133 Cyrene

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 | name=133 Cyrene
discoverer=James Craig Watson
discovered=August 16, 1873
alt_names=A910 NB; 1936 HO;
1948 QC; 1959 UR
mp_category=Main belt
epoch=July 14, 2004 (JD 2453200.5)
semimajor=457.505 Gm (3.058 AU)
perihelion=392.840 Gm (2.626 AU)
aphelion=522.169 Gm (3.490 AU)
eccentricity=0.141
period=1953.456 d (5.35 a)
inclination=7.233°
asc_node=319.246°
arg_peri=291.128°
mean_anomaly=224.793°
avg_speed=17.03 km/s
dimensions=66.6 km
mass=3.1×10¹⁷ kg
density=2.0? g/cm³
surface_grav=0.0186 m/s²
escape_velocity=0.0352 km/s
rotation=0.5295 d (12.708 h)
spectral_type=S ^{[http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT 1]}
abs_magnitude=7.98
albedo=0.256 ^{[http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html 2]}
single_temperature=~133 K

133 Cyrene is a fairly large and very bright main belt asteroid. It is an S-type.

It was discovered by J. C. Watson on August 16, 1873 and named after Cyrene, a nymph, daughter of king Hypseus and beloved of Apollo in Greek mythology.