Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acasn..42..390z&link_type=abstract
Acta Astronomica Sinica, vol.42, no.4, p. 390-396
Other
3
Leonid, Meteor Shower, Photographic Observations, Magnitude, Leonid, Meteor Shower, Photographic Observations, Magnitude
Scientific paper
Two photographs about Leonid meteor shower taken on 19 November 1999 have been analyzed in this paper. Photographic observations can record more quantitative information than visual observations. In this paper, a moving angle-velocity of a meteoroid, which appears on the film, is calculated. The beginning elevations of meteors, the angle-distance between the ending point of a meteor and the radian, the moving angle-velocities of meteors, and the arc-distances of meteor's paths are also reckoned. In addition, a time gap of about 0.65 second for ablation of Leonid meteoroids in atmosphere is obtained. It means that the distance for ablation is about 40 to 50 kilometers. Through digitized procession of the photographs, photographic magnitudes of -10.3+/-0.2 and -4.8+/-0.2 have been measured for the two Leonid meteors, respectively. Their masses and electric line densities could be deduced. The procedure in this paper could be used in other meteor showers for photographic observations. Besides, how to select a camera lens for meteor observations is also discussed.
Wu Jian-Guo
Zhang Zhou-Sheng
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