New comet models thanks to "Chury" data

The Rosetta spacecraft has already made history: Rosetta’s mission took twelve years including notable firsts like the first orbit of a comet (and for 2 years no less) and, for the first time placing a lander on a comet surface. After its last signal on September 30, 2018 at 1:30 p.m. the spectacular mission had come to an end, with Rosetta undergoing a controlled crash on "its" comet Churyumov-Gerasimenko. The ROSINA instrument from Bern had been taking measurements right until the very end.

The controlled crash was far from the end of the work for the scientists involved. The international research project MiARD under the direction of Nicolas Thomas, Professor at the Physics Institute of the University of Bern and member of the Center for Space and Habitability CSH sought, between March 2016 and August 2018, to make the best use of the Rosetta data by combining complementary datasets from different instruments, using a holistic approach to develop and test numerical models. Nicolas Thomas says: "Our research should help explain the behaviour of the comet and help to understand its history." The ultimate aim of such cometary research is to better understand the origins of our solar system, and planetary systems in general.

The new insights into comets and the origin of the solar system obtained from the Rosetta mission through the work of the MiARD project have now been presented on the occasion of a special event.  The Swiss photographic artist Bernd Nicolaisen introduced his image series 'Head of 67P – ESA/ROSETTA mission' and 'Chury out of Horizon' which were inspired from the images taken by the Rosetta mission.

Fundamental research results used worldwide

Outcomes of the MiARD project include a high resolution (metre-scale) digital shape model of the comet Churyumov-Gerasimenko that has been used to support further studies by scientists worldwide. "What is more, the project team has produced an improved map of the comet, identifying many new terrains", explains Nicolas Thomas, "and we have provides estimates for the strength of the comet." Such results are important if humanity is to ever attempt to utilize comets or needs to divert one away from a collision course with Earth, explains Thomas further.

A numerical model explaining how the comet loses mass under the influence of the Sun has been created and successfully tested, and also used to make improved predictions of the orbits of cometary dust – a main source of meteor storms and a possible hazard to satellites and spacecraft.

Over a dozen peer-reviewed publications have been published or submitted for publication by the project, with several more in preparation. The work of the project team will also be used to support proposals for follow-up missions.