Hubble's Latest Look at Pluto's Moons Supports a Common Birth

This pair of NASA/ESA Hubble Space Telescope images shows the motion of Pluto's satellites between February 15th and March 2nd, 2006. Both images were taken through a red filter (F606W) using the High Resolution Channel (HRC) of the Advanced Camera for Surveys (ACS). During this 15-day period, Pluto's newly-discovered satellite S/2005 P 2 (P2 for short) moved counterclockwise from the noon position to the 5 o'clock position, while the other newly-discovered satellite S/2005 P 1 (P1 for short) moved counterclockwise from the 1 o'clock position to the 7 o'clock position. During that same period, Pluto's much larger and closer moon, Charon, started near the 2 o'clock position, made more than two complete counterclockwise revolutions around Pluto, and ended up near the 10 o'clock position. The motions of P1 and P2 are in excellent agreement with the predicted motions based on earlier Hubble observations, thereby confirming that P1 and P2 are orbiting Pluto in the same plane as Charon's orbit, as expected if all three moons were created during a single, giant impact event.


NASA, ESA, H. Weaver (Johns Hopkins University/Applied Physics Lab), A. Stern (Southwest Research Institute), and the HST Pluto Companion Search Team

About the Image

NASA press release
NASA caption
Release date:10 March 2006, 15:00
Size:3000 x 2400 px

About the Object

Name:Charon, Hydra, Nix, Pluto
Type:• Solar System : Planet : Satellite
• Solar System : Interplanetary Body : Dwarf planet

Image Formats

Large JPEG
529.1 KB
Screensize JPEG
105.2 KB


Colours & filters

435 nm Hubble Space Telescope
606 nm Hubble Space Telescope

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