221 Eos

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 | name=221 Eos
discoverer=Johann Palisa
discovered=January 18, 1882
alt_names="n/a"
mp_category=Main belt (Eos)
epoch=30 January, 2005 (JD 2453400.5)
semimajor=450.508 Gm (3.011 AU)
perihelion=404.104 Gm (2.701 AU)
aphelion=496.912 Gm (3.322 AU)
eccentricity=0.103
period=1908.778 d (5.23 a)
inclination=10.887°
asc_node=141.959°
arg_peri=196.03°
mean_anomaly=351.618°
avg_speed=17.16 km/s
dimensions=104.0 km
mass="unknown"
density="unknown"
surface_grav="unknown"
escape_velocity="unknown"
rotation=10.436 h
spectral_type=K
abs_magnitude=7.67
albedo=0.140
single_temperature="unknown"

221 Eos is a rather large main belt asteroid. It is classified as a K-type asteroid.

The extensive Eos asteroid family is named after it.

It was discovered by Johann Palisa on January 18, 1882 in Vienna and was named after Eos, Greek goddess of dawn.

References

* [ftp://ftp.lowell.edu/pub/elgb/astorb.html The Asteroid Orbital Elements Database]
* [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html Minor Planet Discovery Circumstances]
* [http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT Asteroid Lightcurve Data File]