European Space Agency Flickr Update

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Shaker test of radiator panel
20-07-2016 05:16 PM CEST

europeanspaceagency posted a photo:

Shaker test of radiator panel

A radiator panel designed to ensure telecommunication satellites keep their cool in space seen during testing on the most powerful electrodynamic shaker of ESA’s ESTEC Test Centre.

As the capabilities of telecom satellites go on increasing, so does the quantity of waste heat they generate. This Deployable Panel Radiator has been designed by Airbus Defence & Space to supplement the traditional fixed passive radiators employed for telecom satellite thermal control.

Video highlights of the shaker testing in early July .

The radiator is threaded through with heat pipes containing ammonia. In gaseous form, the ammonia travels along the panel, condensing into liquid to dump waste heat out into space. Then in liquid form it returns back again, along a specially designed capillary mesh, so the cycle can continue.

Once qualified, the Deployable Panel Radiator will be added to the company’s upcoming Eurostar Neo satellite platform, in development as part of ESA’s Advanced Research in Telecommunications Systems Next Generation Platform programme.

Testing was carried out on ESA’s Quad shaker, with a moveable platform attached to a quartet of 160 kN electromagnetic shakers. Follow-up testing is scheduled with the Test Centre’s Large European Acoustic Facility.

“From a testing point of view the DPR confirms a trend that spacecraft components are growing both larger and lighter,” comments Alexander Kuebler of ETS, the company that operates the Test Centre for ESA.

“Thanks to ESA’s Quad shaker we are able to offer a vibration platform that is capable of accommodating such large test articles and shake them beyond an acceleration of 18g.”

Designed for full-scale satellite testing, the ESTEC Test Centre is a collection of facilities to simulate every aspect of the space environment.

Everything is located under a single roof, within a controlled cleanroom environment tailored for delicate flight hardware. Based in a dedicated building in ESTEC, it is the largest centre of its kind in Europe, and one of the largest in the world.

Credit: ESA–G. Porter

SpaceX Dragon CRS-9 chasing the ISS
20-07-2016 12:04 PM CEST

europeanspaceagency posted a photo:

SpaceX Dragon CRS-9 chasing the ISS

An excellent early morning twilight image showing the International Space Station (thick streak) with the SpaceX Dragon CRS-9 cargo vessel (thin streak) seen chasing it approximately 25 seconds later.

It was acquired on 20 July 2016 at 01:41 GMT (03:41 CEST), just a few hours before the planned berthing at 10:00 GMT (12:00 CEST).

The image was taken by Marco Langbroek from his home in Leiden, the Netherlands. It is a five-second exposure using a Canon EOS 60D + EF 2.0/35 mm lens, 800 ISO.

More details on Dragon berthing and live coverage on 20 July via: NASA.

Credit: M. Langbroek

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