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Encyclopedia > 139 Juewa
139 Juewa
Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Orbit type Main belt
Semimajor axis 2.784 AU
Perihelion distance 2.305 AU
Aphelion distance 3.264 AU
Orbital period 4.65 years
Inclination 10.90°
Eccentricity 0.172
Physical characteristics
Diameter 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) 156.6 km
Rotation period 20.991 hours
Spectral class 5 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT) CP
Abs. magnitude 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html) 7.78
Albedo 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) 0.056
History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer J. C. Watson, 1874


139 Juewa is a very large and dark Main belt asteroid. It is probably composed of primitive carbonaceous material.


It was the first asteroid discovered in 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 ruěhuá, 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.

 
 

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