Sedna Mystery Deepens With Hubble Images Of Farthest Planetoid: Sedna's existence was announced on March 15. Its discoverer, Mike Brown of the California Institute of Technology, Pasadena, Calif., was so convinced it had a satellite, that an artist's concept of Sedna released to the media included a hypothetical moon.
Brown's prediction was based on the fact, Sedna appears to have a very slow rotation that could best be explained by the gravitational tug of a companion object. Almost all other solitary bodies in the solar system complete a spin in a matter of hours.
“I'm completely baffled at the absence of a moon,” Brown said.
As you can see from this Hubble telescope photo, there is no sign of Sedna's moon at all. Nope. Can't see a thing.
