Meteoroid streams identification amongst 231 Southern hemisphere video meteors

Abstract

video meteoroid orbits observed at the Southern Hemisphere were searched for streams. Several searches has been made by three D-criteria: DSH by (5), DN by (6) and DV proposed lastly by (7) The mutual D- distances we processed with a cluster analysis com- puter program implementing an algorithm based on the single neighbor linking technique. The values of the meteor association thresholds for groups of 2, 3, 4, ... members were estimated by the statistical approach. In all basic searches about 29-33% of the meteoroid's sample turned out to belongs to the stream compo- nent. Following streams have been detected: Piscis Austrinids, Piscids, Librids, Ophiuchids, Capri- cornids and Microscopids. The Piscis Austrinids consists of two exactly the same orbits. In this case we do not claim about a real stream, and we do not discuss this result. Twelve members of Piscids were detected using all three D-functions, and we didn't find this stream among the members of the working list of the IAU MDC. Therefore we have some basis to claim that our Piscids are a new mete- oroid stream. In our search, already known Librids and Ophiuchids formed two separate groups. They were identified in the basic search using DSH function with 36 and 25 members respectively. UsingDV andDN both streams were detected as a single very complex structure. Ten members ofchi Capricornids and six members of Microscopids were found using theDN function only. Also for those streams we did not find any counterparts among the stream given on the working list of the IAU MDC.