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Title:		The Tunguska object - A fragment of Comet Encke
Authors:		Kresak, L'.
Affiliation:		AA(Slovenska Akademia Vied, Astronomicky Ustav, Bratislava, Czechoslovakia)
Publication:		Astronomical Institutes of Czechoslovakia, Bulletin, vol. 29, no. 3, 1978, p. 129-134.
Publication Date:		00/1978
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		Comets, Meteoroid Showers, Tungusk Meteorite, Chondrites, Earth Orbits, Meteorite Craters, Orbital Elements, Shock Waves, Taurid Meteoroids
Bibliographic Code:		1978BAICz..29..129K

Abstract

It is pointed out that the solar longitude and equatorial coordinates of
the apparent radiant of the Tunguska object (1908), as given by Zotkin
(1966), are in good agreement with those of Comet Encke and the Beta
Taurid shower, which is one of the two annual appearances of the broad
meteor stream associated with Comet Encke. This suggests that the
Tunguska object may have been a fragment of Comet Encke, and a
trajectory prior to impact is reconstructed, and the encounter velocity
is estimated at 31 plus or minus 2 km/sec. The tremendous explosion,
shock wave, and forest fire without appreciable cratering also provide
support of the cometary nature of the object. The Whipple (1968)
conjecture that the body was an asteroidal pre-type I carbonaceous
chondrite is equally in accord with encounter geometry and nature of
damage, but recent data classify all but one of the Apollo asteroids as
silicaceous or ordinary chondritic objects.

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