Back 139 جويوا Arabic 139 چويوا (كويكب) ARZ 139 Juewa AST (139) Жуйхуа Byelorussian (139) Juewa Catalan (139) Жуйхуа CE (139) Juewa German 139 Τζουέιγουα Greek 139 Juewa Esperanto (139) Juewa Spanish
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | 10 October 1874 |
| Designations | |
| (139) Juewa | |
| Pronunciation | English: /dʒuˈeɪwɑː/ joo-AY-wah Mandarin: [ɻwêɪxwǎ] |
| A874 TA | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 121.07 yr (44222 d) |
| Aphelion | 3.26884 AU (489.012 Gm) |
| Perihelion | 2.29261 AU (342.970 Gm) |
| 2.78073 AU (415.991 Gm) | |
| Eccentricity | 0.17553 |
| 4.64 yr (1693.7 d) | |
| 60.2817° | |
| 0° 12m 45.187s / day | |
| Inclination | 10.9127° |
| 1.83417° | |
| 165.566° | |
| Physical characteristics | |
| Dimensions | 148.3±4.3 km × 142.3±15.6 km |
| 151.116±1.596 km[1] 161.43±7.38 km[2] | |
| Mass | (5.54±2.20)×1018 kg[2] (3.262 ± 0.778/0.933)×1018 kg[3] |
Mean density | 2.51±1.05 g/cm3[2] 1.805 ± 0.430/0.516 g/cm3[3] |
Equatorial surface gravity | 0.0438 m/s² |
Equatorial escape velocity | 0.0828 km/s |
| 20.991 h (0.8746 d) | |
| 0.052±0.015[1] 0.0444±0.0164[4] | |
| Temperature | ~167 K |
| CP (Tholen)[4] | |
| 8.06,[1] 7.924[4] | |
| 139 Juewa | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Traditional Chinese | 瑞華星 | ||||||||||
| Simplified Chinese | 瑞华星 | ||||||||||
| Literal meaning | "Auspicious star of Huaxia" / "Star of China's fortune" | ||||||||||
| |||||||||||
139 Juewa (/dʒuˈeɪwɑː/ joo-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 the first two characters ('star' being redundant), transliterating them Juewa in Wade convention of the time. (In pinyin, 瑞華 is transliterated ruìhuá.)[5]
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Since 1988 there have been 8 reported stellar occultations by Juewa. From the occultation on 31 August 2013 the best fit ellipse measures 148.3±4.3 km × 142.3±15.6 km.[6]
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.[7] Based upon radar data, the near surface solid density of the asteroid is 1.5±0.5 g/cm3.[8]
- ^ a b c d Cite error: The named reference
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Pravec2012was invoked but never defined (see the help page). - ^ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 28. ISBN 978-3-540-00238-3.
- ^ "Asteroid Occultations". sbn.psi.edu. Retrieved 22 June 2018.
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