Interstellar Meteoroids in the Japanese tv Catalogue

Publications of the Astronomical Society of Japan

Hajduková, Mária¹ 

[1] Astronomical Institute of the Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, The Slovak Republic

关键词: hyperbolic;    "interplanetary medium";    "interstellar meteors";    "meteorites;    meteors;    meteoroids";    "meteor showers";    orbits;   

DOI  :  10.1093/pasj/63.3.481

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Thepresentworkisbasedonananalysisofthe14763precisedeterminedmeteororbitscollectedintheJapanesetvcatalogue(SonotaCo(2009)),withtheaimofdeterminingtherealproportionofinterstellarmeteorsinthisdatabase.Ifinterstellarmeteorsarepresentamongtheregisteredmeteororbits,thedistributionoftheexcessesoftheirheliocentricvelocitiesshouldcorrespondtothedistributionoftheradialvelocitiesofclosestars.Forthevelocity$$v_i$$$$=$$20kms$$^{-1}$$ofaninterstellarmeteor,withrespecttotheSun,weobtainaheliocentricvelocityof$$v_H$$$$=$$46.6kms$$^{-1}$$ofaninterstellarmeteorarrivingatEarth.Anyerrorinthedeterminationof$$v_H$$,especiallyneartheparaboliclimit,cancreateanartificialhyperbolicorbitthatdoesnotreallyexist.Theanalysisofthedatadidnotproduceanyconvincingargumentsinfavouroftheexistenceoftruehyperbolicmeteorsinthecatalogue.Itwasshownthatthevastmajorityofthe484hyperbolicorbitshasbeencausedbyanoverestimationoftheirvelocity,andapproximately50%ofthembelongtometeorshowers.Furthermore,thehyperbolicexcessesofthevelocitiesinallcasesareverylow,aboutoneorderlessthanthevelocitydistributionofneighbouringstarssuggest.Theupperlimitoftheproportionofpossibleinterstellarmeteorstointerplanetaryonesamongallinvestigatedmeteororbitsinthedatabaseis1.3$$imes$$10$$^{-3}$$.

【 授权许可】

Unknown