139 Juewa
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| 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 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 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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| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |