C/2017 K2 (PANSTARRS) is a dynamically new hyperbolic comet that has exhibited activity at an extremely large heliocentric distance of 23.75 au. Observations of comet C/2017 K2 were performed at Mayaki observational station of the Astronomical Observatory of Odesa I. I.
The analysis of environmental issues raised by the excessive artificial illumination in the selected areas of the central districts of Kyiv was conducted. The level of light pollution was measured using photometric equipment and compared to the levels of natural illumination. The instrumental measurements were amended with visual observation of sky glow levels and subjective perception of sunset timing. Based on the obtained results the possible health effects for the residents of affected districts were considered.