An interesting session with frustratingly faint sound:
http://cornellmediasite.cit.cornell.edu/me...f0-671231a1f6b3
I particularly enjoyed the presentation on the search for new Sednas 67 minutes in. If more could be found then different origin scenarios would reveal themselves through the ststistical distributions of inclinations and eccentricities (nice diagrams). However no more examples of the class have turned up in surveys. Even so, a surprising amount can be deduced from just the Sedna data and from the failure of surveys to detect others. An impressive amount of statistics from only one object (and I'm not being sarcastic).