(139) Juewa
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Asteroid (139) Juewa |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.782 AU |
| eccentricity | 0.175 |
| Perihelion - aphelion | 2.296 AU - 3.268 AU |
| Inclination of the orbit plane | 10.9 ° |
| Length of the ascending node | 1.9 ° |
| Argument of the periapsis | 166.1 ° |
| Time of passage of the perihelion | March 4, 2011 |
| Sidereal period | 4 a 233 d |
| Mean orbital velocity | 17.7 km / s |
| Physical Properties | |
| Medium diameter | 157 km |
| Albedo | 0.0557 |
| Rotation period | 20 h 59 min |
| Absolute brightness | 7.78 likes |
| history | |
| Explorer | JC Watson |
| Date of discovery | October 10, 1874 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(139) Juewa is an asteroid of the main asteroid belt discovered by James Craig Watson on October 10, 1874 .
Watson was a participant in an expedition that traveled to the Chinese Empire on the occasion of the Venus transit of 1874 and was supposed to observe the transit from Beijing . He discovered the asteroid while preparing to observe the event. He asked the Chinese hosts to give the asteroid a name, which they called it 瑞華. In a contemporary translation , the name would be ruìhuá - according to the Juewa convention at the time . The full name was 瑞華 星, which means “China's lucky star”.
Juewa moves between 2,304 astronomical units ( perihelion ) to 3,263 astronomical units ( aphelion ) in 4.64 years around the sun . The orbit is inclined 10.904 ° to the ecliptic , the orbit eccentricity is 0.172.
Juewa has a diameter of 157 km. It has a dark carbon-rich surface with an albedo of 0.056. It rotates on its own axis in around 21 hours.