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

2022-01-27T10:57:08+02:0027/01/2022|

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

2021-12-15T14:46:27+02:0001/07/2021|

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 ...

National Observatory of Athens and the Peloponnese Region signed partnership agreement for the upgrade of the Kryoneri Observatory

2021-11-22T14:53:00+02:0002/03/2021|

The program agreement was signed between the National Observatory of Athens and the Peloponnese Region for the upgrade of the infrastructure of the Kryoneri Observatory with funding from the region of Peloponnesus of 3M euro. The first pillar of the project is the further upgrade of the Kryoneri telescope, thus increasing its observational capabilities. The second pillar focuses on the diffusion of science by creating an exhibition space, where the visitor will be able to take a historical walk in the contribution of this telescope to the science of Astronomy.

CoBiToM project – I. Contact binaries towards merging

2021-12-07T14:32:13+02:0029/01/2021|

Binary and multiple stellar systems are numerous in our solar neighbourhood with 80 per cent of the solar-type stars being members of systems with high order multiplicity. The Contact Binaries Towards Merging (CoBiToM) Project is a programme that focuses on contact binaries and multiple stellar systems, as a key for understanding stellar nature. The goal is to investigate stellar coalescence and merging processes, as the final state of stellar evolution of low-mass contact binary systems. Obtaining observational data of approximately 100 eclipsing binaries and multiple systems and more than 400 archival systems, the programme aspires to give insights for their physical and orbital parameters and their temporal variations, e.g. the orbital period ...

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