Parameters of apparent motion of asteroids which collide with the Earth

Details Parameters of apparent motion of asteroids which collide with the Earth Parameters of apparent motion of asteroids which collide with the Earth

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..409r&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

Physics

Minor Planets, Near-Earth Object, Collisions

Scientific paper

This work is dedicated to the observable and dynamic features of Earth-crossing asteroids for the last several weeks before their impact. Orbits, bringing to such collision, were defined on the base of modelling from the position and velocity at a moment of collisions. From the received ensemble of orbits only elliptical orbits with direct motion were considered. Analysis of circumstances of approaching has shown that velocity of visible motion of such asteroids for a week before the collision, does not exceed a value of 15 arcsec per hour, and even is vanishing little for some approach directions. It is two or more times slower than visible velocities of main belt asteroids in opposition. For 300 m asteroid brightness for 2 months before the collision ranges from 13m to 21m, slowly increasing in last days before the impact, where the brightness is increasing very quick. Asteroids on the last revolution before the collision, for a month before the impact, have a horizontal parallax of some dozens of arcseconds. Wide-angle cameras can easy reveal such parallax. Observers who search for Near-Earth asteroids usually devote special attention to "quick asteroids", which leave long traces at the frames. The real "attacking" asteroids at their last 10 days are "slow" objects.

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