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Artist’s Concept of Neptune’s Moon Hippocamp

Artist's Concept of Neptune's Moon Hippocamp
This is an artist's concept of the tiny moon Hippocamp that was discovered by the Hubble Space Telescope in 2013. Only 20 miles across, it may actually be a broken-off fragment from a much larger neighboring moon, Proteus, seen as a crescent in the background. This is the first evidence for a moon being an offshoot from a comet collision with a much larger parent body.
  • Release Date
    February 20, 2019
  • Science Release
    Tiny Neptune Moon Spotted by Hubble May Have Broken from Larger Moon
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  • Credit
    NASA, ESA, and J. Olmsted (STScI)

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Neptune's Inner Moons and Their Diameters

Neptune's Inner Moons and Their Diameters

This diagram shows the orbital positions of Neptune's inner moons, which range in size from 20 to 260 miles across. The outer moon Triton was captured from the Kuiper belt many billions of years ago. This would have torn up Neptune's original satellite system. Triton settled...

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Last Updated
Mar 28, 2025
Contact
Media

Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov

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