Did the reaction wheel recover from this or is it dead? Article started by saying they used 3 so now only 2 are operational? Can they sustain the satellite with 2?
From what I gather it was just a radiation caused software glitch that momentarily shut it down.
> Integral has since remained under control, and from 27 September all systems are back online. Since 1 October, after an extended checkout, its instruments are back observing the high energy Universe.
Seems like they're back in shape.
As a comparison the Kepler telescope had 4 wheels, of which 2 eventually completely failed and they managed to get it into a neutrally stable orientation that could be managed with just the two and some thruster assistance. Until RCS ran out that is. 3 are generally the minimum you'd need to orient yourself in 3 axis, as one might expect.
