- 21148 Billramsey
Infobox Planet
minorplanet = yes
width = 25em
bgcolour = #FFFFC0
apsis =
name = Billramsey
symbol =
caption =
discovery = yes
discovery_ref =
discoverer =C. S. Shoemaker andE. M. Shoemaker
discovery_site = Palomar
discovered =April 16 ,1993
designations = yes
mp_name = 21148
alt_names = 1993 HN1
mp_category =
orbit_ref =
epoch =May 14 ,2008
aphelion = 3.1908172
perihelion = 2.1851260
semimajor =
eccentricity = 0.1870725
period = 1609.6647851
avg_speed =
inclination = 12.86499
asc_node = 159.70371
mean_anomaly = 154.89436
arg_peri = 36.52651
satellites =
physical_characteristics = yes
dimensions =
mass =
density =
surface_grav =
escape_velocity =
sidereal_day =
axial_tilt =
pole_ecliptic_lat =
pole_ecliptic_lon =
albedo =
temperatures=
temp_name1 =
mean_temp_1 =
max_temp_1 =
temp_name2 =
max_temp_2 =
spectral_type =
abs_magnitude = 14.121148 Billramsey (1993 HN1) is a
Main-belt Asteroid discovered onApril 16 ,1993 byC. S. Shoemaker andE. M. Shoemaker at Palomar.External links
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=21148+Billramsey JPL Small-Body Database Browser on 21148 Billramsey]
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