“It did its grand tour past the planets and it just goes on, on this voyage of discovery.”

The farthest man-made object from Earth, at some 17.4 billion kilometres, Nasa’s Voyager 1 spacecraft is still performing acrobatics 30-odd years after it was launched.  From the BBC report

Voyager is executing a series of roll manoeuvres to get one of its instruments into the optimum position to measure particles sweeping away from the Sun.

Controllers at the US space agency’s Jet Propulsion Laboratory in Pasadena, California, report a perfect response from the probe.

“I liken Voyager to an old car,” said project manager Suzanne Dodds. “It’s got simple electronics, not a lot of fancy gadgets – but because of that it can operate for longer; it’s not as finicky.”

And as Voyager 1 passes through the heliosphere boundary – where Nasa’s IBEX spacecraft recently found unexpected evidence of structure – it’s still returning unique scientific data.  From the Nasa press release

In June 2010, when Voyager 1 was about 17 billion kilometers (about 11 billion miles) away from the sun, data from the Low Energy Charged Particle instrument began to show that the net outward flow of the solar wind was zero. That zero reading has continued since. The Voyager science team doesn’t think the wind has disappeared in that area. It has likely just turned a corner. But does it go up, down or to the side?

“Because the direction of the solar wind has changed and its radial speed has dropped to zero, we have to change the orientation of Voyager 1 so the Low Energy Charged Particle instrument can act like a kind of weather vane to see which way the wind is now blowing,” said Edward Stone, Voyager project scientist, based at the California Institute of Technology, Pasadena. “Knowing the strength and direction of the wind is critical to understanding the shape of our solar bubble and estimating how much farther it is to the edge of interstellar space.”

Voyager engineers performed a test roll and hold on Feb. 2 for two hours, 15 minutes. When data from Voyager 1 were received on Earth some 16 hours later, the mission team verified the test was successful and the spacecraft had no problem in reorienting itself and locking back onto its guide star, Alpha Centauri.

The Low Energy Charged Particle instrument science team confirmed that the spacecraft had acquired the kind of information it needed, and mission planners gave Voyager 1 the green light to do more rolls and longer holds. There will be five more of these maneuvers over the next seven days, with the longest hold lasting three hours 50 minutes. The Voyager team plans to execute a series of weekly rolls for this purpose every three months.

The success of the March 7 roll and hold was received at JPL at 1:21 a.m. PST (4:21 a.m. EST) on March 8. But it will take a few months longer for scientists to analyze the data.

“We do whatever we can to make sure the scientists get exactly the kinds of data they need, because only the Voyager spacecraft are still active in this exotic region of space,” said Jefferson Hall, Voyager mission operations manager at JPL. “We were delighted to see Voyager still has the capability to acquire unique science data in an area that won’t likely be traveled by other spacecraft for decades to come.”

As the BBC report adds

“It counts the particles and measures their direction,” explained Suzanne Dodds. “This will give us a much better picture of what’s happening with the solar wind close to the heliopause (the “official” edge of the Solar System). It could be that as we do these measures we see its direction change. All we have out there is models and every time we get data the models don’t quite fit what Voyager sees, and then we have to update the models.”

Voyager’s next destination – interstellar space.

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  • joeCanuck

    !6 hours communication lag. Wow.

  • qwerty12345

    The distance is mindblowing Joe! It takes 16 hours to signal voyager (with the signal moving at the speed of light!) and 16 hours to get a reply!

    Humans are bloody amazing when they arent bollixing everything up.

  • Driftwood


    I’m sure Greenflag would concur..

  • Pete Baker


    And that image was taken in 1990. Just 13 years after the launch, during which time the grand tour past the planets took place.

    Voyager’s been travelling for 20 years further out since then…

  • Driftwood

    I don’t know if you’ve been watching Brian Cox’s terrific ‘Wonders of the Universe’ (Sunday night BBC2 9pm) but the 1st episode refenced that photo. Indeed Professor Cox seems to be following in Dr Sagan’s footsteps.

    I fear NASA’s golden age may be over now though.

  • Pete Baker

    Yeah, I’ve seen the first episode.

    I’m reserving judgement…

  • JAH

    Don’t forget we are talking about a pre computer age bit of kit, with its roots in sliderules and calculators. There are very machines built at the same time still operating and none without a service!

    I wonder ifat some point in our future we’ll pick it up and bring it back to earth, a bit like the SS Great Britian. And it’ll only take a couple of days…

  • joeCanuck

    It’s beyond amazing that we can still communicate over that distance. The signals we send and receive are vanishing small when they reach given the inverse square law.

  • HeinzGuderian

    jah Not unless we can travel faster than the speed of light,and as Einstein demonstrated,that is impossible.

    No,I fear we are restricted to the confines of our own Solar System. Space,after all, is a really,REALLY big place.

  • carl marks

    in front of me is a glass of jamisons i salute the people who dreamed it up the ones who built it and the machine itself. we live on a small island on a small planet in a medicore galaxy but among us are people who dream big wish i was on of them