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2021 – 4 eMeteorNews Contents Identification of new meteor showers SCP (#1042) and OSG (#1043) and their associations with the asteroids 2019 OK and 2017 NT5 L. de Sousa Trindade, A. Dal’Ava Jr., C. Jacques Faria, M. Zurita and G. Gonçalves Silva................. 297 Bright fireballs recorded along February 2021 in the framework of the Southwestern Europe Meteor Network J.M. Madiedo, J.L. Ortiz, J. Izquierdo, P. Santos-Sanz, J. Aceituno, E. de Guindos, P. Yanguas and J. Palacián .................................................................................................................................................. 311 Bright fireballs recorded along March 2021 in the framework of the Southwestern Europe Meteor Network J. M. Madiedo, J. L. Ortiz, J. Izquierdo, P. Santos-Sanz, J. Aceituno, E. de Guindos, P. Yanguas and J. Palacián .................................................................................................................................................. 320 Beta Tucanids (BTU #108) meteor outburst in 2021 P. Jenniskens ........................................................................................................................................... 330 Narrow shower of zeta Pavonids (ZPA, #853) P. Jenniskens ........................................................................................................................................... 332 A note on the likely non-reality of the September pi Orionids (POR,#430) J. Greaves ................................................................................................................................................ 334 February alpha Corvid (FAC#1101) meteors P. Jenniskens ........................................................................................................................................... 335 Gamma Draconid (GAD#1106) meteor shower D. Vida and D. Šegon .............................................................................................................................. 337 Is DLM (#0032) a mystical meteor shower? I. Sergei ................................................................................................................................................... 340 December 2020 report CAMS BeNeLux P. Roggemans .......................................................................................................................................... 345 Annual report 2020 CAMS BeNeLux P. Roggemans .......................................................................................................................................... 347 January 2021 report CAMS BeNeLux P. Roggemans .......................................................................................................................................... 354 Automated feature extraction from Radio Meteor Spectrograms P. Mohan ................................................................................................................................................. 356 Radio meteors February 2021 F. Verbelen .............................................................................................................................................. 361 Radio meteors March 2021 F. Verbelen .............................................................................................................................................. 367 Radio observations in February 2021 I. Sergei ................................................................................................................................................... 373 Radio observations in March 2021 I. Sergei ................................................................................................................................................... 376 Grazing meteor over Belarus I. Baluyk, S. Dubrovski, Y. Goryachko, K. Morozov and I. Sergei .......................................................... 379 © eMeteorNews eMeteorNews 2021 – 4 Identification of new meteor showers SCP (#1042) and OSG (#1043) and their associations with the asteroids 2019 OK and 2017 NT5 Lauriston de Sousa Trindade1, Alfredo Dal’Ava Jr1, Cristovão Jacques Faria1,2, Marcelo Zurita1,3, Gabriel Gonçalves Silva1,4 1 Brazilian Meteor Observation Network, Nhandeara, Brazil [email protected] 2 SONEAR - Southern Observatory for Near Earth Asteroids Research, Oliveira, Brazil [email protected] 3 Associação Paraibana de Astronomia, João Pessoa, Brazil [email protected] 4 Instituto de Química, Universidade de São Paulo, São Paulo, Brazil [email protected] The Brazilian Meteor Observation Network, BRAMON, reports the discovery of two meteor showers, observed after a search in its own database. For the meteor shower #1042 SCP, one meteor was found in 2015, six meteors in 2016, four meteors in 2017, one meteor in 2018, one meteor in 2019 and three meteors in 2020, occurring between solar longitudes of 103° and 138°. The mean radiant position is at right ascension of 312.2° and declination of –20.8°. For the meteor shower #1043 OGS, the evidence is based on one meteor in 2014, one meteor in 2015, three meteors in 2016, eight meteors in 2017, two meteors in 2018 and five meteors in 2020, occurring between solar longitudes of 100° and 126°. The mean radiant position is at right ascension of 297.3° and declination of –26.7°. The asteroids 2019 OK and 2017 NT5 were identified as the most probable parent bodies of the particles responsible for the meteor showers. 1 Introduction concluded that the meteor showers are the remnants of comets. In particular, he calculated the comet 1862 III as BRAMON is a meteor-monitoring network that was created parent body of the Perseids meteors and comet 1866 I as the in 2014 to record and study meteors over Brazil. The main source for the Leonids (Schiaparelli, 1867a; 1867b). goals of the network are the search for new meteor showers, as well as the work to provide more detailed information The relationship between comets and meteor showers was about very bright bolides and meteorite-dropping meteors only widely accepted after the confirmation, in 1872, of the (Zurita et al., 2019). Taking advantage of its large latitude association of the intense meteor shower of the coverage, extending from 2ºS to 30ºS, and privileged Andromedids with comet 3D/Biela, correctly predicted position in the southern hemisphere (Amaral et al., 2018), years before (Weiss, 1868). BRAMON accumulated thousands of meteor orbits over 7 years of activity. The collected data has allowed the search Not only comets can be listed as parent bodies of a meteor for meteor radiants and to update the already cataloged shower. Many asteroids have been identified as having a meteor showers with new orbits. As a result of this effort, it similar orbit as the Taurids meteor shower (Clube and was possible to create BRAMON’s own meteor orbit Napler, 1984). Since then, many other associations with database, made available along with the EDMOND’s meteor showers have emerged (Porubčan et al., 2004). database1 (Amaral et al., 2018). There are several examples of association between asteroids The production of a large meteor database and the study of and meteor showers (Jopek and Williams, 2013): the the meteor orbit patterns are the basis of the meteor shower Quadrantids (QUA) meteor shower is associated with the studies. comet C/1490Y1 and the asteroid 2003 EH1 (Jenniskens, 2004; Williams et al., 2004; Micheli et al., 2008); the For a long time, the meteor phenomenon was associated Geminids (GEM) meteor shower is associated with asteroid with atmospheric effects of terrestrial origin. This Phaethon (Whipple, 1983); and the Taurid complex is Aristotelian model remained in force until the beginning of related with the comet P/Encke (Wipple and El-Din Hamid, the 19th century. In 1861 Schiaparelli discovered the 1952). asteroid Hesperia. Five years later he demonstrated that some meteors had orbits similar to some comets and 1 https://www.meteornews.net/edmond/ © eMeteorNews 297 2021 – 4 eMeteorNews The origin of the meteor showers had been solved. But the (perihelion distance), e (eccentricity), i (inclination), ω perception was that meteoroid streams were not (argument of perihelion) and Ω (longitude of the ascending homogeneous in space. With systematic observations over node). For meteoroids that are part of the meteor showers, many years, the fluctuations in the rates of the occurrences in addition to the Keplerian orbital elements, it is necessary of meteors could be monitored. An example of this occurred to compare all these orbits using a similarity criterion. The with the Leonids. In 1833 there was a real meteor storm, but most common way to measure similarity between orbits is in the following years the ZHR (zenithal hourly rate) by the concept of the so-called discriminant criterion or D- remained much lower, with cyclical fluctuations increasing criterion. D-criterion methods seek to measure the distance the rates every 33 years. between two N-dimensional points in space, using the orbital elements of orbits that are evaluated. Thus, the activity of meteor showers can be classified into two groups: annual showers, which are visible every single During the development of D-criteria, different authors year within a defined date range and predictable activity implemented distinct mathematical expressions, using rate, and the outbursts, in which the occurrence of a high different numbers of orbital parameters. In this paper the rate of meteors in a given year does not necessarily happen authors
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