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Ursa Astronomical Association

Rocket-related clouds - 29.3.2023 at 23.05 - 29.3.2023 at 23.06 Kiiminki Observation number 113887

Visibility V / V

Arto Murtovaara, Oulun Arktos

A comet-like object, it looked like it had two tails like a comet. Two swans moved for about a minute from the direction of the constellation Lyra, where it changed its shape to look like a lifting pressure fog and expanded considerably, maybe about 1-2 degrees wide and disappeared behind the trees and at the same time also went behind the cloud. The brightness of the core corresponded to about the brightness of Venus. Seen through a thin cloud. The height of the object was maybe about 30 degrees and it descended to about 20 degrees before disappearing, the length of the tail was about 10 degrees. The height and brightness values are drawn from a hat with a mutu feeling, so they may have a throw to the real values.


#raketti: Soyuz 2.1y
#satelliitti: Kosmos 2568



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Additional information
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      The rocket contrails are colorful clouds that appear when the sun is below the horizon. The contrails can float so high in the atmosphere that the sun shines on them even if it is already completely dark on the ground. They stay visible noticeable quite long after the launch.

      The colors are created by the scattering of sunlight in the small ice crystals. In Finland, rocket phenomena from two different locations have mainly been observed. One of them is the missile launches from the submarines from the White Sea and the Arctic Ocean. They use solid fuel that creates colorful clouds.

      Another source of rocket phenomena is the Plesetsk Cosmodrome Area in Russia. There are a few launches from there every year. These fires usually use liquid fuels, making the clouds less spectacular.

      The visibility of the rocket launch is affected by the time at which the launch is made and where the winds blow. The best of all is around 3-5 o'clock Finnish time, when the cloud has time to spread out a bit and shine in the morning sun coming from the east when it is still dark or dark in Finland.

      During the first decade of the 2000s, rocket phenomena have been observed about twice per year in Finland. Since then, however, it has been quieter.

      Rocket contrails from Oulunsalo, Photo by Jarmo Moilanen.

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