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{{#invoke:Infobox|infobox}} 139 Juewa ({{#invoke:IPAc-en|main}} 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).<ref>Lutz D. Schmadel, Dictionary of Minor Planet Names, p. 28.</ref>

There have been three reported stellar occultations by Juewa, most recently on 26 September 2007.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

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.<ref name="Ostro1985"/> Based upon radar data, the near surface solid density of the asteroid is 1.5{{#invoke:Su|main}} g cm−3.<ref name="Magri2001"/>


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