Copernical Team
Paper explores ideal orbits for space-based interferometers
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Ever since the telescope was invented in 1608, astronomers have striven for bigger and better telescopes. When it comes to instruments to observe the sky, bigger really is better whether you are observing faint galaxies or planets a larger collector gives higher resolution and brighter images. A paper by Takahiro Ito from the Institute of Space and Astronautical Science in Japan recently posted to the arXiv preprint server looks into different kinds of orbits around Earth which support multiple telescope systems known as interferometers at different orbits.
There is a limit to the size of telescopes based on Earth, they can become so large that they warp under their own weight so it is a constant battle to keep images sharp. An alternative solution is to hook up multiple telescopes so they work together. These interferometers work well on Earth but space-based instruments offer further challenges. In Ito's study, which looks into different types of orbits, it seems there is one orbit in particular that favor the space-based interferometer.
Understanding a satellite's death spiral
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Down on the ground, death equals stillness—but not in space. Abandoned satellites are prone to tumble in unpredictable ways, and an ESA project with the Astronomical Institute of the University of Bern sought to better understand this behavior.
ESA's Clean Space initiative has plans to remove dead satellites from highly trafficked orbits. The preferred method of "Active Debris Removal" involves grabbing the target object, in which case knowledge of its precise orientation and motion will be vital. So the need to understand the tumbling that almost all satellites and rocket bodies undergo after their mission end-of-life is clear.
The project combined optical, laser ranging and radar observations to refine an existing "In-Orbit Tumbling Analysis" computer model, aiming to identify, understand and predict the attitude motion of a fully defunct satellite within a few passes. More than 20 objects were observed during a two-year campaign.
The long list of perturbation triggers includes "eddy currents" as internal magnetic fields interact with Earth's magnetosphere, drag from the vestigial atmosphere, gravity gradients between the top of an object and its bottom, outgassing and fuel leaks, the faint but steady push of sunlight—known as "solar radiation pressure"—micrometeoroid and debris impacts, even the sloshing of leftover fuel.
How NASA keeps Ingenuity going after more than 50 flights
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More information is always better when it comes to publicly funded space exploration projects. So it's welcome when a NASA engineer takes time out of the assuredly busy work lives to provide an update on everyone's favorite helicopter on Mars. Ingenuity has been having a rough few months, and a new article entitled "The Long Wait," posted by Travis Brown, Chief Engineer on the Ingenuity project, on NASA's website, provides a good amount of detail as to why.
The problems started when Ingenuity took off for flight #52 on April 26th. When the helicopter landed, it was out of range Perseverance, its rover companion, and the helicopter's radio link back to its controllers on Earth. This was intentional, but it meant that Ingenuity's minders didn't know whether the flight had been completed successfully.
Dr. Brown explains why the team would intentionally choose to land the helicopter out of range of Perseverance and details the four main mission priorities for the helicopter's secondary mission.
Collaboration is key to providing security during crises
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Representatives of the space industry came together with individuals from ESA member states, user communities and academia on 22-23 November to discuss how space data are being made more secure and accessible in response to an increasing number of crisis situations, such as climate-change related natural disasters.
Watch live: Launch of EIRSAT-1
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Watch the live launch broadcast of Ireland’s first satellite EIRSAT-1 on ESA Web TV Channel 2 and ESA YouTube, currently scheduled for 29 November. Coverage of this historic moment is set to begin shortly before 18:00 UTC (19:00 CET) (times to be confirmed).
Ariane 6 hot-fires: the highlights
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Video:
00:01:25
Cinq, quatre, trois, deux, un. Allumage Vulcain! This is the moment Ariane 6’s main engine was sparked into life, and the entire main stage of the new rocket and the many parts of the launch pad in Kourou, French Guiana, practised for the full duration of a launch. Of course, as planned, the test model did not leave the ground.
Without its boosters, instead of piercing the clouds Ariane 6’ created its own on Earth: a clean byproduct of the Vulcain 2.1 engine’s oxygen and hydrogen propellants, which came together to send out impressive swirls of H2O.
After the
Week in images: 20-24 November 2023
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Week in images: 20-24 November 2023
Discover our week through the lens
‘The making of Juice’: the story behind the film
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One giant planet. Three icy moons. An eight-year journey. One special spacecraft.
Building a mission to Jupiter took years of planning and thousands of people. Now that Juice is finally en route to its destination, our documentary ‘The making of Juice’ takes a look behind the scenes at the development and testing of the spacecraft in the three years leading up to launch. We hear from Juice Project Manager, Giuseppe Sarri, about how and why the film was made.
HummingSat: a new chapter in space innovation unveiled
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ESA and SWISSto12, a leading manufacturer of advanced satellite payloads and systems, have signed a contract for the full development of a new product line of satellites called HummingSat.
Earth from Space: Salty lakes
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Image:
The Copernicus Sentinel-2 mission captures the colourful waters of two salty lakes in East Africa: Lake Natron in northern Tanzania and Lake Magadi in southern Kenya. 
