  Mini-EUSO will observe the Earth in the UV range (300 - 400 nm) offering the
opportunity to study a variety of atmospheric events such as Transient Luminous
Events (TLEs), meteors and marine bioluminescence. Furthermore it aims to
search for Ultra High Energy Cosmic Rays (UHECR) above $10^{21}$ eV and Strange
Quark Matter (SQM). The detector is expected to be launched to the
International Space Station in August 2019 and look at the Earth in nadir mode
from the UV-transparent window of the Zvezda module of the International Space
Station.
  The instrument comprises a compact telescope with a large field of view
($44^{\circ}$), based on an optical system employing two Fresnel lenses for
light collection. The light is focused onto an array of 36 multi-anode
photomultiplier tubes (MAPMT), for a total of 2304 pixels and the resulting
signal is converted into digital, processed and stored via the electronics
subsystems on-board. In addition to the main detector, Mini-EUSO contains two
ancillary cameras for complementary measurements in the near infrared (1500 -
1600 nm) and visible (400 - 780 nm) range and also a 8x8 SiPM imaging array.
