Category Archives: ESA

Zero-G

zerogesa

ESA, France’s space agency CNES and the German aerospace centre DLR inaugurated the Airbus A310 ZERO-G refitted for altered gravity by running 12 scientific experiments this week.

The French company Novespace has conducted “parabolic flights” for more than 25 years. By flying the parabolic patterns at around 50 degrees up and down a brief period of weightlessness is created at the top of the curve. As the plane comes “over the top” forces on everything in the plane (people included) cancels out and weightlessness is achieved for a brief period.

We’ve all see the videos, what I seldom thought about is what happens at the bottom of the curve. When the plane “bottoms out” and starts climbing the forces on everything in the plane is about 2G.

This particular plane is new being acquired in 2014 replacing an Airbus A300. You won’t find many seats in the passenger area, you will find padded walls so people do not get hurt during the weight/weightless cycles, sick maybe, but not hurt.

Image: ESA

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IXV Readies for Launch

The  Intermediate eXperimental Vehicle, installed on its payload adapter being readied for the 11 February launch. Credit:  ESA–M. Pedoussaut, 2015
The Intermediate eXperimental Vehicle, installed on its payload adapter being readied for the 11 February launch. Credit: ESA–M. Pedoussaut, 2015

February is here and soon ESA’s IXV (Intermediate eXperimental Vehicle) will be put to a big test.

The IXV is about the size of a car and will be lifted by a Vega rocet from Europe’s Spaceport in French Guiana this month if all goes well. The IXV will reach an altitude of about 420 km / 256 miles and then it will reach a speed of 7.5 km/sec or 16,777 mph as it interfaces with the atmosphere at 120 km / 74 miles.

The idea is to simulate any re-entry from low Earth orbit. YES! This is huge! ESA will open up a whole new set of possibilities with the capability of atmospheric return.

The mission should last only about 1 hour and 40 minutes.
About the IXV from ESA

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Comet Dust

Dust particles from Comet 67P/Churyumov-Gerasimenko collected by ESA's Rosetta spacecraft. Copyright ESA/Rosetta/MPS for COSIMA Team MPS/CSNSM/UNIBW/TUORLA/IWF/IAS/ESA/ BUW/MPE/LPC2E/LCM/FMI/UTU/LISA/UOFC/vH&S
Dust particles from Comet 67P/Churyumov-Gerasimenko collected by ESA’s Rosetta spacecraft. Copyright ESA/Rosetta/MPS for COSIMA Team MPS/CSNSM/UNIBW/TUORLA/IWF/IAS/ESA/ BUW/MPE/LPC2E/LCM/FMI/UTU/LISA/UOFC/vH&S

One of the instruments on board ESA’s Rosetta called COSIMA, short for the COmetary Secondary Ion Mass Analyser one of three dust analysis experiments.

Essentially this instrument has a plate for catching dust grains from the comet at fairly low speeds. The dust grains shown above is two of the grains collected and they have yielded some interesting results.

I’ll let ESA explain:

Two examples of dust grains collected by Rosetta’s COmetary Secondary Ion Mass Analyser (COSIMA) instrument in the period 25–31 October 2014. Both grains were collected at a distance of 10–20 km from the comet nucleus. Image (a) shows a dust particle (named by the COSIMA team as Eloi) that crumbled into a rubble pile when collected; (b) shows a dust particle that shattered (named Arvid).

For both grains, the image is shown twice under two different grazing illumination conditions: the top image is illuminated from the right, the bottom image from the left. The brightness is adjusted to emphasise the shadows, in order to determine the height of the dust grain. Eloi therefore reaches about 0.1 mm above the target plate; Arvid about 0.06 mm. The two small grains at the far right of image (b) are not part of the shattered cluster.

The fact that the grains broke apart so easily means their individual parts are not well glued together. If they contained ice they would not shatter; instead, the icy component would evaporate off the grain shortly after touching the collecting plate, leaving voids in what remained. By comparison, if a pure water-ice grain had struck the detector, then only a dark patch would have been seen.

These ‘fluffy’ grains are thought to originate from the dusty layer built up on the comet’s surface since its last close approach to the Sun, and will soon be lost into the coma.

Be sure to check the Rosetta Blog. The have this and results from six other Rosetta’s science instruments since arriving at Comet 67P/Churyumov-Gerasimenko – great stuff!!

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Goodbye Venus Express

Artists concept of Venus Express aerobraking. Credit: ESA
Artists concept of Venus Express aerobraking. Credit: ESA

Word comes from ESA the Venus Express mission has come to an end:

ESA’s Venus Express has ended its eight-year mission after far exceeding its planned life. The spacecraft exhausted its propellant during a series of thruster burns to raise its orbit following the low-altitude aerobraking earlier this year.

Since its arrival at Venus in 2006, Venus Express had been on an elliptical 24‑hour orbit, traveling 66 000 km above the south pole at its furthest point and to within 200 km over the north pole on its closest approach, conducting a detailed study of the planet and its atmosphere.

However, after eight years in orbit and with propellant for its propulsion system running low, Venus Express was tasked in mid-2014 with a daring aerobraking campaign, during which it dipped progressively lower into the atmosphere on its closest approaches to the planet.

Read the rest at ESA.

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Sleep Well Little Philae

Decline in battery power aboard Philae. Credit: ESA via Twitter
Decline in battery power aboard Philae. Credit: ESA via Twitter

The Philae lander is now in an “idle mode” in which most of the systems on board are shut down, including communications.

Before going to sleep, Philae was able to send all of the science data collected so far and completed its main mission in the 57 hours on the comet surface.

Stephan Ulamec, Lander Manager said “This machine performed magnificently under tough conditions, and we can be fully proud of the incredible scientific success Philae has delivered.”

Contact with Philae was lost at 00:36 UT (20:36 EST for the US), according to Rosetta Blog this was about the time of a scheduled loss of signal anyway as Rosetta which was acting as a repeater orbited out of sight of Philae.

Rosetta mission control did try to rotate the lander as was reported and with that effort there was a possibility of communications at 10:00 UTC (05:00 EST) this morning (15 Nov) so Rosetta was listening but no signal came.

As Comet 67P/Churyumov-Gerasimenko gets closer to the Sun there is a possibility enough sunlight will eventually revive the batteries enough to get Philae back on-line. Still I have to wonder if the deep discharge state of the batteries will preclude that given the time and cold environment – time will tell.

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