Get node managed / unmanaged status

I would like to craft a SWIS query that will tell me whether or not a node is currently managed or unmanaged. So far I've found GroupStatus and StatusIcon in the Orion.Nodes table. These seem to show values of "Unmanaged.gif" if the node is unmanaged. But is there a more direct method? I expect there is an actual status value somewhere rather than the name of an icon.