Optical Imaging of the Radiant Points of Leonids during the 2001 Storm with the 105 cm Kiso Schmidt Telescope

Publications of the Astronomical Society of Japan

Dobashi, Kazuhito⁴  Nishiura, Shingo¹  Miyata, Takashi¹  Nakada, Yoshikazu¹  Ohnishi, Kouji³  Watanabe, Jun-ichi² 

[1] Kiso Observatory, Institute of Astronomy, The University of Tokyo, Mitake-mura, Kiso-gun, Nagano 397-0101;National Astronomical Observatory, Mitaka, Tokyo 181-8588;Nagano National College of Technology, 716, Tokuma, Nagano-city, Nagano 381-8550;Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501

关键词: "comets: individual (Comet 55P/Tempel–Tuttle)";    "meteorites;    meteors;    meteoroids";   

DOI  :  10.1093/pasj/54.6.L83

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WereportontheresultsofCCDimagingoftheradiantpointsofLeonidswiththe105cmKisoSchmidttelescopeduringitsstormin2001.Thecentercoordinatesoftheobservedfieldwere$$alpha(mathrm{J}2000.0)={10{}^{mathrm{h}}17{}^{mathrm{m}}02lap{.}{}^{mathrm{s}}4}$$and$$delta(mathrm{J}2000.0)=+{21{}^{mathrm{circ}}37{}^{mathrm{prime}}48lap{.}{}^{mathrm{primeprime}}0}$$,correspondingtothecenterpositionbetweenthetworadiantpointsoriginatingfromdusttrailscreatedbythe1699and1866returnsoftheComet55P/Tempel–Tuttle(McNaught,Asher2001;WGN,29,156).SixCCDimageshavingafieldofviewof$${51lap{.}{}^{mathrm{prime}}2}imes{51lap{.}{}^{mathrm{prime}}2}$$wereobtainedsuccessivelyfrom16h58 mto18h28 monNovember18(UT)inordertocoverthetwoexpectedpeaksofactivityofthedistinctradiantpoints.Alimitingsurfacebrightnessof$$25.93,mathrm{mag},mathrm{arcsec}^{-2}$$,i.e.,the$$1,sigma$$noiseleveloftheskybackground,wasachievedineachimage.Asaresult,wedetectedonlyonefaintLeonidmeteorwhichmostlikelyoriginatedfromadusttrailcreatedbythe1866return.Theintegratedtotalmagnitudeofthemeteoris$$m_{V}=18.34pm0.34,mathrm{mag}$$ontheimage.Assumingadurationtimeof0.1–1 s,weestimatethemagnitudeatthemaximumluminosityofthismeteortobe$$9.70pm1.59,mathrm{mag}$$.Thiscorrespondstoaphotometricmassof$$(2.65^{+13.5}_{-2.22})imes10^{-10},mathrm{kg}$$,whichmakesthismeteoroneofthefaintestandsmallestLeonidsdetectedsofar.

【 授权许可】

Unknown