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The Institute of Astronomy Astrophysics Space Applications & Remote Sensing of the National Observatory of Athens operates Helmos observatory, which was selected as the first Optical Ground Station under the ScyLight framework. Project HOTSPOT (https://artes.esa.int/projects/hotspot) aims to identify all possible activities that can be carried out at Helmos observatory in Greece concerning optical, quantum, and deep space communications.

Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations


A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection. We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric pressure since the Voyager 2 epoch (1989). We also derived the shape of the lower atmosphere from central flash analysis.

Optical observations of the BepiColombo spacecraft as a proxy for a potential threatening asteroid


We present the results of our ground-based astrometric observation campaign of BepiColombo during its Earth fly-by on 2020 April 10. The observational circumstances induced by the fly-by geometry made this event an excellent proxy for a close fly-by or an imminent impact of a natural body with a diameter of a few meters, with the added benefit of having a ground-truth orbit (from radio tracking) to compare with our purely ...

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