Panoramic View from Schwarzer Grat

Adelegg, Allgäu, Southern Germany, 1118 m

Date:	08.09.2023	Time:	22:19 - 22:45 UT (CET-1h)
Exposure:	10 x 13 s, 11 x 30 s	Field of view:	360^o x 180^o
Camera:	Lumix S5M2X at ISO 3200	Optics:	18mm, f/2.0 (upwards) and f/2.8 (downwards)
Place:	Schwarzer Grat, Southern Germany	Author:	Till Credner

The brightness in the zenith was down to 21.09 mag per arcsecond² at about 23:20 CET, 08.09.2023. 21.09 mag per arcsecond² is about 2.3 times more bright than the usual clear and moonless sky. This is due to light pollution and the milky way in the zenith at this time. Another natural source of light was airglow during this night, here seen as green diffuse patterns in the sky. A factor of 2.3 means the sky is brightened by 130 %. Measurements were obtained with SQM-LU-DL, serial number 2030. A sport field of Kleinweiler-Hofen was strongly illuminated until 22:30 CET. The extremely bright lights in Maierhöfen lasted all through the night. These poorly shielded lights of a local festival brightened the entire night sky. The second part of the night was dominated by the light of the 30 % waning moon.