Publications de Stephan Hellmich

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We performed a unique Venus observation campaign to measure the disk brightness of Venus over a broad range of wavelengths in 2020 August and September. The primary goal of the campaign was to investigate the absorption properties of the unknown absorber i ...

The CHaracterising ExOPlanet Satellite (CHEOPS) is a partnership between the European Space Agency and Switzerland with important contributions by 10 additional ESA member States. It is the first S-class mission in the ESA Science Programme. CHEOPS has bee ...

In essence, the problem of orbital pollution is a tragedy of commons. Space does not belong to anyone, thus, there is a tendency to exploit it excessively without accountability for mitigating the resulting consequences. While sustainable space solutions h ...

Context. The study of asteroids, particularly near-Earth asteroids, is key to gaining insights into our Solar System and can help prevent dangerous collisions. Beyond finding new objects, additional observations of known asteroids will improve our knowledg ...

We use our new light curves, along with historical data, to determine the rotation state, photometric properties, and convex shape models of the targets of the Lucy mission (3548) Eurybates and (21900) Orus. We determine a retrograde spin for both targets, ...

The first Swiss Space Sustainability Research Days, held from January 6–8, 2025, in Les Diablerets, brought together over 50 experts from Swiss research institutions and industry. Participants explored key topics including the environmental impact of space ...

Stephan Hellmich

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Reflectivity of Venus's Dayside Disk During the 2020 Observation Campaign: Outcomes and Future Perspectives

In-situ observations of resident space objects with the CHEOPS space telescope

Sustainable Solutions in the Space Sector: Factors Determining the Perception of the Opportunity Landscape by Key Players in the Space Industry

A method for asteroid detection using convolutional neural networks on VST images

Shape Models of Lucy Targets (3548) Eurybates and (21900) Orus from Disk-integrated Photometry

Swiss Space Sustainability Research Days 2025 - Book of Abstracts