Final curtain for Europe's deep-space telescope

Jun 17, 2013
Herschel in space, close up on its mirror. Credits: ESA (Image by AOES Medialab)

The deep-space telescope Herschel took its final bow on Monday, climaxing a successful four-year mission to observe the birth of stars and galaxies, the European Space Agency (ESA) said.

The largest and most powerful in space, Herschel made over 35,000 scientific observations and amassed more than 25,000 hours of science data, it said.

"Herschel has been turned off," ESA director general Jean-Jacques Dordain told journalists at the Paris Air Show.

"It is not a surprise, it was expected, it was scheduled," he added.

Herschel has run out of a supply of required to cool its instruments to near absolute zero (minus 273.15 degrees Celsius or minus 459.67 degrees Fahrenheit) in order to make its observations.

"As it heats up it becomes unusable," said Dordain, explaining why the data link with Herschel was shut down at 1225 GMT Monday.

Its mission officially ended on April 29, but the satellite was used in its dying weeks as an "orbiting testbed", said an ESA statement.

"We had a sophisticated spacecraft at our disposal on which we could conduct technical testing and validate techniques, software and the functionality of systems that are going to be reused on ," said Herschel's manager, Micha Schmidt.

"This was a major bonus for us."

The satellite has now been placed in a safe, "disposal" orbit around the Sun.

"The last thruster burn came today, ensuring that all fuel is depleted," said the ESA statement.

Launched in May 2009, Herschel carried 2,300 litres of liquid helium coolant, which evaporated over time. Its expected lifetime had been 3.5 years.

At 7.5 metres (24.3 feet) high and four metres wide, Herschel had a launch mass of 3.4 tonnes.

It cost 1.1 billion euros ($1.4 billion), and was named after Sir William Herschel, the German-born British astronomer who discovered Uranus in 1781 and in 1800.

It carried three cameras and spectrometers and a primary mirror 3.5 metres (11.37 feet) across—able to collect almost 20 times more light than any previous infrared space telescope.

Its infrared technology allowed Herschel to see galaxies that were previously hidden from scientists' view by cosmic dust clouds.

In 2011, it was reported that Herschel found the first confirmed evidence of oxygen molecules in space.

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User comments : 2

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Humpty
2 / 5 (4) Jun 18, 2013
Bit of a piss off, really.

The drama of the brilliant high tech going off line forever.. is a bit of a disappointment.

But I dunno - there is so much, or staggering amounts of research and everything happening..

I guess it's get yourself a pet project and run with it and then get another one.

Like the Hubble Telescope - sure it was never meant to run forever (50 years plus), but it's discoveries, made just cosmic history and forever shaped the lives of humanity with it's staggeringly amazingly amazing images....

The Whores Head Nebula, and how big it was, and all in incredible colours.....
antialias_physorg
4.2 / 5 (5) Jun 18, 2013
The Whores Head Nebula

I'm not sure the IAU would approve such a name.

The drama of the brilliant high tech going off line forever.. is a bit of a disappointment.

It's not like this was unexpected. The supply and rate of helium usage was known. Herschel accomplished its mission (and then some). Can't ask for more.

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