FIGURE 2. A remote quartet.

From the following article:

Planetary science: Pluto's expanding brood

Richard P. Binzel

Nature 439, 924-925(23 February 2006)

doi:10.1038/439924a

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Two Hubble Space Telescope images of the Pluto system taken three days apart, revealing the existence of two smaller satellites, P1 and P2, in addition to Charon (discovered in 1978). P1 is the farther of the two newcomers from the system's centre of gravity, which lies just above the surface of Pluto. It completes just one orbit for every six of Charon's; P2 completes about one-and-a-half in the same time.

NASA/ESA/HST

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