91 Aegina Explained

Minorplanet:yes
Background:
  1. D6D6D6
91 Aegina
Discoverer:Édouard Stephan
Discovered:4 November 1866
Mpc Name:(91) Aegina
Pronounced:[1]
Named After:Aegina
Adjective:Aeginetan [2]
Mp Category:Main belt
Epoch:31 December 2006 (JD 2454100.5)
Semimajor:387.64Gm
Perihelion:346.826Gm
Aphelion:428.453Gm
Eccentricity:0.105
Period:1523.5363NaN3
Inclination:2.109°
Asc Node:10.806°
Arg Peri:73.371°
Mean Anomaly:183.458°
Avg Speed:18.45 km/s
Dimensions:109.8 km
Mass:1.4 kg
Surface Grav:0.0307 m/s²
Escape Velocity:0.0580 km/s
Rotation:6.03 hours
Spectral Type:C
Abs Magnitude:8.84
Albedo:0.043 [3]

91 Aegina (from Latin Aegīna, Aegīnēta)[4] is a large main-belt asteroid. It was discovered by a French astronomer Édouard Jean-Marie Stephan on 4 November 1866. It was his second and final asteroid discovery. The first was 89 Julia. The asteroid's name comes from Aegina, a Greek mythological figure associated with the island of the same name.

This body is orbiting the Sun with a period of 4.17 years and an eccentricity of 0.105. The orbit of this object brings it to within 0.033AU of the dwarf planet Ceres, and the resulting gravitational interaction has been used to produce mass estimates of the latter. The cross-section size of the asteroid is 110 km and it has a rotation period of six hours. The surface coloring of 91 Aegina is very dark and this C-type asteroid has probably a primitive carbonaceous composition. Observation of absorption bands at wavelengths of 0.7 and 3μm indicate the presence of hydrated minerals and/or ice grains on the surface.

External links

Notes and References

  1. Noah Webster (1884) A Practical Dictionary of the English Language
  2. Figueira (1981) Aegina, society and politics
  3. http://www.psi.edu/pds/resource/albedo.html Asteroid Data Sets
  4. https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0059%3Aentry%3DAegina Charlton T. Lewis, Charles Short, A Latin Dictionary