It looks like an audacious plan to recover use of a 36-year-old satellite has ultimately failed as ISEE-3's thrusters have stopped responding to commands. Still, it's awesome that the attempt was made, and even cooler than it was done by a group of enthusiasts rather than a government team.
A team of space enthusiasts recently got permission from NASA to reconnect with the old spacecraft as it approached Earth. The idea was to put it on a new course so that it wouldn't just fly past. Instead, it would be commanded to go to a new orbit and join younger satellites in monitoring space weather.
On Tuesday, and then again Wednesday, the volunteer group sent commands to fire ISEE-3's engines again and again.
"And our first series of burns, we thought went OK," says Keith Cowing, a former NASA guy who is one of the leaders of the volunteer group -- the ISEE-3 Reboot Project. "And then when we went to the second set, pretty much nothing happened. And we tried it again, and nothing happened."