Girish Mahajan (Editor)

13 Egeria

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Discovered by  Annibale de Gasparis
Alternative names  none
Observation arc  60342 days (165.21 yr)
Discovered  2 November 1850
Orbits  Sun
Discovery date  2 November 1850
Minor planet category  Main belt
Orbital period  1,510 days
Discoverer  Annibale de Gasparis
Asteroid group  Asteroid belt
13 Egeria httpsuploadwikimediaorgwikipediacommonsthu
Pronunciation  /ᵻˈdʒɪəriə/ i-JEER-ee-ə
Discovery site  Astronomical Observatory of Capodimonte
Similar  Annibale de Gasparis discoveries, Other celestial objects

13 Egeria is a large main-belt G-type asteroid. It was discovered by A. de Gasparis on November 2, 1850. Egeria was named by Urbain Le Verrier, whose computations led to the discovery of Neptune, after the mythological nymph Egeria of Aricia, Italy, the wife of Numa Pompilius, second king of Rome.

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 and Arizona, 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.

In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, 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.

References

13 Egeria Wikipedia


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