139 Juewa
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Discovery | |
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Discovered by: | James Craig Watson |
Discovery date: | October 10, 1874 |
Orbital characteristics | |
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) |
Avg. orbital speed: | 17.72 km/s |
Mean anomaly: | 35.886° |
Inclination: | 10.902° |
Longitude of ascending node: | 2.014° |
Argument of perihelion: | 166.350° |
Physical characteristics | |
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: | ? |
Absolute magnitude: | 7.78 |
139 Juewa is a very big and dark Main belt asteroid. It is probably made of carbonate. It was the first asteroid found from China, in Beijing. It was found by the visiting American astronomer James Craig Watson on October 10, 1874; Watson was in China to see the transit of Venus. Watson asked his hosts to name the asteroid, and they called it 瑞華, which in modern pinyin would be represented in letters as ruìhuá, but was written Juewa according to the spelling conventions of the time. The full name was 瑞華星, which means "Star of China’s Fortune". There are three reported stellar occultations by Juewa.
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138 Tolosa | 139 Juewa | 140 Siwa
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Near-Earth asteroids · Main belt · Jupiter Trojans · Neptune Trojans · Comets · Kuiper belt · Oort cloud |