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Gonggong and its moon Xiangliu (red circle) seen by the Hubble Space Telescope in 2010

While idly scanning trans-Neptunian objects & suchlike miscellaneous dwarf planets of the outer solar system, Ferrebeekeeper was stunned to see a familiar name–GongGong, the dark water dragon who messed up Chinese cosmology and nearly destroyed the world. In Chinese mythology, GongGong’s reign of chaos was stopped by the gentle creator goddess Nuwa. However, in order to repair the damage wrought by the naughty dragon, Nuwa was forced to jerryrig creation back together with turtle legs and river rocks (and the end result is decidedly more rickety than the original).

The dwarf world Gonggong was discovered by astronomers waaaaaaay back in 2007. Although it is not the most famous dwarf planet in the solar system, it is not inconsequential in size and has a diameter of 1,230 km (760 mi). Gonggong’s eccentric ecliptic orbit takes 550 Earth years and the planetoid rotates very slowly as well. At its perehelion (when it is closest to the sun) it is 55 AUs from Earth, however at its apehelion it is 101.2 AUs (1.514×1010 km) away from the gentle sun. Brrrr! Gonggong was last at perehelion fairly recently, in 1857, and now it is moving farther and farther away–so if you left your wallet there in 1857, you may just want to get a new one. The orbital diagram below shows the orbit of Gonggong (in yellow) contrasted with that of Eris.

Like the lozenge-world Haumea, Gonggong is a strange reddish pink color because of organic compounds known as tholins which cover its ancient ice. In some stories, the evil water dragon Gonggong had a copper head, so maybe the name suits it. Oh, also, in Chinese mythology GongGong has a sidekick, a wicked nine-headed demon named Xiangliu. Gonggong the planetoid has a tiny moon which bears this name. Finally, Chinese mythology is weirdly ambiguous about whether Nuwa and Zhu Rong finished off GongGong or whether he escaped to cause trouble another day. If I were hiding out from a bunch of quasi omnipotent Earth deities for thousands of years, I know where I would go!

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