(9921) 1981 EO18

Infobox Planet
minorplanet = yes
width = 25em
bgcolour = #FFFFC0
apsis =
name = mp|(9921) 1981 EO|18
symbol =


caption = Orbit of mp|(9921) 1981 EO|18 (blue), planets (red) and the Sun (black). The outermost planet visible is Jupiter.
discovery = yes
discovery_ref =
discoverer = S. J. Bus
discovered = March 2, 1981
designations = yes
mp_name = mp|(9921) 1981 EO|18
alt_names =
mp_category =
orbit_ref =
epoch = October 27, 2007
aphelion = 2.5177340 AU
perihelion = 2.2375754 AU
semimajor = 2.3776547 AU
eccentricity = 0.0589149
period = 1339.1264937 d
avg_speed =
inclination = 2.39925°
asc_node = 331.52802°
mean_anomaly = 202.94141°
arg_peri = 88.95675°
satellites =
physical_characteristics = yes
dimensions = ~12.3 km [cite web|url = http://www.iop.org/EJ/article/1538-3881/123/2/1056/FP206.txt?request-id=ZkkEm1jA3BGTV3i82wi7Kg|title = The supplemental IRAS minor planet survey (SIMPS)|author = Tedesco E.F., Noah P.V., Noah M., Price S.D.]
mass =
density =
surface_grav =
escape_velocity =
sidereal_day =
axial_tilt =
pole_ecliptic_lat =
pole_ecliptic_lon =
albedo = ~0.01
temperatures=yes
temp_name1 = Kelvin
mean_temp_1 =
max_temp_1 =
temp_name2 = Celsius
max_temp_2 =
spectral_type =
abs_magnitude = 14.3

mp|(9921) 1981 EO|18 is a main belt asteroid. It orbits the Sun once every 3.67 years. [cite web|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=9921|title = 9921 (1981 EO18)|work = JPL Small-Body Database Browser|publisher = JPL/NASA|accessdate=2008-01-31]

Discovered on March 2, 1981 by Schelte Bus at the Siding Spring Observatory, it was given the provisional designation "mp|1981 EO|18". [(9921) 1981 EO18 "Minor Planet Center's Minor Planet Ephemeris Service"]

References