139 Juewa
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Discovery
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| Discovered by | James Craig Watson |
| Discovery date | October 10, 1874 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 488.346 Gm (3.264 AU) |
| Perihelion | 344.626 Gm (2.304 AU) |
| Semi-major axis | 416.486 Gm (2.784 AU) |
| Eccentricity | 0.173 |
| Orbital period | 1696.721 d (4.65 a) |
| Average orbital speed | 17.72 km/s |
| Mean anomaly | 35.886° |
| Inclination | 10.902° |
| Longitude of ascending node | 2.014° |
| Argument of perihelion | 166.350° |
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Physical characteristics
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| Dimensions | 156.6 km |
| Mass | 4.0×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0438 m/s² |
| Escape velocity | 0.0828 km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~167 K |
| Spectral type | CP |
| Absolute magnitude | 7.78 |
139 Juewa (pronounced /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.
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139 Juewa
