> Does the comet actually have enough gravity to make an orbit happen or is the orbit completely artificial? Yes it does. Rosetta is now at 100 km distance wh

> Does the comet actually have enough gravity to make an orbit happen or is the orbit completely artificial? Yes it does. Rosetta is now at 100 km distance while they are trying to figure out the mass and the mass distribution of the comet (unknown at this time!), and will eventually settle in a 20 km orbit, finally 10 km, around the comet. This isn't going to be easy, see elsewhere ITT for some detailed discussion.