139 Juewa
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | October 10, 1874 |
| Designations | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 488.346 Gm (3.264 AU) |
| Perihelion | 344.626 Gm (2.304 AU) |
| 416.486 Gm (2.784 AU) | |
| Eccentricity | 0.173 |
| 1696.721 d (4.65 a) | |
|
Average orbital speed
|
17.72 km/s |
| 35.886° | |
| Inclination | 10.902° |
| 2.014° | |
| 166.350° | |
| Physical characteristics | |
| Dimensions | 161.43±7.38 km[2] |
| Mass | (5.54±2.20)×1018 kg[2] |
|
Mean density
|
2.51±1.05 g/cm3[2] |
| 0.0438 m/s² | |
| 0.0828 km/s | |
| Albedo | 0.0444±0.0164[3] |
| Temperature | ~167 K |
|
Spectral type
|
CP (Tholen)[3] |
| 7.924[3] | |
139 Juewa (/dʒuːˈeɪwɑː/ jew-AY-wah) 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.
Juewa was discovered from Beijing by the visiting American astronomer James Craig Watson on 10 October 1874; Watson was in China to observe the transit of Venus. Watson asked Prince Gong to name the asteroid. Gong's choice was 瑞華星 (roughly, "Star of China’s Fortune"). Watson used only the first two characters, transliterating them as Juewa according to the conventions of his time (in modern pinyin, it would be transliterated as ruìhuá).[4]
There have been three reported stellar occultations by Juewa, most recently on 26 September 2007.[5]
13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 172 km.[6] Based upon radar data, the near surface solid density of the asteroid is 1.5+0.5
−0.5 g cm−3.[7]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found. See Table 4.
- ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names, p. 28.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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