1. Finnish Geospatial Research Institute (FGI), Geodeetinrinne 2, FI-02430 Masala, Finland
2. University of Helsinki, Faculty of Science, Gustaf Hällsrömin katu 2, FI-00014 Helsinki, Finland
3. Finnish Fireball Network, Ursa Astronomical Association, Kopernikuksentie 1, FI-00130 Helsinki, Finland
4. Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russia