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221 Eos

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Asteroid in the Asteroid belt

221 Eos
Discovery
3D model based onlightcurve data
Discovered by	Johann Palisa
Discovery date	18 January 1882
Designations
MPC designation	(221) Eos
Pronunciation	/ˈiːɒs/^[1]
Named after	Eos
Alternative designations	A882 BA
Minor planet category	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 AU (497.40 Gm)
Perihelion	2.69594 AU (403.307 Gm)
Semi-major axis	3.01044 AU (450.355 Gm)
Eccentricity	0.10447
Orbital period (sidereal)	5.22yr (1907.8d)
Averageorbital speed	17.16 km/s
Mean anomaly	66.5202°
Mean motion	0° 11^m 19.284^s / day
Inclination	10.880°
Longitude of ascending node	141.845°
Argument of perihelion	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]
Meandensity	10.10 ± 1.74 g/cm³^[4]
Synodic rotation period	10.443 h (0.4351 d)
Geometric albedo	0.1400±0.010
Spectral type	K
Absolute magnitude (H)	7.67

221 Eos is a largemain-belt asteroid that was discovered by Austrian astronomerJohann Palisa on January 18, 1882, inVienna. In 1884, it was named afterEos, theGreek goddess of the dawn, to honour the opening of a newobservatory that was hoped to bring about a new dawn for Viennese astronomy.^[5]

The asteroid is orbiting theSun with asemimajor axis of3.01 AU, aperiod of 5.22 years, and aneccentricity of 0.1. Theorbital plane is inclined by 10.9° to theplane of the ecliptic. It has a mean cross-section of 104 km,^[3] and is spinning with arotation period of 10.4 hours. Based upon its spectral characteristics, this object is classified as aK-type asteroid. The orbital properties show it to be a member of the extensiveEos asteroid family, which is named after it.^[6] The spectral properties of the asteroid suggest it may have come from apartially differentiated parent body.^[7]

^Noah Webster (1884)A Practical Dictionary of the English Language
^"Eoan".Oxford English Dictionary (Online ed.).Oxford University Press. (Subscription orparticipating institution membership required.)
^^a ^b ^c"221 Eos".JPL Small-Body Database.NASA/Jet Propulsion Laboratory. Archived fromthe original on 13 September 2020. Retrieved12 May 2016.
^^a ^b ^cCarry, 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.

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220 Stephania 221 Eos 222 Lucia

Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

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Authority control databases	JPL SBDB MPC

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