Articles Trajectories in the Coma of Comet 67P J

Total Page:16

File Type:pdf, Size:1020Kb

Articles Trajectories in the Coma of Comet 67P J ISBN 978-2-87355-033-2 Proceedings of the International Meteor Conference Bollmannsruh, Germany, 2019 October 3 – 6 Published by the International Meteor Organization Edited by Urˇska Pajer, J¨urgen Rendtel, Marc Gyssens and Cis Verbeeck . Copyright notices: c 2020 The International Meteor Organization. The copyright of papers submitted to the IMC Proceedings remains with the authors. It is the aim of the IMO to increase the spread of scientific information, not to restrict it. When material is submitted to the IMO for publication, this is taken as indicating that the author(s) grant(s) permission for the IMO to publish this material any number of times, in any format(s), without payment. This permission is taken as covering rights to reproduce both the content of the material and its form and appearance, including images and typesetting. Formats may include paper and electronically readable storage media. Other than these conditions, all rights remain with the author(s). When material is submitted for publication, this is also taken as indicating that the author(s) claim(s) the right to grant the permissions described above. The reader is granted permission to make unaltered copies of any part of the document for personal use, as well as for non-commercial and unpaid sharing of the information with third parties, provided the source and publisher are mentioned. For any other type of copying or distribution, prior written permission from the publisher is mandatory. Editing and printing: Front cover picture: Logo of the IMC 2019, by Felice Meer. Publisher: The International Meteor Organization Printed: The International Meteor Organization Editors: Urˇska Pajer, J¨urgen Rendtel, Marc Gyssens, Cis Verbeeck Bibliographic records: all papers are listed with the SAO/NASA Astrophysics Data System (ADS) http://adsabs.harvard.edu with publication code 2019pimo.conf. Distribution: Further copies of this publication may be ordered from the International Meteor Organization, through the IMO website (http://www.imo.net). Legal address: International Meteor Organization, Mattheessensstraat 60, 2540 Hove, Belgium. ISBN 978-2-87355-033-2 Proceedings of the International Meteor Conference Bollmannsruh, Germany, 2019 October 3 – 6 Published by the International Meteor Organization Edited by Urˇska Pajer, J¨urgen Rendtel, Marc Gyssens and Cis Verbeeck The IMC 2019 was supported by: Some impressions from the conference: Opening and registration Talks and excursion with cake buffet. Early morning silence at the lake. Proceedings of the IMC, Bollmannsruh, 2019 1 Table of contents Editors’ notes........................................ ................................................... 4 Organizer’s notes...................................... ................................................... .5 Program of the IMC 2019 . .............................................7 List of participants..................................... ................................................... .10 Video (FRIPON and AllSky6) NEMO Vol 3. – Status of the NEar real-time MOnitoring system T. Ott, E. Drolshagen, D. Koschny, G. Drolshagen, C. Pilger, P. Mialle, J. Vaubaillon, and B. Poppe . 11 FRIPON vs. AllSky6: a practical comparison S. Molau ................................................... ............................................17 The AllSky6 and Video Meteor Program of the AMS Ltd. M. Hankey, V. Perlerin and D. Meisel ................................................... 21 FRIPON first results after 3 years of observations F. Colas, B. Zanda, S. Jeanne, M. Birlan, S. Bouley, P. Vernazza, J.L. Rault and J. Gattacceca . .26 Radio observations BRAMS forward scatter observations of major meteor showers in 2016–2019 C. Verbeeck, H. Lamy, S. Calders, A. Mart´ınez Picar, A. Calegaro ......................................27 The Radio Meteor Zoo: identifying meteor echoes using artificial intelligence S. Calders, S. Draulans, T. Calders, H. Lamy ................................................... 32 Calibration of the BRAMS interferometer H. Lamy, M. Anciaux, S. Ranvier, A. Mart´ınez Picar, S. Calders, A. Calegaro, C. Verbeeck . 33 The BRAMS receiving station v2.0 M. Anciaux, H. Lamy, A. Mart´ınez Picar, S. Ranvier, S. Calders, A. Calegaro, C. Verbeeck . 39 Meteoroid properties Mass determination of iron meteoroids D. Capek,ˇ P. Koten, J. Boroviˇcka, V. Voj´aˇcek,P. Spurn´y, R. Storkˇ ....................................43 The study of meteoroid parameters with multi-techniques data A. Kartashova, Y. Rybnov, O. Popova, D. Glazachev, G. Bolgova, V. Efremov .........................45 Simulation of meteors by TC-LIBS: advantages, limits and challenges M. Ferus, A. Kˇrivkov´a, L. Petera, V. Laitl, L. Lenˇza, J. Koukal, A. Kn´ıˇzek, J. Srba, N. Schmidt, P. Boh´aˇcek,S. Civiˇs, M. Kr˚us, J. Kub´at, L. Palouˇsov´a, E. Chatzitheodoridis, P. Kubel´ık . 47 A spectral mystery B. Ward ................................................... ............................................55 Video and visual MeteorFlux reloaded S. Molau ................................................... ............................................57 Double and triple meteor detections I. Fernini, M. Talafha, A. Al-Owais, Y. Eisa Yousef Doostkam, M. Sharif, M. Al-Naser, S. Zarafshan, H. Al-Naimiy, A. Hassan Harriri, I. Abu-Jami1, S. Subhi, Y. Al-Nahdi, R. Fernini, A. Omar Adwan ................................................... 60 Minor meteor shower anomalies: predictions and observations J. Rendtel ................................................... ...........................................63 School of Meteor Astronomy at Petnica Science Center D. Pavlovi´c,V. Luki´c ................................................... ...............................69 2 Proceedings of the IMC, Bollmannsruh, 2019 Table of contents (contd.) Parent bodies, showers, sporadics Meteor pairs among Geminids P. Koten, D. Capek,ˇ P. Spurn´y, R. Stork,ˇ V. Vojaˇcek,J. Bedn´aˇr .......................................70 Analysis of a boulder in the surroundings of 67P J. Marin-Yaseli de la Parra, M. Kueppers and the OSIRIS-Team .......................................74 Parent bodies of some minor meteor showers L. Nesluˇsan, M. Hajdukov´a ................................................... ..........................76 Modelling and analysis Where are the missing fireballs? A.´ Kereszturi and V. Steinmann ................................................... ....................80 Impact fluxes on the Columbus module of the ISS: survey and predictions G. Drolshagen, M. Klaß, R. Putzar, D. Koschny, B. Poppe .............................................86 De-biasing of meteor radiant distributions obtained by the Canary Island Long-Baseline Observatory (CILBO) A. Rietze, D. Koschny, G. Drolshagen, B. Poppe ................................................... 90 How to test whether the magnitude distribution of the meteors is exponential J. Richter ................................................... ...........................................95 Video observation networks and campaigns 3414–2018: a Perseid fireball with exceptional light effects P.C. Slansky ................................................... ........................................98 Results of the Polish Fireball Network in 2018 ,M. Wi´sniewski, P. Zo˙ ladek,֒ A. Olech, A. Raj, Z. Tyminski, M. Maciejewski, K. Fietkiewicz M. Myszkiewicz, M.P. Gawro´nski, T. Suchodolski, M. Stolarz and M. Gozdalski . 102 Beta Taurids video campaign ,P. Zo˙ ladek,֒ A. Olech, M. Wi´sniewski, M. Beben,֒ H. Dr´o˙zd˙z, M. Gawro´nski, K. Fietkiewicz A. Ja´skiewicz, M. Krasnowski, H. Krygiel, T. Krzy˙zanowski, M. Kwinta, J. Laskowski, Z. Laskowski, T.Lojek, M. Maciejewski, M. Myszkiewicz, P. Nowak, P. Onyszczuk, K. Polak, K. Polakowski, A. Raj, A. Skoczewski, M. Szlagor, Z. Tymi´nski, J. Twardowski, W. Wegrzyk,֒ P. Zareba֒ . .106 AMOS and interesting fireballs J. T´oth, P. Matloviˇc,L. Kornoˇs, P. Zigo, D. Kalmanˇcek,J. Simon,ˇ J. Silha,ˇ J. Vil´agi, B. Bal´aˇz, P. Vereˇs 109 Instruments, software A little tour across the wonderful realm of meteor radiometry J.-L. Rault, F. Colas ................................................... ...............................112 FRIPON Network internal structure A. Malgoyre Adrien, F. Colas ................................................... 118 Optimizing the scientific output of satellite formation for a stereoscopic meteor observation J. Petri, J. Zink, S. Klinkner ................................................... 119 Investigation of meteor properties using a numerical simulation M. Bal´aˇz, J. T´oth, P. Vereˇs ................................................... 126 The Bridge of Spies P.C. Slansky ................................................... .......................................133 Proceedings of the IMC, Bollmannsruh, 2019 3 Table of contents (contd.) Fireballs and meteorites Daytime fireball capturing F. Bettonvil ................................................... ........................................135 The daylight fireball of September 12, 2019 S. Molau, J. Strunk, M. Hankey, A. Kn¨ofel, A. M¨oller, W. Hamburg ..................................140 ESA’s activities on fireballs in Planetary Defence R. Rudawska, N. Artemieva, J. L. Cano, R. Cennamo, L. Faggioli, R. Jehn, D. Koschny, R. Luther, J. Mart´ın-Avila,´ M. Micheli, K. W¨unnemann ..............................................143 Provision of European Network Fireball Data A. Margonis, S. Elgner, D. Heinlein, D. Koschny, R. Rudawska, L. Faggioli, J. Oberst . 147 Evidence of shock metamorphism
Recommended publications
  • Projects on the Move
    :FDDLE@KP Free Software Projects 8elg$kf$[Xk\fm\im`\nf]]i\\jf]knXi\Xe[`kjdXb\ij GIFA<:KJFEK?<DFM< Finally there’s a free alternative to the proprietary Flash on the web. Unfortunately, it implements Microsoft technology whose software patents might render the free Moonlight license useless. BY CARSTEN SCHNOBER Microsoft and Novell formed an alliance Flash format as a global standard for problems to newcomers because you can with the aim of establishing a Flash al- complex, interactive web content. The download a prebuilt version of the pl- ternative for Linux. After one year of co- proprietary browser plugin by Adobe is ugin from the project website and click operation between developers from both like a red flag to a bull for many Linux to install (Figure 1). Thus far, Moonlight companies, a beta version of the Silve- users. Because the source code is not supports only Linux systems using Fire- light free implementation, Moonlight, is available, developers and users of the fox, although the makers claim that it now available. Many members of the free operating system have been forced will support OpenSolaris and the Kon- Linux community suspect that the to rely on Adobe providing updates. In queror and Opera browsers in the near Moonlight Linux implementation [1] is the past, Adobe has been reticent with future. being used to establish Microsoft's Sil- respect to timeliness and completeness. For licensing reasons, the binary pack- verlight [2] technology on a cross-plat- age leaves out all multimedia codecs, form basis, thereby infiltrating the soft- ;Xe^\ijXe[9\e\]`kj thus seriously limiting its own function- ware freedom fighters’ fortress.
    [Show full text]
  • Rich Internet Applications
    Rich Internet Applications (RIAs) A Comparison Between Adobe Flex, JavaFX and Microsoft Silverlight Master of Science Thesis in the Programme Software Engineering and Technology CARL-DAVID GRANBÄCK Department of Computer Science and Engineering CHALMERS UNIVERSITY OF TECHNOLOGY UNIVERSITY OF GOTHENBURG Göteborg, Sweden, October 2009 The Author grants to Chalmers University of Technology and University of Gothenburg the non-exclusive right to publish the Work electronically and in a non-commercial purpose make it accessible on the Internet. The Author warrants that he/she is the author to the Work, and warrants that the Work does not contain text, pictures or other material that violates copyright law. The Author shall, when transferring the rights of the Work to a third party (for example a publisher or a company), acknowledge the third party about this agreement. If the Author has signed a copyright agreement with a third party regarding the Work, the Author warrants hereby that he/she has obtained any necessary permission from this third party to let Chalmers University of Technology and University of Gothenburg store the Work electronically and make it accessible on the Internet. Rich Internet Applications (RIAs) A Comparison Between Adobe Flex, JavaFX and Microsoft Silverlight CARL-DAVID GRANBÄCK © CARL-DAVID GRANBÄCK, October 2009. Examiner: BJÖRN VON SYDOW Department of Computer Science and Engineering Chalmers University of Technology SE-412 96 Göteborg Sweden Telephone + 46 (0)31-772 1000 Department of Computer Science and Engineering Göteborg, Sweden, October 2009 Abstract This Master's thesis report describes and compares the three Rich Internet Application !RIA" frameworks Adobe Flex, JavaFX and Microsoft Silverlight.
    [Show full text]
  • The Paleoecology and Fire History from Crater Lake
    THE PALEOECOLOGY AND FIRE HISTORY FROM CRATER LAKE, COLORADO: THE LAST 1000 YEARS By Charles T. Mogen A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Environmental Science and Policy Northern Arizona University August 2018 Approved: R. Scott Anderson, Ph.D., Chair Nicholas P. McKay, Ph.D. Darrell S. Kaufman, Ph.D. Abstract High-resolution pollen, plant macrofossil, charcoal and pyrogenic Polycyclic Aromatic Hydrocarbon (PAH) records were developed from a 154 cm long sediment core collected from Crater Lake (37.39°N, 106.70°W; 3328 m asl), San Juan Mountains, Colorado. Several studies have explored Holocene paleo-vegetation and fire histories from mixed conifer and subalpine bogs and lakes in the San Juan and southern Rocky Mountains utilizing both palynological and charcoal studies, but most have been at relatively low resolution. In addition to presenting the highest resolution palynological study over the last 1000 years from the southern Rocky Mountains, this thesis also presents the first high-resolution pyrogenic PAH and charcoal paired analysis aimed at understanding both long-term fire history and the unresolved relationship between how each of these proxies depict paleofire events. Pollen assemblages, pollen ratios, and paleofire activity, indicated by charcoal and pyrogenic PAH records, were used to infer past climatic conditions. Although the ecosystem surrounding Crater Lake has remained a largely spruce (Picea) dominated forest, the proxies developed in this thesis suggest there were two distinct climate intervals between ~1035 to ~1350 CE and ~1350 to ~1850 CE in the southern Rocky Mountains, associated with the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA) respectively.
    [Show full text]
  • Grumbles from the Grave
    GRUMBLES FROM THE GRAVE Robert A. Heinlein Edited by Virginia Heinlein A Del Rey Book BALLANTINE BOOKS • NEW YORK For Heinlein's Children A Del Rey Book Published by Ballantine Books Copyright © 1989 by the Robert A. and Virginia Heinlein Trust, UDT 20 June 1983 All rights reserved under International and Pan-American Copyright Conventions. Published in the United States by Ballantine Books, a division of Random House, Inc., New York, and simultaneously in Canada by Random House of Canada Limited, Toronto. Grateful acknowledgment is made to the following for permission to reprint the following material: Davis Publications, Inc. Excerpts from ten letters written by John W. Campbell as editor of Astounding Science Fiction. Copyright ® 1989 by Davis Publications, Inc. Putnam Publishing Group: Excerpt from the original manuscript of Podkayne of Mars by Robert A. Heinlein. Copyright ® 1963 by Robert A. Heinlein. Reprinted by permission of the Putnam Publishing Group. Library of Congress Catalog Card Number: 89-6859 ISBN 0-345-36941-6 Manufactured in the United States of America First Hardcover Edition: January 1990 First Mass Market Edition: December 1990 CONTENTS Foreword A Short Biography of Robert A. Heinlein by Virginia Heinlein CHAPTER I In the Beginning CHAPTER II Beginnings CHAPTER III The Slicks and the Scribner's Juveniles CHAPTER IV The Last of the Juveniles CHAPTER V The Best Laid Plans CHAPTER VI About Writing Methods and Cutting CHAPTER VII Building CHAPTER VIII Fan Mail and Other Time Wasters CHAPTER IX Miscellany CHAPTER X Sales and Rejections CHAPTER XI Adult Novels CHAPTER XII Travel CHAPTER XIII Potpourri CHAPTER XIV Stranger CHAPTER XV Echoes from Stranger AFTERWORD APPENDIX A Cuts in Red Planet APPENDIX B Postlude to Podkayne of Mars—Original Version APPENDIX C Heinlein Retrospective, October 6, 1988 Bibliography Index FOREWORD This book does not contain the polished prose one normally associates with the Heinlein stories and articles of later years.
    [Show full text]
  • Book of Abstracts
    UDC 520/524(048) ISBN 978-86-80019-55-0 VIII SERBIAN-BULGARIAN ASTRONOMICAL CONFERENCE Leskovac, Serbia, May 8-12, 2012 BOOK OF ABSTRACTS Eds. Milan S. Dimitrijević and Milcho K. Tsvetkov BELGRADE 2012 SCIENTIFIC COMMITTEE LOCAL ORGANIZING COMMITTEE Milan S. Dimitrijević (Co-chairman) Milan S. Dimitrijević (Co-chairman) Milcho K. Tsvetkov (Co-chairman) Žarko Mijajlović (Co-chairman) Žarko Mijajlović (Co-vice chairman) Ognyan Kounchev (Co-vice Chairman) Scientific secretary: Tanyu Bonev Andjelka Kovačević Dimo Dimov Dragana Ilić Members: Darko Jevremović Luka Č. Popović Predrag Jovanović Darko Jevremović Andjelka Kovačević Nadežda Pejović Jelena Kovačević Petko Nedialkov Jelena Kovačević Marko Stalevski Nadežda Pejović Luka Č. Popović Tanja Milovanov Miodrag Dačić Zoran Simić Katya Tsvetkova Zoran Simić Dejan Urošević Under the auspices of Serbian Ministry of Education and Science Bulgarian Academy of Sciences ORGANIZERS: Society of Astronomers of Serbia and Astronomical Observatory Institute of Astronomy with National Astronomical Observarory, BAS Co-organizers: Faculty of Mathematics and Department of Astronomy, University of Belgrade Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences Department of Astronomy, Faculty of Physics, Sofia University ''St. Kliment Ohridski' On the front cover: Panorama of the town of Leskovac On the back cover: A forest on a secret planet, author Vladimir M. Dimitrijević Text arrangement by computer: Tatjana Milovanov Published and copyright © by Serbian Astronomical Society and Astronomical Observatory, Belgrade, Volgina 7, 11060 Belgrade, Serbia Financially supported by the Ministry of Education and Science of Serbia __________________________________________________________________ Production: “BS PRINT”, Jurija Gagarina 29v, Novi Beograd, in 100 copies UDC 520/524(048) ISBN 978-86-80019-55-0 VIII SERBIAN-BULGARIAN ASTRONOMICAL CONFERENCE Leskovac, Serbia, May 8-12, 2012 BOOK OF ABSTRACTS Eds.
    [Show full text]
  • Year XIX, Supplement Ethnographic Study And/Or a Theoretical Survey of a Their Position in the Article Should Be Clearly Indicated
    III. TITLES OF ARTICLES DRU[TVO ANTROPOLOGOV SLOVENIJE The journal of the Slovene Anthropological Society Titles (in English and Slovene) must be short, informa- SLOVENE ANTHROPOLOGICAL SOCIETY Anthropological Notebooks welcomes the submis- tive, and understandable. The title should be followed sion of papers from the field of anthropology and by the name of the author(s), their position, institutional related disciplines. Submissions are considered for affiliation, and if possible, by e-mail address. publication on the understanding that the paper is not currently under consideration for publication IV. ABSTRACT AND KEYWORDS elsewhere. It is the responsibility of the author to The abstract must give concise information about the obtain permission for using any previously published objective, the method used, the results obtained, and material. Please submit your manuscript as an e-mail the conclusions. Authors are asked to enclose in English attachment on [email protected] and enclose your contact information: name, position, and Slovene an abstract of 100 – 200 words followed institutional affiliation, address, phone number, and by three to five keywords. They must reflect the field of e-mail address. research covered in the article. English abstract should be placed at the beginning of an article and the Slovene one after the references at the end. V. NOTES A N T H R O P O L O G I C A L INSTRUCTIONS Notes should also be double-spaced and used sparingly. They must be numbered consecutively throughout the text and assembled at the end of the article just before references. VI. QUOTATIONS Short quotations (less than 30 words) should be placed in single quotation marks with double marks for quotations within quotations.
    [Show full text]
  • Download This Article in PDF Format
    A&A 598, A40 (2017) Astronomy DOI: 10.1051/0004-6361/201629659 & c ESO 2017 Astrophysics Separation and confirmation of showers? L. Neslušan1 and M. Hajduková, Jr.2 1 Astronomical Institute, Slovak Academy of Sciences, 05960 Tatranska Lomnica, Slovak Republic e-mail: [email protected] 2 Astronomical Institute, Slovak Academy of Sciences, Dubravska cesta 9, 84504 Bratislava, Slovak Republic e-mail: [email protected] Received 6 September 2016 / Accepted 30 October 2016 ABSTRACT Aims. Using IAU MDC photographic, IAU MDC CAMS video, SonotaCo video, and EDMOND video databases, we aim to separate all provable annual meteor showers from each of these databases. We intend to reveal the problems inherent in this procedure and answer the question whether the databases are complete and the methods of separation used are reliable. We aim to evaluate the statistical significance of each separated shower. In this respect, we intend to give a list of reliably separated showers rather than a list of the maximum possible number of showers. Methods. To separate the showers, we simultaneously used two methods. The use of two methods enables us to compare their results, and this can indicate the reliability of the methods. To evaluate the statistical significance, we suggest a new method based on the ideas of the break-point method. Results. We give a compilation of the showers from all four databases using both methods. Using the first (second) method, we separated 107 (133) showers, which are in at least one of the databases used. These relatively low numbers are a consequence of discarding any candidate shower with a poor statistical significance.
    [Show full text]
  • The Leonid Meteor Shower: Historical Visual Observations
    Icarus 138, 287–308 (1999) Article ID icar.1998.6074, available online at http://www.idealibrary.com on The Leonid Meteor Shower: Historical Visual Observations P. Brown Department of Physics and Astronomy, University of Western Ontario, London, Ontario, N6A 3K7, Canada E-mail: [email protected] Received July 20, 1998; revised December 10, 1998 of past showers, independent of the many secondary accounts The original visual accounts of the Leonids from 1799 to 1997 which appear in the literature, in an effort to better understand are examined and the times and magnitude of peak activity are the stream’s past activity, its formation, and as a way to predict established for 32 Leonid returns during this two-century interval. what may happen in the years from 1999 onwards. In addition, Previous secondary accounts of many of these returns are shown this revised set of historical Leonid data provides a set of obser- to differ from the information contained in the original accounts vations reduced in a common manner, which any model of the due to misinterpretations, typographical errors, and unsupported stream must be able to explain and to which others can easily assumptions. The strongest Leonid storms are shown to follow a examine and apply their own corrections. Gaussian activity profile and to occur after the perihelion passage In this work, we examine in detail available original records and nodal longitude of 55P/Tempel–Tuttle. The relationship be- tween the Gaussian width of the strongest returns and their peak of the Leonids for modern returns of the shower (here defined activity is established, and the particle density/stream width rela- to be post-1799).
    [Show full text]
  • 17. a Working List of Meteor Streams
    PRECEDING PAGE BLANK NOT FILMED. 17. A Working List of Meteor Streams ALLAN F. COOK Smithsonian Astrophysical Observatory Cambridge, Massachusetts HIS WORKING LIST which starts on the next is convinced do exist. It is perhaps still too corn- page has been compiled from the following prehensive in that there arc six streams with sources: activity near the threshold of detection by pho- tography not related to any known comet and (1) A selection by myself (Cook, 1973) from not sho_m to be active for as long as a decade. a list by Lindblad (1971a), which he found Unless activity can be confirmed in earlier or from a computer search among 2401 orbits of later years or unless an associated comet ap- meteors photographed by the Harvard Super- pears, these streams should probably be dropped Sehmidt cameras in New Mexico (McCrosky and from a later version of this list. The author will Posen, 1961) be much more receptive to suggestions for dele- (2) Five additional radiants found by tions from this list than he will be to suggestions McCrosky and Posen (1959) by a visual search for additions I;o it. Clear evidence that the thresh- among the radiants and velocities of the same old for visual detection of a stream has been 2401 meteors passed (as in the case of the June Lyrids) should (3) A further visual search among these qualify it for permanent inclusion. radiants and velocities by Cook, Lindblad, A comment on the matching sets of orbits is Marsden, McCrosky, and Posen (1973) in order. It is the directions of perihelion that (4) A computer search
    [Show full text]
  • Meteor Shower Detection with Density-Based Clustering
    Meteor Shower Detection with Density-Based Clustering Glenn Sugar1*, Althea Moorhead2, Peter Brown3, and William Cooke2 1Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305 2NASA Meteoroid Environment Office, Marshall Space Flight Center, Huntsville, AL, 35812 3Department of Physics and Astronomy, The University of Western Ontario, London N6A3K7, Canada *Corresponding author, E-mail: [email protected] Abstract We present a new method to detect meteor showers using the Density-Based Spatial Clustering of Applications with Noise algorithm (DBSCAN; Ester et al. 1996). DBSCAN is a modern cluster detection algorithm that is well suited to the problem of extracting meteor showers from all-sky camera data because of its ability to efficiently extract clusters of different shapes and sizes from large datasets. We apply this shower detection algorithm on a dataset that contains 25,885 meteor trajectories and orbits obtained from the NASA All-Sky Fireball Network and the Southern Ontario Meteor Network (SOMN). Using a distance metric based on solar longitude, geocentric velocity, and Sun-centered ecliptic radiant, we find 25 strong cluster detections and 6 weak detections in the data, all of which are good matches to known showers. We include measurement errors in our analysis to quantify the reliability of cluster occurrence and the probability that each meteor belongs to a given cluster. We validate our method through false positive/negative analysis and with a comparison to an established shower detection algorithm. 1. Introduction A meteor shower and its stream is implicitly defined to be a group of meteoroids moving in similar orbits sharing a common parentage.
    [Show full text]
  • Meteor Showers # 11.Pptx
    20-05-31 Meteor Showers Adolf Vollmy Sources of Meteors • Comets • Asteroids • Reentering debris C/2019 Y4 Atlas Brett Hardy 1 20-05-31 Terminology • Meteoroid • Meteor • Meteorite • Fireball • Bolide • Sporadic • Meteor Shower • Meteor Storm Meteors in Our Atmosphere • Mesosphere • Atmospheric heating • Radiant • Zenithal Hourly Rate (ZHR) 2 20-05-31 Equipment Lounge chair Blanket or sleeping bag Hot beverage Bug repellant - ThermaCELL Camera & tripod Tracking Viewing Considerations • Preparation ! Locate constellation ! Take a nap and set alarm ! Practice photography • Location: dark & unobstructed • Time: midnight to dawn https://earthsky.org/astronomy- essentials/earthskys-meteor-shower- guide https://www.amsmeteors.org/meteor- showers/meteor-shower-calendar/ • Where to look: 50° up & 45-60° from radiant • Challenges: fatigue, cold, insects, Moon • Recording observations ! Sky map, pen, red light & clipboard ! Time, position & location ! Recording device & time piece • Binoculars Getty 3 20-05-31 Meteor Showers • 112 confirmed meteor showers • 695 awaiting confirmation • Naming Convention ! C/2019 Y4 (Atlas) ! (3200) Phaethon June Tau Herculids (m) Parent body: 73P/Schwassmann-Wachmann Peak: June 2 – ZHR = 3 Slow moving – 15 km/s Moon: Waning Gibbous June Bootids (m) Parent body: 7p/Pons-Winnecke Peak: June 27– ZHR = variable Slow moving – 14 km/s Moon: Waxing Crescent Perseid by Brian Colville 4 20-05-31 July Delta Aquarids Parent body: 96P/Machholz Peak: July 28 – ZHR = 20 Intermediate moving – 41 km/s Moon: Waxing Gibbous Alpha
    [Show full text]
  • Fantasy & Science Fiction V030n04
    THE MA GAZINE Of Fantasy and JACK VANCE Science Fiction ISAAC ASIMOV J.T. MCINTOS NOVELETS We Can Remember It For You Wholesale Philip k. dick 4 The Sorcerer Pharesm JACK VANCE 79 SHORT STORIES Appoggiatura A. M, MARPLE 25 But Soft, What Light . CAROL EMSHWILLER 41 The Sudden Silence J. T. MCINTOSH 45 The Face Is Familiar GILBERT THOMAS 64 The Space Twins JAMES PULLEY 75 Bordered In Black LARRY NIVEN 112 FEATURES Cartoon GAHAN WILSON 24 Books JUDITH MERRIL 31 Injected Memory THEODORE L. THOMAS 62 Verse: The Octopus DORIS PITKIN BUCK 63 Science: The Nobelmen of Science ISAAC ASIMOV 101 F&SF Marketplace 129 Cover by Jack Gaughan (illustrating "The Sorcerer Pharesm”) Joseph W. Ferman, publishek Edward L. Ferman, editor Ted White, assistant editor Isaac Asimov, science editor Judith Merril, book editor Robert P. Mills, consulting editor Dale Beardale, aRCULATiON manager The Magazine of Fantasy and Science Fiction, Volume 30, No. 4, Whole No. 179, Apr. 1966. Published monthly by Mercury Press, Inc., at 504 o copy. Annual subscription $5.00; $5.50 in Canada and the Pan American Union, $6.00 in all other countries. Publication office, 10 Ferry Street, Concord, N. H. 03302. Editorial and general mail should be sent to 347 East 53rd St., New York, N. Y. 10022. Second Class postage paid at Concord, N. H. Printed in U.S.A. © 1966 by Mercury Press, Inc. All rights including translations into other languages, reserved. Submissions must be accompanied by stamped, self-addressed envelopes: the Publisher assumes no responsibility for return of unsolicited manuscripts.
    [Show full text]