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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 !"#$%&' ()* +,-./012345 1. 6789 : ;<,120 <5%#$=3>?@A%BC9DEFGHIJ!"KL%#$%MNOPQ[1]9RFSTU VTWXYZKLHIJKL 1AU B 10 N[%\]%^_` 50 abcd%efg$KL%hijk6lOm 9nop%e6opKqQB%rstuvpGwCxFGqyze{|fp}Cen $,4.4 N[59~pSh ijkv•€FS•xFGq‚ƒ$KLhi_„…e†‡ˆ9‰_dŠ‹9jk^6\]% 2 Œ9•^ŽF x•qy%G8•‘KL„…ehi_†’Y“GŠ‹9 1AU B 4.4 N[%^_ 1:280,000 o%ejk^6T 1/280,0002=1.3”10-13 •••(1-1) 9o–Tfg$KL%!"#$_—˜•d™š6lOmo›9o–yœe•q : •%DEe6THžŸ‚ƒ ¡¢"£¤%=¥%¦§^_IJ!fgB¨odB©ªpqQB«8¬¬–T xGTH$9•®S=¥^_¨odB¯œK°QBpœ¥±9RFSTHfg$BIJ!%=¥^6cx–² ³Lop%e6opKT• T´œFµB¶·¶tµ%Mi¸e6=¥^_¨odK|F“opqQB¹ºx FGqWXYZ%rstuvC®K»9fg$¢Mi¸T¼½¾$„KLTy“¿“À%¬Lp%!"#$ _—˜•dK•€vFS•xFGq 2. fg$ : ¥Á†’%ÂÃ>ÄBFSÅ$¢ÆÄu•uÇÈÉ_Ê$9ËfFGBC967CÌÍY“dŠ‹_ÎÏ me6opKB¯³“x•qÐÑ 10km %Å$,1015 kg5_[Ò9 1 ÓIJ9ËfFSÅ$¥Á% 1/1,000 % ÆÄu,ÔvÕxopqÅ$¥Á% 80Ö_Ô%×BFGŠ‹9ÐÑ 1km %Å$ 5 ÓMq5v†’•dBØÙ Fx•qÊ$KL 1AU ÚÛvÜÝ•dÆÄu%ÞM_IJ!"9Ìß’•BØÙ•dBTy%¥Á†’6Ê $%àáâÞÑ_ 5.2AU o%eT 1015*0.5*ã*12 /(1,000*4ã*5.22) =4.6*109 kg/[ •••(2-1) 9o–x•qÆÄu%äÈåMævÐÑ%-3.5 %çèB•dBTéäÈå%‹ê¥Á6ÐÑ%-0.5 %çè9 o–x•qz%Š‹9{ëäÈå%ÆÄu%‹ê¥Á_ìí% 68%vî8x•q{ëäÈå%hi_ÐÑ 0.1 ïm, ¥Á 2*10-19 kg,Å$%jk 1 g/cm3 % 1/5T0.2 g/cm3 vØÙ5B•dBT 4.6*109 *0.68/(2*10-19) =1.6*1028 Ó/[ •••(2-2) %hi_IJ!KL†’Y“dzB9o–x•qäÈåMævÐÑ%-3.5 Œ%çèB•dBÐÑ 1.7mm %h i,10-6 kg T2 „ð%#$äÈå5%†’6T 1.6*1028 *(1.7*104) -3.5 =2.5*1013 Ó/[ •••(2-3) •o³ñT 2.5*1013/(365*24*60*60)=7.9*105 Ó/ò •••(2-4) 9o–x•qhi_„ m9ò… 1km/s e†’Y“GBFS 4.4 N[%\]9´»dóÒjk6T 7.9*105/{1*4ã*(4.4*300,000*60*60*24*365) 2}=3.6*10-23 Ó/km3 •••(2-5) 9o–x•q©ô 10,000km,ÐÑ 112 kmTõk 112km 9´pS 1 Äö÷øùt5v 1 úÒcG–9 1km/s eÜÝ•dû÷üýÄ6T 3.6*10-23*1*10,000*60*60=1.3*10-15 Ó/ú •••(2-6) •o³ñT 1/(1.3*10-15*365*24)=8.8*1010 [/Ó •••(2-7) 9o®STþÿ[!v"ºSFxpx•q 3. 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  • Spectra and Physical Properties of Taurid Meteoroids

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    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.
  • R.A.S.C. - Belleville Centre Newsletter - May, 2007 Volume 02 - Number 05

    R.A.S.C. - Belleville Centre Newsletter - May, 2007 Volume 02 - Number 05

    R.A.S.C. - BELLEVILLE CENTRE NEWSLETTER - MAY, 2007 VOLUME 02 - NUMBER 05 Welcome to another newsletter of R.A.S.C. - Belleville Centre and to the weird, strange, odd, bizarre, peculiar, eerie, creepy, unusual, outlandish, eccentric, extra- ordinary, out-of-the-ordinary, funny, perplex and curious world of astronomy. Beginning next month, the newsletter shall be taking on a new tack/format. Your most humble of correspondents shall be initiating something that Earthlings would refer to as a "lesson" in which you will be instructed upon various topics. The lesson that is planned for next month is extensive enough that it may be required to two (2) to three (3) newsletters to accomplish and complete. Here is a list of useful information of meteor showers: Radiant Duration Maximum May Major Activity (easy) eta Aquarids 21 April - 12 May 05/06 May Z.H.A.: 60 R.A.: 22h 22m Dec.: -01.9° Minor Activity (not so easy) phi Boötids R.A.: 16h 00m Dec.: +51.0° 01 May Z.H.A.: 06 alpha Scorpiids R.A.: 16h 00m Dec.: -20.0° 03 May Z.H.A.: 06 epsilon Aquilids 04 May - 27 May 17/18 May May Librids 01 May - 09 May 06/07 May eta Lyrids 03 May - 12 May 08 May - 10 May North May Ophiuchids 08 April - 06 June 18/19 May South May Ophiuchids 21 April - 04 June 13 May - 18 May Daylight Activity (not so easy) epsilon Arietids 25 April - 27 May 09/10 May May Arietids 04 May - 06 June 16/17 May Omicron Cetids 07 May - 09 June 14 May - 25 May May Piscids 04 May - 27 May 12/13 May June tau Herculids* R.A.: 15h 12m Dec: +39.0° 03 June Z.H.R.: 15 chi Scorpiids* R.A.: 16h 28m Dec: -13.0° 05 June Z.H.R.: 10 Arietids*** R.A.: 02h 56m Dec: +23.0° 07 June Z.H.R.: 50 zeta Perseids*** R.A.: 04h 08m Dec: +23.0° 07 June Z.H.R.: 40 Librids R.A.: 15h 09m Dec: -28.3° 08 June Z.H.R.: 10 Sagittariids R.A.: 20h 16m Dec: -35.0° 11 June Z.H.R.: 30 theta Ophiuchids R.A.: 17h 48m Dec: -28.0° 13 June Z.H.R.: 02 June Lyrids* R.A.: 16h 32m Dec: +35.0° 16 June Z.H.R.: 09 Corvids* R.A.: 12h 48m Dec: -19.1° 26 June Z.H.R.: 13 Draconids R.A.: 16h 55m Dec: +56.0° 28 June Z.H.R.: 05 June Boötids.
  • Blood ^ Relations

    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.
  • Detection and Measurement of Micrometeoroids with LISA Pathfinder

    Detection and Measurement of Micrometeoroids with LISA Pathfinder

    A&A 586, A107 (2016) Astronomy DOI: 10.1051/0004-6361/201527658 & c ESO 2016 Astrophysics Detection and measurement of micrometeoroids with LISA Pathfinder J. I. Thorpe1, C. Parvini1,2, and J. M. Trigo-Rodríguez3 1 Gravitational Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA e-mail: [email protected] 2 Department of Aerospace Engineering, The George Washington University, Washington, DC 20052, USA 3 Meteorites, Minor Bodies and Planetary Sciences Group, Institute of Space Sciences (CSIC-IEEC), Campus UAB Bellaterra, Carrer de Can Magrans, s/n 08193 Cerdanyola del Vallés Barcelona, Spain Received 28 October 2015 / Accepted 23 December 2015 ABSTRACT The Solar System contains a population of dust and small particles originating from asteroids, comets, and other bodies. These par- ticles have been studied using a number of techniques ranging from in-situ satellite detectors to analysis of lunar microcraters to ground-based observations of zodiacal light. In this paper, we describe an approach for using the LISA Pathfinder (LPF) mission as an instrument to detect and characterize the dynamics of dust particles in the vicinity of Earth-Sun L1. Launched on Dec. 3rd, 2015, LPF is a dedicated technology demonstrator mission that will validate several key technologies for a future space-based gravitational-wave observatory. The primary science instrument aboard LPF is a precision accelerometer which we show will be capable of sensing discrete momentum impulses as small as 4 × 10−8 N s. We then estimate the rate of such impulses resulting from impacts of microme- teoroids based on standard models of the micrometeoroid environment in the inner solar system.
  • Jopekkokhirova2021.Pdf

    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.
  • The Astronews June 2020

    The Astronews June 2020

    The Astronews www.hawastsoc.org June 2020 A word from your editor by Inside this issue: Sapavith ‘Ort’ Vanapruks Covid-19 Notice Club Information 2 HAS have decided to cancel public HAS events for the time being, beginning with the March 14 public star party at Dillingham. Includes the up- President’s Message 2 coming in town star parties at Kahala and Geiger, as well as the monthly meeting. These cancella- tions will continue while we remain on lock down. Observer’s Notebook 3 We don't know yet what will happen with the club star party in June. We will try to update as soon as possible. Meeting Minutes 4 .There were several times in May that ISS came Event Calendar 5 over Oahu with magnitude -3.9 (May 14 20:18) & -3.6 (May 16 05:16). I tried to do a video record- ing from my camera. On May 14, there was just too much movement that I cannot keep the ISS in NASA’s Night Sky Notes 7 Focus. On May 16, I attached the camera to my refractor 80mm triplet. I have hard time keeping ISS in the scope. I also forgot to press record Meteor Log 8 button on my camera. One of this day, I will capture ISS in my camera. I went out to Kalaeloa Boat Harbor on Sunday, Treasurer’s Report 9 May 24, 2020 to take photos of crescent Moon, Mercury, and Venus. The photo did not come as good as I hope for. Enjoy. Upcoming Events: • The next Board meeting is Sun., May 31st 3:30 PM.
  • JRASC April 2021 Lo-Res

    JRASC April 2021 Lo-Res

    The Journal of The Royal Astronomical Society of Canada PROMOTING ASTRONOMY IN CANADA April/avril 2021 Volume/volume 115 Le Journal de la Société royale d’astronomie du Canada Number/numéro 2 [807] Inside this issue: Meteor Outburst in 2022? Scheduling of Light Soul Nebula The Best of Monochrome. Drawings, images in black and white, or narrow-band photography. Semaj Ragde captured this image from the tower of the Bastille during a violent uprising on July 1789, long before cameras were invented. It shows the waxing crescent Moon on an extraordinarily clear night, caught using eyepiece projection. (See inside back cover.) April / avril 2021 | Vol. 115, No. 2 | Whole Number 807 contents / table des matières Research Articles / Articles de recherche 86 CFHT Chronicles: A Big Day for SPIRou by Mary Beth Laychak 60 Will Comet 73P/Schwassmann-Wachmann 3 Produce a Meteor Outburst in 2022? 89 Astronomical Art & Artifact: Exploring the by Joe Rao History of Colonialism and Astronomy in Canada Feature Articles / Articles de fond by Randall Rosenfeld 96 John Percy’s Universe: The Death of the Sun 72 The Biological Basis for the Canadian by John R. Percy Guideline for Outdoor Lighting 5. Impact of the Scheduling of Light 98 Dish on the Cosmos: In Memoriam Arecibo by Robert Dick by Erik Rosolowsky 76 Pen and Pixel: North America Nebula and the Pelican Nebula / M22 / Flame and Orion / Departments / Départements Orion Nebula by Godfrey Booth / Ron Brecher / Klaus Brasch / 54 President’s Corner Adrian Aberdeen by Robyn Foret 55 News Notes / En manchettes Columns / Rubriques Compiled by Jay Anderson 79 Skyward: A Great Conjunction, the Christmas 100 Astrocryptic and Previous Answers Star and Orion by Curt Nason by David Levy iii Great Images 81 Binary Universe: The New Double Stars Program by James Edgar by Blake Nancarrow 84 Observing: Springtime Observing with Coma Berenices by Chris Beckett Ed Mizzi captured a beautiful region of the Soul Nebula in Cassio- Errata: peia from his backyard observatory in Waterdown, Ontario.