WGN, the Journal of the IMO 42:1 (2014) 7 Meteor science Some interesting meteor showers in EDMOND database Jakub Koukal, 1 Juraj Tóth, 2,3 Roman Piffl, 1 and Leonard Kornoš 2 This paper demonstrates the growing potential of EDMOND, a database of meteor orbital data, by presenting a summary analysis of eight meteor showers based on data collected over the period 2009 to 2012. The amount of input data (EDMOND 2.0 adds 79 402 new orbits) allows for improvement of mean orbits of Ursids, Andromedids, alpha Capriconids, Leonis Minorids, December Monocerotids, sigma Leonids, October Ursae Majorids and October Camelopardalids. Received 2013 May 21 1 Introduction EDMOND (European viDeo MeteOr Network Data- base) is a database of meteor orbital data computed from meteors captured using video observation. It is the result of a broad international cooperation and shar- ing of data between EDMONd (European viDeo Me- teor Observation Network) and the IMO VMN (Inter- national Meteor Organization Video Meteor Network). Contributors to EDMOND can be found in (Kornoš et al., 2014). The EDMOND version 2.0 database (see web page http://www.daa.fmph.uniba.sk/edmond) consisted of 79 402 orbits in the period of 2009–2012 meeting spe- cific minimum quality criteria. More details can be found in (Kornoš et al., 2013). With a substantial num- ber of orbits based on relatively high quality meteor observations, detailed analysis of weak meteor streams and more precise characterization of well-known meteor showers is possible. This paper presents the analysis of eight meteor showers using data from the EDMOND 2.0 database as follows: • Ursids and Andromedids (Irregular showers) • α Capriconids (A regular shower which exhibits a higher population of bright meteors) • Leonis Minorids and December Monocerotids (Regular showers with lower average brightness meteors) • σ Leonids, October Ursae Majorids, and October Camelopardalids (Showers with lacking sufficient orbits in current database) The calculated orbits for these showers are com- pared with mean orbits from the IAU MDC (IAU MDC, 2013). The mean shower orbits from the IAU MDC are listed in the Table 1. For completeness, possible parent bodies for these showers are listed in Table 2. 1 CEMeNt - Central European Meteor Network 2 Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina, 842 48 Bratislava, Slovakia 3 Email: toth@fmph.uniba.sk IMO bibcode WGN-421-koukal-edmond NASA-ADS bibcode 2014JIMO...42....7K 2 Ursids (IAU 0015 URS) The Ursid meteor shower is active between December 17 and December 25 with the maximum activity occur- ring around December 22 and ZHR ∼ 10. Returns of its parent body, comet 8P/Tuttle, are correlated to ir- regular shower maxima with ZHR ∼ 100 several years after the comet’s perihelion passage. The EDMOND database 2.0 contains 113 orbits of Ursids found by the radiant–V g method used in UFO- Orbit software (SonotaCo, 2009). A subset of 86 orbits was selected using the iterative method (Porubčan & Gavajdová, 1994; Arter & Williams, 1997) with D SH < 0.15 (Southworth & Hawkins, 1963) for mean stream orbit characterization (Table 3, Figure 1). The average D SH computed was D SH =0.067 ± 0.037. The dataset contains only three hyperbolic orbits. The mean orbit from the EDMOND data is consistent within the stan- dard deviation with the previously published orbit by (Jenniskens, 2006) obtained from a similar number of meteors. Figure 1 – Orbits of Ursids from the EDMOND 2.0 database with DSH < 0.15. 3 Andromedids (IAU 0018 AND) The Andromedids meteor shower is well known as a very active shower from the second half of the 19th century, when meteor storm displays produced ZHRs of 7000 in 1872 November 27 and 1885 November 27 (Jenniskens & Vaubaillon, 2007). A smaller meteor outburst with a ZHR ∼ 1000 was observed on 1892 November 24.