PIA17801: Hubble Finds 'Tenth Planet' is Slightly Larger than Pluto (Artist Concept)

Hubble Finds ‘Tenth Planet’ is Slightly Larger than Pluto (Artist Concept)


This is an artist's concept of Kuiper Belt object 2003 UB313 (nicknamed "Xena") and its satellite "Gabrielle."

Ground-based observations suggested that Xena was about 30 percent greater in diameter than Pluto, but Hubble's Advanced Camera for Surveys images, taken on Dec. 9 and 10, 2005, yielded a diameter of 1,490 miles (with an uncertainty of 60 miles) for Xena. Pluto's diameter, as measured by Hubble, is 1,422 miles.

Xena is the large object at the bottom of this artist's concept. A portion of its surface is lit by the Sun, located in the upper left corner of the image. Xena's companion, Gabrielle, is located just above and to the left of Xena.

Cataloging Keywords:

Name Value Additional Values
Target Pluto Sun
System Pluto Kuiper Belt
Target Type Dwarf Planet Sun, TNO
Mission Hubble Space Telescope (HST)
Instrument Host
Host Type
Extra Keywords Artwork, Color
Acquisition Date
Release Date 2006-04-11
Date in Caption
Image Credit NASA/ESA/STScI
Source photojournal.jpl.nasa.gov/catalog/PIA17801
Identifier PIA17801