139 Juewa

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=139 Juewa
discoverer=James Craig Watson
discovered=October 10, 1874
alt_names=
mp_category=Main belt
epoch=December 31, 2006 (JD 2454100.5)
semimajor=416.486 Gm (2.784 AU)
perihelion=344.626 Gm (2.304 AU)
aphelion=488.346 Gm (3.264 AU)
eccentricity=0.173
period=1696.721 d (4.65 a)
inclination=10.902°
asc_node=2.014°
arg_peri=166.350°
mean_anomaly=35.886°
avg_speed=17.72 km/s
dimensions=156.6 km
mass=4.0e|18 kg
density=? g/cm³
surface_grav=0.0438 m/s²
escape_velocity=0.0828 km/s
rotation=? d
spectral_type=CP
abs_magnitude=7.78
albedo=?
single_temperature=~167 K

139 Juewa (pronEng|ˈdʒweɪwɑː "jwey'-waa" ?) is a very large and dark Main belt asteroid. It is probably composed of primitive carbonaceous material. It was the first asteroid discovered from China, in Beijing. It was discovered by the visiting American astronomer James Craig Watson on October 10, 1874; Watson was in China to observe the transit of Venus. Watson asked his hosts to name the asteroid, and they called it 瑞華, which in modern pinyin would be transliterated as "ruìhuá", but was written Juewa according to the spelling conventions of the time. The full name was 瑞華星, or roughly "Star of China’s Fortune". There are three reported stellar occultations by Juewa.