Fig. 3
From: A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E)
A star chart (left) and a sky image (right) obtained by digital camera with an exposure time of 10 s at 19:51:20 UT on September 28, 2017. The cross on the left chart denotes the position of the local field-aligned position (Azimuth = 187.1° and Elevation = 77.6°). The diameter of the circle on the left is 2 degrees, and the field of view of the star images are about 8° × 6°