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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Negative observation of missing night shining clouds - 23.5.2023 at 23.49 - 24.5.2023 at 00.21 Helsinki Observation number 116278

Visibility Unclassified

I started observing before midnight. The air was otherwise clear, but a cloudy gray zone extended to a height of 10 degrees, where the very weak night clouds might not stand out. However, the horizon cleared somewhat after midnight. The first observation period ended at 0:21. I did another check between 1:35 northwest and northeast. All the images in the report are severely blown ->below 10 degrees there is streakiness, which cannot really be interpreted as night clouds and is more naturally explained by distant dust cloud and cloud layers. Above the streak area, a whitish strip a few degrees wide could be seen by the eyes and in the images, but it did not have any structure. In one picture, however, a possible twinkling of a satellite appeared.

Additional information
  • Havainto
    • Negative observation of missing night shining clouds
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