BRAMS Annual Meeting 2019
Total Page：16
File Type：pdf, Size：1020Kb
Load more
Recommended publications
-
A Guide to Smartphone Astrophotography National Aeronautics and Space Administration
National Aeronautics and Space Administration A Guide to Smartphone Astrophotography National Aeronautics and Space Administration A Guide to Smartphone Astrophotography A Guide to Smartphone Astrophotography Dr. Sten Odenwald NASA Space Science Education Consortium Goddard Space Flight Center Greenbelt, Maryland Cover designs and editing by Abbey Interrante Cover illustrations Front: Aurora (Elizabeth Macdonald), moon (Spencer Collins), star trails (Donald Noor), Orion nebula (Christian Harris), solar eclipse (Christopher Jones), Milky Way (Shun-Chia Yang), satellite streaks (Stanislav Kaniansky),sunspot (Michael Seeboerger-Weichselbaum),sun dogs (Billy Heather). Back: Milky Way (Gabriel Clark) Two front cover designs are provided with this book. To conserve toner, begin document printing with the second cover. This product is supported by NASA under cooperative agreement number NNH15ZDA004C. [1] Table of Contents Introduction.................................................................................................................................................... 5 How to use this book ..................................................................................................................................... 9 1.0 Light Pollution ....................................................................................................................................... 12 2.0 Cameras ................................................................................................................................................ -
The 2019 Meteor Shower Activity Forecast for Low Earth Orbit 1 Overview
NASA METEOROID ENVIRONMENT OFFICE The 2019 meteor shower activity forecast for low Earth orbit Issued 15 October 2018 The purpose of this document is to provide a forecast of major meteor shower activity in low Earth orbit. Several meteor showers – the Draconids, Perseids, eta Aquariids, Orionids, and potentially the Androme- dids – are predicted to exhibit increased rates in 2019. However, no storms (meteor showers with visual rates exceeding 1000 [1, 2]) are predicted. 1 Overview Both the MSFC stream model [3] and the Egal et al. Draconid model [4] predict a second Draconid outburst in 2019. The 2019 Draconids are expected to have nearly the same level of activity as the 2018 Draconids, which reached a zenithal hourly rate (or ZHR) of about 100. Twin outbursts also occurred in 2011 and 2012 [5, 6]. The Perseids, eta Aquariids, and Orionids are expected to show mild enhancements over their baseline activity level in 2019. The Perseids are expected to be slightly more active in 2019 than in 2018, with a peak ZHR around 112. The eta Aquariids and Orionids, which belong to a single meteoroid stream generated by comet 1P/Halley, are thought to have a 12-year activity cycle and are currently increasing in activity from year to year. A review of eta Aquariid literature [7, 8, 9, 10] also indicates that the overall activity level is higher than previously believed, and this is reflected in higher forecasted rates (a ZHR of 75) and fluxes for this shower. We may see enhanced beta Taurid activity in 2019. The beta Taurids are part of the same stream as the Northern and Southern Taurids but produce daytime meteors. -
Spectra and Physical Properties of Taurid Meteoroids
Spectra and physical properties of Taurid meteoroids Pavol Matloviˇca, Juraj T´otha, Regina Rudawskab, Leonard Kornoˇsa aFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia bESA European Space Research and Technology Centre, Noordwijk, Netherlands Abstract Taurids are an extensive stream of particles produced by comet 2P/Encke, which can be observed mainly in October and November as a series of me- teor showers rich in bright fireballs. Several near-Earth asteroids have also been linked with the meteoroid complex, and recently the orbits of two car- bonaceous meteorites were proposed to be related to the stream, raising interesting questions about the origin of the complex and the composition of 2P/Encke. Our aim is to investigate the nature and diversity of Taurid mete- oroids by studying their spectral, orbital, and physical properties determined from video meteor observations. Here we analyze 33 Taurid meteor spectra captured during the predicted outburst in November 2015 by stations in Slo- vakia and Chile, including 14 multi-station observations for which the orbital elements, material strength parameters, dynamic pressures, and mineralog- ical densities were determined. It was found that while orbits of the 2015 Taurids show similarities with several associated asteroids, the obtained spec- tral and physical characteristics point towards cometary origin with highly heterogeneous content. Observed spectra exhibited large dispersion of iron content and significant Na intensity in all cases. The determined material strengths are typically cometary in the KB classification, while PE criterion is on average close to values characteristic for carbonaceous bodies. The studied meteoroids were found to break up under low dynamic pressures of 0.02 - 0.10 MPa, and were characterized by low mineralogical densities of 1.3 arXiv:1704.06482v1 [astro-ph.EP] 21 Apr 2017 - 2.5 g cm-3. -
MSS30-2009.Pdf
MSS-120 (2008 年 10 月 5 日) ふたご座流星群の等級別出現数（VMDB より） 内山茂男 1. VMDB とは ＊ IMO（国際流星機構）の収集した眼視観測データ ＊ Visual Meteor Data Base （http://www.imo.net/data/visual） ＊ Rate data と Mag data がある。基本的に Mag data を使用。ただし、Mag data には Teff と F が記 載されていないため、Rate data との照合が必要。 2. データ使用条件 (1) 月明かりの影響が少ない年（1993、1996、1998、1999、2001、2002、2004、2007 年） (2) 輻射点高度 25 度以上 (3) 視野遮蔽係数 F が 1.4 未満（雲量 2.9 未満） (4) 観測区分時間 2 時間以内 (5) 個人補正（最微星補正）の絶対値が 1.0 等未満 (6) 最微星 5.0 等以上 かつ 個人補正後の最微星 5.0 等以上 3. 使用データ量 年 1993 1996 1998 1999 2001 2002 2004 2007 合計 観測時間(hr) 58.8 124.9 106.5 170.6 160.1 107.0 317.7 252.9 1298.3 群流星数 4646 7206 5309 8812 8577 5473 20727 12492 73242 等級 ≦-5 -4 -3 -2 -1 0 1 2 3 4 5 流星数 165 244.5 596.5 1545.5 3377.5 6763.5 10519 14808 16651 12194 4986.5 4. 全ふたご群 ZHR 5. ローレンツ曲線 2 Wh ZHR = ZHRmax × 2 2 (T − Tmax ) +Wh 極大値 ZHRmax、極大太陽黄経 Tmax、半値半幅 Wh（極 大前 Wa と極大後 Wd）の値は、最小二乗法（誤差で 重み）で決定。 ※ 各等級の極大時刻はピークだけでなく全体の出現 状況から決定 6. 等級別 ZHR (ZHRm) 集計結果 （※ ピンクのラインは全 ZHR と同じ形で各 ZHRm の極大値に合わせたもの） Ls,max = 262.33 – 0.055･M (1 等級あたり 1.3 時間変化） Wa = 0.956 + 0.088･M Wd = 0.390 + 0.029･M FWHM= 1.347 + 0.119･M (FWHM は 1 等級あたり 2.8 時間変化） ＭＳＳ－１２１用 観測結果 ペルセウス群輻射点拡大撮影 重野好彦 撮影日時 ２００８年８月１１／１２日 ００時００分から０３時３２分（ＪＳＴ） １２／１３日 ００時３０分から０４時００分（ＪＳＴ） 観測地 新潟八海山 撮影機材 ＩＩによる動画像(DV-AVI)撮影 高橋Ｐ型＋ビクセンモードラ自動ガイド レンズ５０ｍｍＦ１．４ 写野 ２０度×１５度 撮影方向 ペルセウス座流星群輻射点 画像処理 ペルセウス群１３流星（１１／１２）、１２流星（１２／１３）をコンポジット 2008.08.11/12 2006.08.13/14 50mm F1.4 170mm F2.4 2008.08.12/13 50mm F1.4 !"#$%&' ()* +,-./012345 1. -
Blood ^ Relations
.S5 BLOOD ^ RELATIONS at« *-^ % ^m^ ^> 4F OYSTER PERPETUAL SUBMARINER DATE ARE FOR AN OFFICIAL ROLEX JEWELER CALL I -800-367-6539. ROLEX * OYSTER PERPETUAL AND SUBMARINER TRADEMARKS NEW YORK DAVID DOUBILET .Underwater photographer. Explorer. Artist. Marine naturalist and protector of the ocean habitat. Author of a dozen books on the sea. For 50 years, his passion has illuminated the hidden depths of the earth. \ ROLEX. ACROWN FOR EVERY ACHIEVEMENT. They'll remember this year forever Why not give them a gift that will last that long? THE 2008 UNITED STATES MINT SILVER PROOF SET" IS HERE — $44.95 No doubt someone in your life is celebrating something special this year. Mark the occasion with a timeless silver proof set, featuring great Americans in sharp detail. Seven coins are struck in 90% silver, and all are encased in special display lenses. These extraordinarily brilliant coins are a perfect way to commemorate a birthday or other milestone. It's a gift they'll appreciate for years to come. FOR GENUINE UNITED STATES MINT PRODUCTS, VISIT WWW.USMINT.GOV OR CALL 1.800. USA. MINT. GENUINELY WORTHWHILE ) UNITED STATES MINT ©2008 United States Mint r .i\ i www.naturamistorymaq.com NOVEMBER 2008 VOLUME 117 NUMBER 9 FE ATU R ES COVER STORY 22 THE CURIOUS, BLOODY LIVES OF VAMPIRE BATS Some of the most highly specialized mammals on the planet have adapted in fascinating ways to a blood diet. BY BILL SCHUTT 28 ICE ON THE EDGE The fate of West Antarctica's ice shelves may determine how far sea level rises around the world. -
Jopekkokhirova2021.Pdf
ИЗВЕСТИЯ НАЦИОНАЛЬНОЙ АКАДЕМИИ НАУК ТАДЖИКИСТАНА ОТДЕЛЕНИЕ ФИЗИКО-МАТЕМАТИЧЕСКИХ, ХИМИЧЕСКИХ, ГЕОЛОГИЧЕСКИХ И ТЕХНИЧЕСКИХ НАУК №2 (183), 2021 г. АСТРОНОМИЯ УДК 523.532 T.J.JOPEK, G.I.KOKHIROVA*, P.JENNISKENS**, D.JANCHES***, M.HAJDUKOVA*****, R.RUDAWSKA****** IAU METEOR DATA CENTER: THE SHOWER DATABASE Astronomical Observatory Institute, Faculty of Physics, A. M. University, Poznan, Poland, **Institute of Astrophysics, National Academy of Sciences of Tajikistan, ***SETI Institute, 189 Bernardo Ave, Mountain View, CA, 94043, USA, ****NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA, *****Astronomical Institute of the Slovak Academy of Sciences, Bratislava, Slovakia, ******ESA/ESTEC, Keplerlaan 1, 2201, AZ Noordwijk, the Netherlands Поступила в редакцию 22.01.2021 г. The IAU Working Group on Meteor Shower Nomenclature was established in 2006 to regulate the nomenclature of meteor showers reported in the scientific literature. One year later the International Astronomical Union Meteor Data Center shower database was implemented (IAU MDC). The database does not contain all information about the meteor showers. Its purpose is to give each new meteoroid stream, published in the scientific literature, a unique name and codes. During the “Meteoroids 2019” conference held in Bratislava, the IAU Working Group on Meteor Shower Nomenclature established new rules for the introduction and removal of meteor showers from the MDC. In this paper, we present a concise description of the meteor shower database, its origin, and struc- ture and, in particular, the current requirements for the introduction of new data, and unknown as well as known meteor showers. Key words: meteoroid stream, meteor shower, IAU MDC shower database, meteor shower nomenclature rules, new meteor shower submission rules. -
Meteor Showers
Gary W. Kronk Meteor Showers An Annotated Catalog Second Edition The Patrick Moore The Patrick Moore Practical Astronomy Series For further volumes: http://www.springer.com/series/3192 Meteor Showers An Annotated Catalog Gary W. Kronk Second Edition Gary W. Kronk Hillsboro , MO , USA ISSN 1431-9756 ISBN 978-1-4614-7896-6 ISBN 978-1-4614-7897-3 (eBook) DOI 10.1007/978-1-4614-7897-3 Springer New York Heidelberg Dordrecht London Library of Congress Control Number: 2013948919 © Springer Science+Business Media New York 1988, 2014 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, speci fi cally the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on micro fi lms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied speci fi cally for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. -
Meteor News Cover
2021 – 6 eMeteorNews Contents Esko Lyytinen (1942–2020) M. Gritsevich, P. Jenniskens and P. Roggemans ..................................................................................... 449 Perseid outburst 2021 P. Jenniskens and K. Miskotte ................................................................................................................. 460 Enhanced κ-Cygnid (KCG#0012) activity in 2021 P. Jenniskens ........................................................................................................................................... 462 Fireballs recorded between May and July 2021 by the Southwestern Europe Meteor Network J.M. Madiedo, J.L. Ortiz, J. Izquierdo, P. Santos-Sanz, J. Aceituno, E. de Guindos, P. Yanguas, J. Palacián, A. San Segundo and D. Ávila .................................................................................................. 464 A possible new meteor shower in August during the Perseids V. Velkov ................................................................................................................................................. 472 Spring 2021 observations from Ermelo (Netherlands) and Any Martin Rieux (France) K. Miskotte .............................................................................................................................................. 480 June 2021 report CAMS BeNeLux P. Roggemans .......................................................................................................................................... 487 Delta-Aquariids 2021 by -
Signatures of Meteor Showers and Sporadics Inferred from the Height Distribution Of
1 2 Signatures of meteor showers and sporadics inferred from the height distribution of 3 meteor echoes 4 5 Renata Lukianova1,2, Alexander Kozlovsky3, Mark Lester4 6 7 1Space Research Institute, Moscow, Russia 8 2 Saint-Petersburg State University, Russia 9 3Sodankylä Geophysical Observatory, Sodankylä, Finland 10 4Department of Physics and Astronomy, University of Leicester, Leicester, UK 11 12 Corresponding author: Renata Lukianova, e-mail: [email protected] 13 Address: 84/32 Profsoyuznaya Str., Moscow Russia 117997. Phone #: +7(495)333-52-12 14 15 Abstract 16 17 The SKYiMET meteor radar is capable of measuring the height distribution of ionized 18 meteor trails. Observations of the Sodankyla radar (67°N, 23°E) in 2008-2019 are 19 analyzed. A method is applied, based on the median and quartiles of meteor heights, for 20 distinguishing meteor showers from much more intense background sporadic meteors. 21 Since the shower meteors are commonly less dense and enter the Earth’s atmosphere at a 22 larger velocity, they produce ionization up to 3 km higher than sporadic meteors. This 23 effect manifests itself in the form of narrow peaks that are clearly visible in the median and 24 quartiles of the meteor height. Seven established showers with zenith hourly rate (ZHR) > 25 12 were identified. In addition, using both the height parameters and the radiant 1 26 distribution, a signature of a former meteor stream evolving into sporadic meteors is found. 27 This additional sporadic inflow has an antihelion source and occurs in the January. 28 29 Key words: meteor radar, meteor shower, sporadic meteors, height profile of meteor 30 echoes, radiant distribution of meteors 31 32 Highlights 33 34 • Parameters of the vertical profile of daily meteor echoes from the Sodankyla SKYiMET 35 meteor radar (67N) are calculated. -
Suborbital Observations of Meteor Showers
Suborbital observations of meteor showers: finding the parent bodies of our daytime showers Peter Jenniskens1 (1SETI Institute, Mountain View, California, USA; [email protected]) Summary Manned suborbital flights will on occasion observe meteors from daytime meteor showers against a dark sky background all around the spacecraft. This enables optical observations, which can help trace the meteoroids back to their Near Earth Object parent body source, by measuring fundamental physical properties of their matter released as mm-cm sized grains. Introduction What meteor showers will delight the suborbital researchers who go up to the 80-100 km altitude range where hypervelocity meteoroids flare into bright lights? If the first flights will be daytime flights, that could be daytime meteor showers! When the spacecraft gains altitude, the sky Figure1: November 2010 night-time showers, as darkens. Against this dark daytime sky, meteors measured by CAMS (Jenniskens et al., 2011). can be studied by optical techniques. Daytime showers and the Daytime zeta Perseids and Daytime beta The International Astronomical Union recognizes 8 Taurids, twins of the night-time Northern and meteor showers that carry the predicate “Daytime” Southern Taurid showers shown in Figure 1. Their (Table 1). These are defined as approaching Earth precise relation and origin (2P/Encke?) remains from a direction within 32º of the Sun. Such unclear at present. At the end of September, the meteoroid streams approach from the Sun, but Daytime Sextantids are strong, originating from light up everywhere around the spacecraft when asteroid 2005 UD and related to asteroid 3200 the Sun is up. Another 34 such showers are in the Phaethon and the Geminids. -
The 2018 Meteor Shower Activity Forecast for Earth Orbit Issued October 13, 2017
https://ntrs.nasa.gov/search.jsp?R=20170012378 2019-08-30T16:52:40+00:00Z View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by NASA Technical Reports Server The 2018 Meteor Shower Activity Forecast for Earth Orbit Issued October 13, 2017 Althea Moorhead Bill Cooke Danielle Moser Meteoroid Environment Office Meteoroid Environment Office Jacobs, ESSSA Group Marshall Space Flight Center Marshall Space Flight Center Marshall Space Flight Center (256) 544-7352 (256) 544-9136 (256) 544-2423 [email protected] [email protected] [email protected] Overview A number of meteor showers – the Ursids, Perseids, Leonids, eta Aquariids, Orionids, Draconids, and Andromedids – are predicted to exhibit increased rates in 2018. However, no major storms are predicted, and none of these enhanced showers outranks the typical activity of the Arietids, Southern delta Aquariids, and Geminids at small particle sizes. The MSFC stream model1 predicts higher than usual activity for the Ursid meteor shower in December 2018. While we expect an increase in activity, rates will fall short of the shower’s historical outbursts in 1945 and 1986 when the zenithal hourly rate (ZHR) exceeded 100. Instead, the expected rate for 2018 is around 70. The Perseids, Leonids, eta Aquariids, and Orionids are expected to show mild enhancements over their baseline activity level in 2018. In the case of the Perseids, we may see an additional peak in activity a few hours before the traditional peak, but we do not expect activity levels as high as those seen in 2016 and 2017. -
A Meteoroid Stream Survey Using the Canadian Meteor Orbit Radar II: Identification of Minor Showers Using a 3D Wavelet Transform
Icarus 207 (2010) 66–81 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus A meteoroid stream survey using the Canadian Meteor Orbit Radar II: Identification of minor showers using a 3D wavelet transform P. Brown *, D.K. Wong, R.J. Weryk, P. Wiegert Dept. of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada N6A 3K7 article info abstract Article history: A 7 year survey using the Canadian Meteor Orbit Radar (CMOR), a specular backscattering orbital radar, Received 23 July 2009 has produced three million individually measured meteoroid orbits for particles with mean mass near Revised 29 September 2009 10À7 kg. We apply a 3D wavelet transform to our measured velocity vectors, partitioning them into 1° Accepted 7 November 2009 solar longitude bins while stacking all 7 years of data into a single ‘‘virtual” year to search for showers Available online 23 November 2009 which show annual activity and last for at least 3 days. Our automated stream search algorithm has identified 117 meteor showers. We have recovered 42 of the 45 previously described streams from Keywords: our first reconnaissance survey (Brown, P., Weryk, R.J., Wong, D.K., Jones, J. [2008]. Icarus 195, Meteors 317–339). Removing possible duplicate showers from the automated results leaves 109 total streams. Asteroids Comets These include 42 identified in survey I and at least 62 newly identified streams. Our large data sample Radar observations and the enhanced sensitivity of the 3D wavelet search compared to our earlier survey have allowed us Interplanetary dust to extend the period of activity for several major showers.