Orbital parameters and chemical nature of omicron cygnids meteoroids

Abstract

The first observations of meteor activity in July from a radiant in the vicinity of Deneb were performed by Denning between 1885 and 1918 [1]. This minor shower, that was called the omicron- Cygnids, was described in detail by Jenniskens [2], who determined an entry velocity for meteoroids of about 37 km/s and a radiant located at α=305º, δ=47º. In a latter paper by Olech et al [3], the activity period of the omicron-Cygnids was determined to extend from around June 30 to July 31, with a clear maximum near July 18 and an entry velocity of meteoroids of about 41 km/s. In any event, our knowledge about the omicron-Cygnids is poor. Thus, observations during the activity period of this shower are desirable in order to obtain precise orbital information, but also to determine different physico-chemical properties of meteoroids in this stream. In particular, meteor spectroscopy can be very useful to obtain information about the chemical nature of these particles. In this context, we present here the analysis of an omicron Cygnid fireball recorded in the framework of the SPanish Meteor Network (SPMN) in 2012