Re: 10,000ths of a radian per second
That's the launch mass, including propellant. ESA's "fact sheet" says the "science payload" is 209kg. I'm assuming that is the actual orbiter, minus the launch vehicle, but I could be misreading it.
My point was that 1G is more than you might think, and there is no need to accelerate anything at that kind of thrust for any amount of time, as you can more efficiently use a much lower thrust for longer if you have plenty of time to do so. One of the characteristics of space is that things are a long away apart (cataclysmic events aside), so you do have plenty of time to do that acceleration.