NASA Reconnects With ‘Lost’ STEREO-B Satellite

NASA lost contact with its STEREO-B spacecraft twenty-two months ago during a routine 72-hour test. On Sunday, the spacecraft reconnected with NASA roughly 189 million miles away from Earth. While that would seem like a cause for celebration, “the very hard and scary work is just the beginning, says Stereo project scientist Joe Gurman, as the agency has to turn on the computer to learn more about the current state of the spacecraft — a process that may make the craft lose contact with them again. Slashdot user bongey writes: NASA may have only two minutes or less to fix a STEREO-B satellite before the computer causes it to lose contact again. NASA lost contact with their STEREO-B satellite nearly twenty-two months ago when performing a routine test. NASA scientists are afraid to turn on the computer at this point because it may cause them to lose contact again. A more detailed technical summary can be found here. “We have something like two minutes between when STEREO-B receives the command to boot up one of its computers and when it starts doing what we don’t want it to do,” Gurman said. Business Insider writes, “Making matters worse, it takes about 20 seconds to send commands to the spacecraft — a data rate that makes a dial-up modem seem lightning fast.”


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