NASA Troubleshooting Glitch on Voyager 2

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NASA has commanded the famed Voyager 2 probe to send only information on its health and status after spotting a puzzling change in the spacecraft’s pattern of communication from the edge of the solar system.

The 33-year-old Voyager 2 spacecraft, which is currently 13.8 billion kilometers from Earth, is apparently still in good health, according to engineering data received May 1. But Voyager 2’s flight data system, which formats information before beaming it back to Earth, has experienced a hiccup that altered the pattern in which it sends updates home.

Because of that pattern change, mission managers can no longer decode the science data. The space probe and its twin Voyager 1 are flying through the bubble-like heliosphere, which marks the edge of the sun’s influence on the solar system.

The first hint of a problem came April 22, when engineers noticed the data pattern change. Since then, they have been working to fix the glitch and began sending commands back to Voyager 2 April 30.

Because Voyager 2 is so far from Earth, it takes 13 hours for a message to reach the spacecraft and another 13 hours for responses to come back to NASA’s Deep Space Network of listening antennas around the world.

“Voyager 2’s initial mission was a four-year journey to Saturn, but it is still returning data 33 years later,” said Voyager project scientist Ed Stone of the California Institute of Technology in Pasadena. “It has already given us remarkable views of Uranus and Neptune, planets we had never seen close-up before. We will know soon what it will take for it to continue its epic journey of discovery.”

Voyager 2 took a so-called grand tour of the solar system when it visited the gas giant planets Jupiter, Saturn, Uranus and Neptune in the 1980s, taking advantage of a rare planetary alignment that occurs once every 176 years.

NASA launched Voyager 2 Aug. 20, 1977, just two weeks before Voyager 1. Together, the two spacecraft are the most distant human-built objects in space. Voyager 1 is about 16.9 billion kilometers away from Earth and in perfect health, mission managers said.