Bulletin 12 of the International Leonid Watch: Final Results of the 1997 Leonids and Prospects for 1998

Details Bulletin 12 of the International Leonid Watch: Final Results of the 1997 Leonids and Prospects for 1998 Bulletin 12 of the International Leonid Watch: Final Results of the 1997 Leonids and Prospects for 1998

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jimo...26..161a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 26, no. 4, p. 161-165

Physics

6

Scientific paper

Visual reports of the 1997 Leonid shower are used to calculate an activity profile for the Leonid stream's 1997 return. Despite th Full-Moon conditions, is was possible to derive a fairly consistent ZHR profile; the flux profile is much more noisy, as it strongly depends on the population index profile which is less reliable due to the limited number of meteor magnitude estimates available. Increased activity began near lambda=235.0 degrees (all solar longitudes refer to equinox 2000.0) and persisted until at least lambda=236.0 degrees. The peak ZHR value is near 100+-15 at circa lambda=235.22+-0.04 degrees, corresponding to November 17, 1997, 12h 15m UT. High activity of ZHR>80 persisted until lambda=235.5 degrees, but it is argued that this continued activity is an artifact due to underestimated limiting magnitudes as judged from sporadic rates. The population index shows an increase from 2.0 to 2.5 at lambda=235.15+-0.02 degrees (November 17, 10h 30m UT), as occurred in 1996, but the statistical significance of the increase is marginal in 1997. Strong lunar interference precludes any definitive statement concerning the visual activity of the shower in 1997. The outlook for the 1998 return based on available information is summarized.

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