Author: Paul Roggemans

May issue 2017 of Meteor News online

The online content of March and April 2017 has been edited and archived in eMeteorNews (eMN_2017_2, May issue). Feel free to share this information on Facebook or Twitter with your group, network or society. The motto of MeteorNews is to keep it simple and easy. The website allows fast exchange of results, news and experience among active meteor observers accross the world. The eZine eMN serves as archive to preserve the interesting information. One advantage of online publications is that corrections can be made all the time. In case you spot some mistake, let us know and we can...

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A meteor stream study of 1966

by Alexandra Terentjeva (Institute of Astronomy of the Russian Academy of Sciences, Moscow, Russia): ater@inasan.ru 3600 individual photographic orbits of meteor bodies and about 2000 visual meteor radiants with corresponding velocities were compiled and carefully studied in detail. 154 minor meteor streams were detected in the Solar System, their basic orbital and other data are given. Firstly some remarkable shower and stream properties are established: examples of the large elliptic radiation areas with semi-major axes perpendicular to the Ecliptic; the existence of the Northern (N) , Southern (S) and Ecliptical (Q) branches of some streams; stream-antipodes and radiant-antipodes (symmetrically arranged relatively to the Ecliptic) with angular distances from the Ecliptic to 40-80°; а number of short-perihelion streams (q ~ 0.05-0.07 A.U.); some meteor streams perpendicular to  the Ecliptic’s plane. There are also some unique meteor bodies with their orbits enclosed within the limits of the Earth’s one, or having the clockwise and anticlockwise direction in two similar orbits. Hyperbolic photographic velocities  vh = 57-88  km /sec  are treated as real ones according to the best radar and visual observations. А «bunch» of ecliptical streams, discovered in the USSR in 1950, is а complex of orbits of the mostly massive meteor particles of the Zodiacal Cloud.  The stream evolution rate is comparatively high. The total complex of sporadic meteor bodies is not totally chaotic and accidental. Introduction This work published...

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eMeteorNews now listed on ADS Abstract Service

“Who writes, who remains” One of the major problems with amateur meteor work is that a lot of all observing efforts that have been done past two centuries have been lost forever because nobody bothered to publish these results or to archive publications. What we know today about amateur meteor work in the 19th and 20th century is what has been published in the past by dedicated amateurs. Long time ago meteor observing reports were systematically published in professional scientific journals such as the Monthly Notices of the RAS, the reports of the British Association for the Advancement of...

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Variation in heights of CAMS meteor trajectories

The median values for the beginning heights, heights of maximum brightness and ending heights have been obtained for sporadic meteors and for meteors of the IAU established meteor shower list, based on the CAMS dataset 2010–2013. Two layers with larger numbers of events with in between a layer with significant less events were found. A seasonal variation in the geocentric velocity and ablation height for sporadic meteors has been found with maximum values for the median height around solar longitude 225° and minima around 45°. For individual shower meteors there is a significant number of showers that produce meteor...

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Established meteor shower activity periods and orbits

The CAMS dataset of 111233 orbits collected in the period 2010-2013 has been checked to verify the online data of the IAU meteor shower list. The activity periods for all meteor streams detected in CAMS data has been derived from the solar longitudes of the individual orbits that were associated with the meteor stream. For meteor showers that were absent in the CAMS data, mainly daylight meteor streams, CMOR data has been used to complete the information. To make future associations easier and to avoid mixing up shower data, the official naming and IAU code with the orbital elements...

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