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TRISAT-R CubeSat: A Glimpse of Earth through the Eye of a Coin-Sized Camera
This unusual image was acquired using an extremely miniaturised camera about the size of the edge of a 20 cent coin - a miniscule technology experiment aboard ESA's shoebox-sized TRISAT-R CubeSat.
TRISAT-R CubeSat: A Glimpse of Earth through the Eye of a Coin-Sized Camera
by Staff Writers
Maribor, Slovenia (SPX) Nov 10, 2023

In a striking display of miniaturized innovation, the European Space Agency's TRISAT-R CubeSat has provided a unique perspective of our planet Earth from an altitude of 6,000 kilometers, captured through a camera no larger than the edge of a 20-cent coin. This technological feat, demonstrating the prowess of highly compact space technology, has been a part of Slovenia's second space mission, signifying a leap in nanosatellite capabilities.

The camera, described by TRISAT-R project manager Iztok Kramberger from the University of Maribor as "measuring less than two cubic millimeters," achieved the remarkable task of photographing Earth - an object of roughly one trillion cubic kilometers. The stark contrast in scale between the camera and its subject underscores the vast potential of miniaturized space technology.

Launched aboard the inaugural Vega-C mission, TRISAT-R inhabits the medium-Earth orbit, a region fraught with challenges including the ionosphere's electrical activity and the inner Van Allen radiation belt. The CubeSat's journey through these areas is not merely to orbit Earth; it serves a critical role in testing radiation-detection payloads. This mission detail is pivotal, as it provides insights into the behavior of electronic components in space, which is essential for the design of future spacecraft.

The TRISAT-R team's innovation extends to the integration of a pair of minuscule cameras into the satellite, complete with lenses crafted from clear borosilicate glass to provide a measure of radiation resistance. These cameras are directly mounted onto 320x320 pixel image sensors, a design choice that while limiting in resolution, fulfills the mission's primary scientific objectives.

According to Dr. Kramberger, the cameras were not intended for detailed Earth imaging. The CubeSat relies on magnetorquers for attitude control, which presents challenges for precision pointing. Nevertheless, the mission has yielded unexpected visual dividends. "Our main interest has been in capturing examples of the 'Black Sun effect,'" Dr. Kramberger notes, a phenomenon well-documented in digital imaging. The team's success in this endeavor has been complemented by serendipitous captures of Earth, such as the image released.

ESA's support in manufacturing, assembly, and testing of TRISAT-R through its General Support Technology Programme has been crucial, facilitating the 'Fly' element that offers in-orbit demonstration opportunities for European companies.

As TRISAT-R approaches the conclusion of its commissioning phase later this month, after 16 months of operations, the project stands as a testament to the evolving landscape of space technology, where small-scale satellites undertake missions once reserved for their larger counterparts.

The implications of such missions are widespread, influencing not only the future of satellite design but also the economics of space exploration. As CubeSats like TRISAT-R continue to perform beyond expectations, the space sector is primed for a transformation, leveraging the agility and potential of nanosatellite technology.

For industry professionals and enthusiasts alike, the upcoming 4S Small Satellites Systems and Services Symposium, co-organized by ESA and the French space agency CNES, promises to be a hub of knowledge sharing and discussion. Scheduled for May 26-31, 2024, in Palma de Mallorca, the symposium will delve into the expanding role of small satellites in modern space endeavors.

The image of Earth, as seen through the diminutive yet capable lens of TRISAT-R, not only captures the beauty of our planet but also symbolizes the boundless opportunities that lie within a small package. It's a reminder that in the cosmos, as in technology, size is not an indicator of potential.

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University of Maribor
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