221 Eos

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221 Eos
Discovery
Discovered by Johann Palisa
Discovery date 18 January 1882
Designations
Named after
Eos
Main belt (Eos)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 130.21 yr (47561 d)
Aphelion 3.3249 AU (497.40 Gm)
Perihelion 2.69594 AU (403.307 Gm)
3.01044 AU (450.355 Gm)
Eccentricity 0.10447
5.22 yr (1907.8 d)
17.16 km/s
66.5202°
0° 11m 19.284s / day
Inclination 10.880°
141.845°
193.56°
Earth MOID 1.68615 AU (252.244 Gm)
Jupiter MOID 2.02439 AU (302.844 Gm)
Jupiter Tisserand parameter 3.214
Physical characteristics
Dimensions 103.87±3.6 km[1]
103.52 ± 5.60 km[2]
Mass (5.87 ± 0.34) × 1018 kg[2]
Mean density
10.10 ± 1.74 g/cm3[2]
10.443 h (0.4351 d)
0.1400±0.010
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.[3]

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.[4]

References[edit]

  1. ^ a b "221 Eos". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336free to read, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.35
  4. ^ Veeder, G. J.; et al. (March 1995), "Eos, Koronis, and Maria family asteroids: Infrared (JHK) photometry", Icarus, 114, pp. 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]