OBSERVATIONS OF FRAGMENTS OF COMETARY NUCLEI IN THE ATMOSPHERE OVER KIEV

К. И. Чурюмов, А. Ф. Стеклов, А. П. Видьмаченко, Г. Н. Дашкиев

Abstract


As a result of two years of observations the authors identifiedtwilight class of bolides. Unlike the nighttime observations of bright meteor traces that can be seen no more thanten seconds, twilight traces are observed from a few minutes to two hours. The paper considers the synchronousobservation of the evening twilight fireball in the sky over Kiev 25/06/2014 by Dashkiev G.N. and Steklov A.F. Thebasic distance between of photographing points was 8,55 km. On the assumption that the explosions of large meteoroidsin the atmosphere and flash of brightness occurs at the height of their maximum braking in the range significantlyless than the height of the homogeneous atmosphere, it follows that the thermal explosion of the meteoroid took placeat the height substantially more than 15 km. Moreover, flashings and disintegration of perhaps cometary material,began at height more than 25 km. The meteoroid does not flown to the surface of the Earth and disintegrated intofine particles. Preliminary estimate of initial mass of the fragment before the entry into the atmosphere is from 2 to10 tons. On both photos are visible only dispersed trace of cometary nuclei fragments that disintegrated.

Keywords


twilight fireballs; cometary nucleus; meteor traces

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