View Full Version : Sedna Probably Doesn't Have a Moon

2005-Sep-09, 05:14 AM
SUMMARY: When the planetoid Sedna was discovered last year, astronomers noticed that it had a very slow rotation speed, only turning once every 20 days. One way to slow the rotation of a planet is through the interaction of a moon, but detailed observations of Sedna with Hubble failed to turn up any evidence of a satellite. New observations by astronomers with the Harvard-Smithsonian Center for Astrophysics have revised Sedna's rotation speed to once every 10 hours, which is what you'd expect for an object this size. No moon is necessary.

View full article (http://www.universetoday.com/am/publish/sedna_no_moon.html)
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