...

, but the effort came up empty. Spectral analysis of Egeria shows it to be unusually high in water content, 10.5–11.5% water by mass. This makes Egeria a prominent candidate for future water-mining ventures. A three-dimensional model of 13 Egeria based on its light curve

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* (displays Elong from Sun and V mag for 2011) * * {{DEFAULTSORT:Egeria 000013 Discoveries by Annibale de Gasparis Named minor planets 000013 000013 000013 18501102

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