Spacecraft that landed on comet finally wakes up

BERLIN — To scientists’ relief and delight, the Philae spacecraft that landed on a comet last fall has woken up and communicated with Earth after seven long months of silence, the European Space Agency announced Sunday.

Philae became the first spacecraft to settle on a comet when it touched down on icy 67P/Churyumov-Gerasimenko in November. But the solar-powered probe came down with a bounce and ended up in the shadow of a cliff instead of in direct sunlight.

As a result, Philae managed to conduct experiments and send data to Earth for only about 60 hours before its batteries ran out and it was forced to shut down its systems and go silent.

Scientists had hoped the probe would wake up again as the comet approached the sun, enabling Philae’s solar panels to soak up enough light to charge the craft’s main battery. But there were fears its mission would be cut short.

Those fears were dismissed at 10:28 p.m. (2028 GMT; 4:28 p.m. EDT) on Saturday, when the lander sent a signal back to Earth.

“I’m not really surprised it happened, but if you wait for several months and then suddenly in the middle of the night you get a call saying, ‘We have a signal from Philae,’ it’s exciting,” said Stephan Ulamec, project manager at the German Aerospace Center, or DLR. “We’re very happy.”

The brief burst of communication contained 300 packages of data that were relayed by the probe’s mother ship, Rosetta, which is orbiting the comet.

“We only received data for about 85 seconds. These data are housekeeping and system data from the lander,” Ulamec said. But it was enough to tell scientists that the probe is doing well and getting sufficient sunlight to keep communicating.

Ulamec said the probe appears to have been awake for several days before it called home.

Scientists will now work to change Rosetta’s orbit so that the link to the lander lasts longer and they can start sending commands for it to carry out new measurements. The next opportunity to communicate with Philae should come on Sunday night, Ulamec said.

Scientists also hope that Philae’s restart will allow them to pinpoint where on the 2.5-mile (4-kilometer)-wide comet the washing machine-size probe landed. Its exact location has been a mystery.

On Aug. 13, the comet will reach the point at which it is closest to the sun before swinging back out again. Ulamec said the lander should get enough sunlight to operate until October, when it will once again fall silent, possibly forever.

Associated Press
Share
Published by
Associated Press

Recent Posts

Environmental advocates, Russian bathhouse challenge India Basin development

Environmental advocates and a Russian bathhouse have filed appeals of a massive India Basin development project in Hunters Point that…

38 mins ago

Heated exchange over race erupts between two District 10 supervisorial candidates

A heated exchange over race erupted Thursday between a white candidate and a black candidate vying for the District 10…

14 hours ago

Films opening Friday, Sept. 21, 2018

Blaze: Based on a true story, the film by Ethan Hawke is inspired by the life of Blaze Foley (Ben…

15 hours ago

PETA demonstrates against leather outside Levi’s headquarters

Campaigners with People for the Ethical Treatment of Animals demonstrated outside Levi's corporate headquarters near the Embarcadero to protest the…

19 hours ago

Mystery backers of Trauss, Johnson drop $100k into D6 race

A cool $100,000 just dropped like a thud into the hotly contested District 6 supervisors race, aimed squarely at taking…

21 hours ago

Athletics demolish Angels in record-setting 21-3 rout

By Alex Hall Special to S.F. Examiner OAKLAND -- The Oakland Athletics have one of the five best offenses in…

23 hours ago