Abstract
From preliminary 2010–2011 results of the Cameras for Allsky Meteor Surveillance (CAMS) meteoroid orbit survey, which were combined with published 2007–2009 SonotaCo video meteor network data, 55 new meteor showers (##448–502) were identified and added to the IAU Working List on Meteor Showers in 2012. These showers were identified based on an automated single-linked DSH-criterion analysis of a combined 105,000 orbits with high-threshold (a low DSH<0.05), but low acceptable sample size (⩾6 members). Three more years of CAMS and four more years of SonotaCo observations have now increased the meteoroid orbit database four fold. The earlier detections are verified by searching for number density enhancements in drift-corrected radiant and orbital element maps. Twenty showers are detected in both surveys and are now certain to exist. Median orbital elements are presented. Not detected in this manner were 19% of the fast Vg>40km/s showers, 54% of the Vg=18–40km/s showers, and 90% of the slow Vg<18km/s showers.
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