13 Egeria

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13 Egeria Astronomical symbol of 13 Egeria
13Egeria (Lightcurve Inversion).png
A three-dimensional model of 13 Egeria based on its light curve.
Discovery
Discovered by Annibale de Gasparis
Discovery date November 2, 1850
Designations
Pronunciation /ᵻˈdʒɪəriə/ i-JEER-ee-ə
none
Main belt
Orbital characteristics[1]
Epoch July 14, 2004 (JD 2453200.5)
Aphelion 417.953 Gm (2.794 AU)
Perihelion 352.719 Gm (2.358 AU)
385.336 Gm (2.576 AU)
Eccentricity 0.085
Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).
18.56 km/s
339.787°
Inclination 16.540°
43.305°
81.401°
Physical characteristics
Dimensions 214.8×192[2]
207.6 ± 8.3 km (IRAS)[1]
Mass 1.63×1019 kg[3]
Mean density
 3.46±0.79 g/cm³[3]
≈0.0580 m/s²
≈0.1098 km/s
0.2935 d[4]
(7.045 h)[1]
Albedo 0.083[1][5]
Temperature ~174 K
Spectral type
 G-type asteroid[1]
9.71 to 12.46[6]
6.74[1]

13 Egeria is a large main-belt G-type asteroid.[7] 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.[8]

OCCULT4 visualization of 13 Egeria occultation event of January 22, 2008

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.[2] The result showed that Egeria presented an approximately circular profile to Earth of 214.8×192 km, well in agreement with the 1992 occultation.[citation needed] It has also been studied by radar.[9]

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.[10] Spectral analysis of Egeria shows it to be unusually high in water content, 10.5–11.5% water by mass.[11] This makes Egeria a prominent candidate for future water-mining ventures.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found. (Chords)
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ apmag 9.71 (2061-Nov-06) to 12.46 (1990-Mar-12) JPL Horizons daily output for 1950 to 2099
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ http://www.lpi.usra.edu/meetings/lpsc2002/pdf/1414.pdf

External links

  • JPL Ephemeris
  • Lua error in package.lua at line 80: module 'strict' not found. (displays Elong from Sun and V mag for 2011)
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