221 Eos
![]() 3D model based on lightcurve data | |
Discovery | |
---|---|
Discovered by | Johann Palisa |
Discovery date | 18 January 1882 |
Designations | |
(221) Eos | |
Pronunciation | /ˈiːɒs/[1] |
Named after | Eos |
A882 BA | |
Main belt (Eos) | |
Adjectives | Eoan /iːˈoʊ.ən/[2] |
Orbital characteristics[3] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 130.21 yr (47561 d) |
Aphelion | 3.3249 |
Perihelion | 2.69594 |
3.01044 | |
Eccentricity | 0.10447 |
5.22 yr (1907.8 d) | |
Average orbital speed | 17.16 km/s |
66.5202° | |
0° 11m 19.284s / day | |
Inclination | 10.880° |
141.845° | |
193.56° | |
Physical characteristics | |
Dimensions | 103.87±3.6 km[3] 103.52 ± 5.60 km[4] |
Mass | (5.87 ± 0.34) × 1018 kg[4] |
Mean density | 10.10 ± 1.74 g/cm3[4] |
10.443 h (0.4351 d) | |
0.1400±0.010 | |
K | |
7.67 | |
221 Eos is a large main-belt asteroid that was discovered by Austrian astronomer Johann Palisa on January 18, 1882, in Vienna. In 1884, it was named after Eos, the Greek goddess of the dawn, to honour the opening of a new observatory that was hoped to bring about a new dawn for Viennese astronomy.[5]
The asteroid is orbiting the Sun with a semimajor axis of 3.01
References
[edit]- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ "Eoan". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c "221 Eos". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 13 September 2020. Retrieved 12 May 2016.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- ^ Schmadel, Lutz (2003), Dictionary of Minor Planet Names, Springer Science & Business Media, p. 35, ISBN 9783540002383.
- ^ Veeder, G. J.; et al. (March 1995), "Eos, Koronis, and Maria family asteroids: Infrared (JHK) photometry", Icarus, 114 (1): 186–196, Bibcode:1995Icar..114..186V, CiteSeerX 10.1.1.31.2739, doi:10.1006/icar.1995.1053.
- ^ Mothé-Diniz, T.; Carvano, J. M. (November 2005), "221 Eos: a remnant of a partially differentiated parent body?", Astronomy and Astrophysics, 442 (2): 727–729, Bibcode:2005A&A...442..727M, doi:10.1051/0004-6361:20053551.
External links
[edit]- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 221 Eos at AstDyS-2, Asteroids—Dynamic Site
- 221 Eos at the JPL Small-Body Database