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| Orbital characteristics 1 | |
|---|---|
| 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 | 156.6 km |
| Rotation period | 20.991 hours |
| Spectral class 5 | CPC-type asteroids are carbonaceous asteroids. They form 75% of known asteroids, and are extremely dark ( albedo 0. 03), similar to carbonaceous chondrite meteorites (types CI and CM). They dominate the outer belt beyond 2. These asteroids have approximatel |
| Abs. magnitudeIn astronomy, absolute magnitude is the apparent magnitude, m an object would have if it were at a standardized distance away. It allows the overall brightnesses of objects to be compared without regards to distance. Absolute Magnitude for stars M In stel 1 | 7.78 |
| AlbedoNote: This article discusses the physical or planetological property of albedo. For other usage, see Albedo (disambiguation). The albedo is a measure of reflectivity of a surface or body. It is the ratio of electromagnetic radiation reflected to the amoun 4 | 0.056 |
| History 2 | |
| Discoverer | J. C. WatsonJames Craig Watson ( January 28 1838 November 22 1880) was a Canadian- American astronomer born in the village of Fingal in Ontario, Canada. His family relocated to Ann Arbor, Michigan in 1850. He was the second director of Detroit Observatory (from 1863, 1874Events January 1 New York City annexes The Bronx January 23 Marriage of the Duke of Edinburgh, second son of Queen Victoria, to Grand Duchess Maria Alexandrovna of Russia, only daughter of Emperor Alexander III of Russia. January Signing of the Pangkor Tr |
139 Juewa is a very large and dark Main belt asteroidAn asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid , which are much smaller than planets. The asteroids are believed to be remnants of the protoplanetary disc which were no. 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.
Main Belt asteroids