2 papers
astro-ph.IM2025
Brightness Characteristics of the Qianfan Satellites and Evidence That Some Are Tumbling
Anthony Mallama, Richard E. Cole, Stephan Hellmich +3
The mean apparent magnitude of the Qianfan satellites is 5.76 +/- 0.04, while the mean of magnitudes adjusted to a distance of 1,000 km is 5.24 +/- 0.04, based on 1,161 observation…
astro-ph.EP2024
In-situ observations of resident space objects with the CHEOPS space telescope
Nicolas Billot, Stephan Hellmich, Willy Benz +80
The CHaracterising ExOPlanet Satellite (CHEOPS) is a partnership between the European Space Agency and Switzerland with important contributions by 10 additional ESA member States.…