Luminous efficiency based on photographic observations of the Lost City fireball and implications for the influx of interplanetary bodies onto Earth.

Details Luminous efficiency based on photographic observations of the Lost City fireball and implications for the influx of interplanetary bodies onto Earth. Luminous efficiency based on photographic observations of the Lost City fireball and implications for the influx of interplanetary bodies onto Earth.

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...311..329c&link_type=abstract

Astronomy and Astrophysics, v.311, p.329-332

Astronomy and Astrophysics

Astrophysics

45

Meteors, Meteoroids

Scientific paper

A new analysis of the atmospheric motion and ablation of the Lost City fireball (with a recovered meteorite fall) has been performed using the original photographic records recently remeasured at the Ondrejov Observatory by Kecl ikov a. Continuous and discrete fragmentation of the body was taken into account using the gross-fragmentation model. From the residuals of this model, the initial rotation of the body was determined by Adolfsson (1995). These procedures explain the atmospheric motion and ablation of the Lost City fireball in a self-consistent way without any discrepancies remaining. The initial dynamic mass m=163+/-5kg and the resulting change of mass with time (rate of ablation) were used for evaluation of the luminous efficiency yielding values of 6.1% at v=13km/s and 1.2% at 4km/s for a temperature of the source 4500K. These values are about 10x larger than the values determined from artificial meteors produced by gram masses fired downward from high-altitude rockets by shaped-charges (Ayers et al., 1970). These new values of luminous efficiencies are assumed to be valid for hundred kilogram masses and are used to recalibrate the plot of influx of interplanetary bodies onto Earth published recently by Ceplecha (1992). Corrections of the influx due to this new calibration are not too large, because of the small values of the population index in these mass ranges. A new plot of cumulative numbers of bodies colliding with the Earth per year and a new plot of incremental mass influx per unit mass interval are given. The total mass influx to the entire Earth's surface is 1.5x10^8^kg per year.

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