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A new analysis in 2013 of old Hubble Space Telescope images from 2004 has revealed a 12-mile-diameter moon of Neptune, temporarily known as S/2004 N1 (where the S/ means “satellite”).  Its orbital period is 23 hours.

Mark Showalter of the SETI Institute in Mountain View, Calif., discovered the moon on July 1, while studying the faint ring-arcs of Neptune. It is so small and dim that it is roughly one hundred million times fainter than the faintest star that can be seen with the naked eye.


Credit: NASA, ESA, and M. Showalter (SETI Institute)

Read the full story at the HubbleSite, Scientific American, or


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