221 Eos

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221 Eos
Discovery
Discovered by Johann Palisa
Discovery date January 18, 1882
Designations
Named after
Eos
Minor planet category Main belt (Eos)
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion 496.912 Gm (3.322 AU)
Perihelion 404.104 Gm (2.701 AU)
450.508 Gm (3.011 AU)
Eccentricity 0.103
1908.778 d (5.23 a)
17.16 km/s
351.618°
Inclination 10.887°
141.959°
196.03°
Physical characteristics
Dimensions 103.52 ± 5.60[1] km
Mass (5.87 ± 0.34) × 1018[1] kg
Mean density
10.10 ± 1.74[1] g/cm3
10.436 h
Albedo 0.140
Spectral type
K
7.67

221 Eos /ˈɒs/ is a large main-belt asteroid that was discovered by Johann Palisa on January 18, 1882, in Vienna. In 1884, it was named after Eos, the Greek goddess of dawn, to honour the opening of a new observatory that was hoped to bring about a new dawn for Viennese astronomy.[2]

Based upon its spectral characteristics, this object is classified as a K-type asteroid. The orbital properties show it to be a member of the extensive Eos asteroid family, which is named after it.[3]

References[edit]

  1. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  2. ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.35
  3. ^ Veeder, G. J. et al. (March 1995), "Eos, Koronis, and Maria family asteroids: Infrared (JHK) photometry", Icarus 114: 186–196, Bibcode:1995Icar..114..186V, doi:10.1006/icar.1995.1053, CiteSeerX: 10.1.1.31.2739, retrieved 2013-04-06. 

External links[edit]