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Nr. 25 Zeitschrift der Vereinigung der Sternfreunde e.V. / VdS VdS-Sternwarte Kirchheim ISSN 1615 - 0880 www.vds-astro.de I/ 2008 JOGP!BTUSPTIPQDPNtXXXBTUSPTIPQDPN 5FMt'BY &JõFTUSt)BNCVSH "TUSPBSU "TUSPOPNJL)BMQIB$$% "UMBTEFS.FTTJFS0CKFLUF %JF BLUVFMMTUF 7FSTJPO &JOF 4POEFSFOUXJDLMVOH GàS EJF $$%"TUSP &JOFHFMVOHFOF.JTDIVOHBVT#FPCBDIUVOHT EFTCFLBOOUFO#JMECF OPNJF%BT'JMUFS XFMDIFTBVTTDIMJFMJDIGàSEFO IJMGFVOE#JMECBOE%BTHSP[àHJHF'PSNBUVOE BSCFJUVOHTQSPHSBN OÊDIUMJDIFO&JOTBU[LPO[J EJF BVGXÊOEJHF PQUJTDIF (FTUBMUVOH NBDIFO NFT HJCU FT KFU[U NJU QJFSU JTU WFSGàHU àCFS EJF-FLUàSF[VFJOFNFDIUFO(FOVTT JOUFSFTTBOUFO OFVFO FJOF5SBOTNJTTJPO &JOF EFSBSUJH VNGBOHSFJDIF VOE WPMMTUÊOEJHF 'VOLUJPOFO .PEFS WPO CJT [V %BSTUFMMVOH [V EFO OF %BUFJGPSNBUF XJF EJF NJU .FTTJFS0CKFLUFO IBU FT CJTIFS JO %4-33"8 XFSEFO TDINBMCBOEJ EFVUTDIFS 4QSBDIF VOUFSTUàU[U #JMEFS HFSFO 'JMUFSO OPDI OJDIU HFHF LÚOOFOEVSDIBVUP OJDIU [V CFO %JF #FTDISFJ#FTDISFJ NBUJTDIF 4UFSOGFM FSSFJDIFO CVOH [V EFO EFSLFOOVOH EJSFLU JTU %JF )BMC 0CKFLUFO HMJFEFSO ÃCFSMBHFSU XFSEFO XBT EJF #JMEGFMESPUBUJPO XFSUTCSFJUF TJDI JO EJF WFSOBDIMÊTTJHCBSNBDIU"VDIEJF#FBSCFJUVOH JTU BVG EFO "CTDIOJUUF )JTUP)JTUP WPO 'BSCCJMEFSO XVSEF FSXFJUFSU #FTPOEFSFT %VOLFMTUSPN WPO HÊOHJHFO $$%,BNFSBT SJF "TUSPQIZTJL "VHFONFSL MJFHU BVG EFS &SLFOOVOH VOE BCHFTUJNNU%JFIPIF5SBOTNJTTJPOCFJ)BMQIB VOE #FPCBDI #FIBOEMVOH WPO 1JYFMGFIMFSO EFS "VGOBINF LPNCJOJFSU NJU EFS #MPDLVOH CJT JOT *OGSBSPU UVOH (MFJDIHàMUJH PC EBT *OUFSFTTF $IJQT FS[FVHFO PQUJNBMF ,POUSBTUF "VUPHVJEJOH JTU FIFSIJTUPSJTDI UIFPSFUJTDIPEFSQSBLUJTDIBVTFIFSIJTUPSJTDI UIFPSFUJTDIPEFSQSBLUJTDIBVT HFSJDIUFUJTU LPNNUKFEFSNJUEJFTFN#VDIBVG 6QEBUF JOEFS3FHFMNÚHMJDI Ƚ TFJOF,PTUFO 7PMMWFSTJPOȽ BCȽ Ƚ .BLJOHB3FGSBDUPS5FMFDPQF 1IPUPTIPQ"TUSPOPNZ 5IF/JHIU4LZ0CTFSWFS}T(VJEF 5IF4DIVQNBOO5FMFTDPQF %FS"VUPSBSCFJUFUTFJUGBTU+BISFONJU1IP %JFTFT IJMGSFJDIF8FSL 8FN EFS #BV FJOFT 4QJF4QJF UPTIPQ VNTFJOF"TUSPGPUPT[VCFBSCFJUFO%JF EJFOU EFS FSGPMHSFJ HFMUFMFTLPQFT[VMBOHXFJMJH EBCFJHFNBDIUFO&SGBISVOHFOIBUFSJOEJFTFN DIFO 7PSCFSFJUVOH JTU LBOOFTKBNBMNJUFJOFN TQF[JFMMBVGEJF#FEàSGOJTTFEFT"NBUFVSBTUSPTQF[JFMMBVGEJF#FEàSGOJTTFEFT"NBUFVSBTUSP FJOFS BCXFDITMVOHT 3FGSBLUPS WFSTVDIFO %BT OPNFO [VHFTDIOJUUF SFJDIFO %FFQ4LZ OFO #VDI HFTBNNFMU TBHUFO TJDI BVDI EJF "VUP"VUP /BDIU 4PSUJFSU OBDI %JF CFIBOEFMUFO 5IF SFO EFS CFJEFO /FVFSTDIFJ/FVFSTDIFJ 4UFSOCJMEFSO EFT NFO TJOE VOUFS BOEFBOEF OVOHFO*N 4PNNFS VOE 8JO SFN EJF UFDIOJTDIF FSTUFO8FSL UFSIJNNFMT mOEFO "VTTUBUUVOH 'BSCNB XJSE EFS OBHFNFOU )JTUP TJDI EFUBJMMJFSUF #BV WPO HSBNNF .BTLJF #FTDISFJCVOHFO EFS 1MBOVOH CJT [VN SVOHTUFDIOJLFO [V IVOEFSUFO v'JSTU -JHIUi BVTGàSIMJDI "EEJUJPO NFISFSFS (BMBYJFO /FCFMO 0õFOFO 4UFSO VOE CFTDISJFCFO VOE EVSDI #JMEFS ,PSSFLUVSWPO ,VHFMIBVGFO %FS 5FMFTLPQBOCMJDL KFEFT FJOF$%30.FSHÊO[U%BT 7JHOFUUJFSVOHFO 0CKFLUT JTU CFTDISJFCFO VOE NJU FJOFN )JO [XFJUF 8FSL CFTDIÊGUJHU 'BSCIBMPT %FGPSNBUJPOFO PEFS XFJTCF[àHMJDIEFSWFSXFOEFUFO0QUJLWFSTF TJDI NJU EFN #BV FJOFT àCFSCFMJDIUFUFO 4UFSOFO -3(# VOE WJFMFT IFO #ÊOEF NJU JOTHFTBNU 'PUPT 4DIVQNBOO3FGSBLUPST NFIS"VGEFSCFJHFGàHUFO%7%CFmOEFOTJDI ;FJDIOVOHFO 5BCFMMFOVOE4UFSOLBS .BLJOHB3FGSBDUPS5FMFDPQFȽ BMMFJN#VDICFTQSPDIFOFOVOEWFSXFOEFUFO UFO #FJTQJFMCJMEFS 5IF4DIVQNBOO5FMFTDPQFȽ Ƚ [VTBNNFOOVSȽ 5IF"SQ"UMBT "TUSPOPNJL6)$& BTUSPTIPQ 8FSIBUOPDIOJDIUWPOEFO"SQ(BMBYJFOHFMF %JFTF OFVF 7BSJBOUF %BTTFJU[XFJ+BIS[FIOUFOFSGPMHSFJDIF,PO[FQU TFO )BMUPO"SQIBUJOEFOFS+BISFOEFTMFU[ EFT 6)$'JMUFST JTU IBU JO[XJTDIFO WJFMF /BDIBINFS HFGVOEFO UFO+BISIVOEFSUT FJOF-JTUFCFTPOFJOF-JTUFCFTPO FJOF HàOTUJHF %FTIBMCBDIUFO4JFVOCFEJOHUEBSBVG EBTT4JF EFSFS (BMBYJFO &SHÊO[VOH VOTF BVGEFSFDIUFOBTUSPTIPQ4FJUFMBOEFO FSTUFMMU*OEJFTFS SFT "OHFCPUFT OFVFO "VTHBCF (FHFOàCFS EFT"UMBTFTTJOE EFN 1SPm BMMF0CKFLBMMF0CKFL 6)$'JMUFS UF EFT "SQ JTU EJF "UMBT NJU )BMCXFSUT 0SJHJOBMGPUPT CSFJUF FUXBT OFVFO HSÚFS EJF5SBOTNJTHSÚFS EJF5SBOTNJT #JMEFSO VOE TJPO FUXBT HFSJOHFS BVTGàISMJ UZQJTDI HFHFO DIFO "VG %BEVSDI MJFGFSU FS FUXBT XFOJHFS LPOUSBTUSFJ /VSFDIUNJUEFN#JOEFTUSJDI"VGEFOBTUSP/VSFDIUNJUEFN#JOEFTUSJDI"VGEFOBTUSP TVDIIJMGFO DIF#JMEFSBOHSÚFSFO'FSOSPISFO%VSDITFJOF TIPQ4FJUFOmOEFO4JF3F[FOTJPOFOBMMFSBOHFTIPQ4FJUFOmOEFO4JF3F[FOTJPOFOBMMFSBOHF WFSUSFUFO &JOF &JHFOTDIBGUFOLÚOOFOXJSEFO6)$&'JMUFSBMT CPUFOFO #àDIFS %BT #FTPOEFSF &JO FJHFOT 'VOEHSVCF BO "OSFHVOHFO GàS #FPC#FPC QSFJTXFSUF "MUFSOBUJWF GàS (FSÊUF CJT DN CFTDIÊGUJHUFS 3F[FOTFOU VOE )PCCZBTUSPOPN BDIUFSVOE'PUPHSBGFO ½õOVOHFNQGFIMFO OJNNUTJDIKFEFT#VDIFTLSJUJTDIBO OVSȽ BCȽ XXXBTUSPTIPQDPN EDITORIAL 1 Liebe Mitglieder, liebe Sternfreunde, vor Ihnen liegt die neue, 25. Ausgabe Auch die Internetseite der VdS-FG Dark unserer Mitgliederzeitschrift „VdS-Jour- Sky unter www.lichtverschmutzung.de nal für Astronomie“, die erstmals vor können wir Ihnen empfehlen. zehn Jahren, im Spätjahr 1997, erschien. Ab Seite 138 finden Sie einen kurzen Zu Beginn des Neuen Jahres wünschen wir Rückblick auf 10 Jahre VdS-Journal. allen Mitgliedern und Hobby-Astronomen ein gutes, erfolgreiches und interes- Zurück liegt auch der 5. Astronomietag, santes Astrojahr 2008 mit vielen klaren Unser Titelbild: der am 29. September unter Beteiligung Nächten und schönen astronomischen Aufnahme des Kometen 17P/Holmes von fast 20.000 Menschen bundesweit Beobachtungen. am 5. November 2007, rund drei stattfand. Auch die 28. VdS-Tagung Wochen nach seinem sensationellen und Mitgliederversammlung vom Herzlichst Helligkeitsausbruch. Das Titelbild 2. – 4. November in Stuttgart gehört der Ihr wurde von Michael Jäger, Wachau Vergangenheit an. Auf der Mitglieder- aufgenommen. Die Daten lauten: versammlung wurde ein neuer Vorstand Komet Holmes am 5.11., 19:10 Uhr UT, gewählt, mehr dazu lesen Sie in der Rubrik mit 8“ f/2,75 ASA-Astrograph, CCD „Nach Redaktionsschluss“. Otto Guthier Sigma 6303. L 4x10 min. Filter blau, RGB 6:10:10 min. Bildbearbeitung Dort finden Sie auch einen ersten Bericht PS: Denken Sie bitte an die Überweisung mit Maxim DL, PS Picture Windows, zu dem sensationellen Helligkeitsausbruch des Jahresbeitrages; die Rechnung liegt Larson-Sekanina-Filter. des periodischen Kometen 17P/Holmes, dieser Ausgabe bei. der in der Nacht vom 23. auf den 24. Oktober förmlich „explodierte“ und seine Helligkeit um 14 Größenklassen (Faktor 500.000) binnen kurzer Zeit steigerte. Dieses außergewöhnliche Ereignis war für die Redaktion Anlass, das vorgesehe Titelbild durch eine Kometenaufnahme von Michael Jäger zu ersetzen! Das Schwerpunktthema dieser Ausgabe befasst sich mit der VdS-Sternwarte Kirchheim. Dazu erreichten uns viele inte- ressante Beiträge, die wir den Mitgliedern vorstellen. Der VdS-Sternwarte gilt ebenso unse- re Unterstützung wie die von unserem VdS-Mitglied Roy Hengst aus Essen initiierte öffentliche Petition gegen Lichtverschmutzung. Lesen Sie dazu einen Aufruf auf Seite 34. VdS-Journal Nr. 25 2 I NHALT EDITORIAL 1 NACH REDAKTIONSSCHLUSS – 28. VdS-Tagung 4 – VdS-Medaille 2007 4 – Komet 17P/ Holmes mit Helligkeitsausbruch 5 SCHWERPUNKTTHEMA Planetarische Nebel – 30 Jahre Volkssternwarte Kirchheim – 15 Jahre VdS- Sternwarte 6 – 15 Jahre Kooperation mit der Volkssternwarte Komet 17P/Holmes Kirchheim e.V. 13 Seite 5 – Die VdS-Sternwarte Kirchheim – Eine kurze Zeitreise in die 90er Jahre 14 – Sternwarte Kirchheim – Schon lange eine Feriensternwarte 16 – Die „familiäre“ Sternwarte... 19 – Astrourlaube in Kirchheim (1): Die ersten Jahre 20 – Kometenbeobachtung in der Sternwarte Kirchheim 24 – Traumurlaub auf der VdS-Sternwarte in Kirchheim 27 – Veränderliche Sterne und noch viel mehr... 29 – Bericht über die Volkssternwarte Kirchheim 32 – Optimierung des großen Newton der Sternwarte 32 FACHGRUPPENBEITRÄGE VdS-Sternwarte Kirchheim Amateurteleskope/Selbstbau – Verbesserungen an einer EQ-5 34 Seite 6 ff – Selbstbau eines Handrohres zur Bestimmung der Himmelshelligkeit (Teil 1) 35 – Wechseladapter für okularseitige Komponenten 38 – Wie ein Fels in der Brandung 39 Astrofotografie – Neues aus der FG Astrofotografie 40 – Mein Einstieg in das Hobby der Astrofotografie 42 – Die Toomre-Sequenz – wenn Welten zusammenstoßen 46 – Mein Observatorium in Afrika (Teil 2) 48 – Die Farben der Sterne (Teil 1): Die Kugelsternhaufen M 92 und M 71 als Musterbeispiele 53 – „Mass Segregation“ in M 5-Anhäufung massereicher Sterne im Zentrum von Kugelsternhaufen 56 Astrofotografie – Farbkalibration einer CCD-Aufnahme mit Hilfe von Seite 42 G-Sternen (Teil 1) 57 Atmosphärische Erscheinungen – 9. „Light and Color in Nature“ Konferenz vom 25. bis 29. Juni 2007 in Bozemann, Montana, USA 61 CCD-Technik – Das Selbstbauprojekt Universal Timer 66 – Superschnelle Sterne mit der Videokamera erwischt 68 Computerastronomie – Multilayer-eine Software zur Berechnung dünner optischer Schichten (Teil II) 72 – Wie hell ist SN 2006jc? 75 Omega Centauri Deep-Sky – Neues aus der FG Deep Sky 76 Seite 49 – Die Umlaufbewegungen des Doppelsternes Xi Bootis – Doppelstern-Astrometrie mit der Webcam 76 – Astro auf La Palma: „Astropalma“ 69 – Buchprojekt „Wie sieht das Objekt im Fernrohr aus?“ – Auswertungsverfahren und Diskussion 81 Geschichte der Astronomie – Neues aus der FG Geschichte 84 – Vor 50 Jahren: Der erste künstliche Satellit im All 84 – Ein Deckenfresko aus dem 15. Jahrhundert als Himmelskarte 85 – Der Himmelsglobus der Marienbibliothek 87 – Prof. Ludwig Schupmann – Der Traum vom farbfehler- Sputnik 1 freien Linsenteleskop 89 Seite 84 VdS-Journal Nr. 25 I NHALT 3 Jugendarbeit – Erinnerungen an das ASL 91 – Mössbauerspektroskopie mit den Mars-Exploration- 92 Rovern – Dank VEGA von der Profi- zur Hobby-Astronomie 93 – Raumfahrt und Astronomie live in Berlin 94 Kleine Planeten – Mein Weg zur Astrometrie von
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    Yarkovsky effect detection and updated impact hazard assessment for Near-Earth Asteroid (410777) 2009 FD Alessio Del Vignaa,b, Javier Roac, Davide Farnocchiac, Marco Michelid,e, Dave Tholeni, Francesca Guerraa, Federica Spotof, Giovanni Battista Valsecchig,h aSpace Dynamics Services s.r.l., via Mario Giuntini, Navacchio di Cascina, Pisa, Italy bDipartimento di Matematica, Universit`adi Pisa, Largo Bruno Pontecorvo 5, Pisa, Italy cJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109 CA, USA dESA NEO Coordination Centre, Largo Galileo Galilei, 1, 00044 Frascati (RM), Italy eINAF - Osservatorio Astronomico di Roma, Via Frascati, 33, 00040 Monte Porzio Catone (RM), Italy fUniversit´eC^oted'Azur, Observatoire de la C^oted'Azur, CNRS, Laboratoire Lagrange, Boulevard de l'Observatoire, Nice, France gIAPS-INAF, via Fosso del Cavaliere 100, 00133 Roma, Italy hIFAC-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy iInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA Abstract Near-Earth Asteroid (410777) 2009 FD is a potentially hazardous asteroid with possible (though unlikely) impacts on Earth at the end of the 22nd century. The astrometry collected during the 2019 apparition provides information on the trajectory of (410777) by constraining the Yarkovsky effect, which is the main source of uncertainty for future predictions, and informing the impact hazard assessment. We included the Yarkovsky effect in the force model and estimated its magnitude from the fit to the (410777) optical and radar astrometric data. We performed the (410777) hazard assessment over 200 years by using two independent approaches: the NEODyS group adopted a generalisation of the Line Of Variations method in a 7-dimensional space, whereas the JPL team resorted to the Multilayer Clustered Sampling technique.
  • Arxiv:2007.05011V2 [Astro-Ph.GA] 17 Aug 2020 Laboration Et Al

    Arxiv:2007.05011V2 [Astro-Ph.GA] 17 Aug 2020 Laboration Et Al

    Draft version August 19, 2020 Typeset using LATEX twocolumn style in AASTeX63 Revised and new proper motions for confirmed and candidate Milky Way dwarf galaxies Alan W. McConnachie1 and Kim A. Venn2 1NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, B.C., Canada, V9E 2E7 2Physics & Astronomy Department, University of Victoria, 3800 Finnerty Rd, Victoria, B.C., Canada, V8P 5C2 ABSTRACT A new derivation of systemic proper motions of Milky Way satellites is presented, and applied to 59 confirmed or candidate dwarf galaxy satellites using Gaia Data Release 2. This constitutes all known Milky Way dwarf galaxies (and likely candidates) as of May 2020 except the Magellanic Clouds, the Canis Major and Hydra 1 stellar overdensities, and the tidally disrupting Bootes III and Sagittarius dwarf galaxies. We derive systemic proper motions for the first time for Indus 1, DES J0225+0304, Cetus 2, Pictor 2 and Leo T, but note that the latter three rely on photometry that is of poorer quality than for the rest of the sample. We cannot resolve a signal for Bootes 4, Cetus 3, Indus 2, Pegasus 3, or Virgo 1. Our method is inspired by the maximum likelihood approach of Pace & Li(2019) and examines simultaneously the spatial, color-magnitude, and proper motion distribution of sources. Systemic proper motions are derived without the need to identify confirmed radial velocity members, although the proper motions of these stars, where available, are incorporated into the analysis through a prior on the model. The associated uncertainties on the systemic proper motions are on average a factor of ∼ 1:4 smaller than existing literature values.
  • Orion® Intelliscope® Computerized Object Locator

    Orion® Intelliscope® Computerized Object Locator

    INSTRUCTION MANUAL Orion® IntelliScope® Computerized Object Locator #7880 Providing Exceptional Consumer Optical Products Since 1975 Customer Support (800) 676-1343 E-mail: [email protected] Corporate Offices (831) 763-7000 89 Hangar Way, Watsonville, CA 95076 IN 229 Rev. G 01/09 Congratulations on your purchase of the Orion IntelliScope™ Com­ pu ter ized Object Locator. When used with any of the SkyQuest IntelliScope XT Dobsonians, the object locator (controller) will provide quick, easy access to thousands of celestial objects for viewing with your telescope. Coil cable jack The controller’s user-friendly keypad combined with its database of more than 14,000 RS-232 jack celestial objects put the night sky literally at your fingertips. You just select an object to view, press Enter, then move the telescope manually following the guide arrows on the liquid crystal display (LCD) screen. In seconds, the IntelliScope’s high-resolution, 9,216- step digital encoders pinpoint the object, placing it smack-dab in the telescope’s field of Backlit liquid-crystal display view! Easy! Compared to motor-dependent computerized telescopes systems, IntelliScope is faster, quieter, easier, and more power efficient. And IntelliScope Dobs eschew the complex initialization, data entry, or “drive training” procedures required by most other computer- ized telescopes. Instead, the IntelliScope setup involves simply pointing the scope to two bright stars and pressing the Enter key. That’s it — then you’re ready for action! These instructions will help you set up and properly operate your Intelli Scope Com pu ter- ized Object Locator. Please read them thoroughly. Table of Contents 1.
  • Neutron Star Powered Nebulae: a New View on Pulsar Wind Nebulae with the Fermi Gamma-Ray Space Telescope

    Neutron Star Powered Nebulae: a New View on Pulsar Wind Nebulae with the Fermi Gamma-Ray Space Telescope

    NEUTRON STAR POWERED NEBULAE: A NEW VIEW ON PULSAR WIND NEBULAE WITH THE FERMI GAMMA-RAY SPACE TELESCOPE A DISSERTATION SUBMITTED TO THE DEPARTMENT OF PHYSICS AND THE COMMITTEE ON GRADUATE STUDIES OF STANFORD UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY arXiv:1401.6718v1 [astro-ph.HE] 27 Jan 2014 Joshua Jeremy Lande August 2013 c Copyright by Joshua Jeremy Lande 2018 All Rights Reserved ii I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. (Stefan Funk) Principal Adviser I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. (Elliott Bloom) I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy. (Roger Romani) Approved for the University Committee on Graduate Studies iii \Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me." { Immanuel Kant iv Abstract Pulsars are rapidly-rotating neutron stars born out of the death of stars. A diffuse nebula is formed when particles stream from these neutron stars and interact with the ambient medium. These pulsar wind nebulae (PWNe) are visible across the electro- magnetic spectrum, producing some of the most brilliant objects ever observed.
  • (99942) Apophis

    (99942) Apophis

    Asteroid (99942) Apophis: new predictions of Earth encounters for this potentially hazardous asteroid David Bancelin, François Colas, William Thuillot, Daniel Hestroffer, Marcelo Assafin To cite this version: David Bancelin, François Colas, William Thuillot, Daniel Hestroffer, Marcelo Assafin. Asteroid (99942) Apophis: new predictions of Earth encounters for this potentially hazardous asteroid. Astron- omy and Astrophysics - A&A, EDP Sciences, 2012, 544, pp.id. A15. 10.1051/0004-6361/201117981. hal-00764893 HAL Id: hal-00764893 https://hal.archives-ouvertes.fr/hal-00764893 Submitted on 13 Dec 2012 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. A&A 544, A15 (2012) Astronomy DOI: 10.1051/0004-6361/201117981 & c ESO 2012 Astrophysics Asteroid (99942) Apophis: new predictions of Earth encounters for this potentially hazardous asteroid⋆ D. Bancelin1,F.Colas1, W. Thuillot1, D. Hestroffer1, and M. Assafin2,1,⋆⋆ 1 IMCCE, Observatoire de Paris, UPMC, CNRS UMR8028, 77 Av. Denfert-Rochereau, 75014 Paris, France e-mail: [david.bancelin;thuillot;colas;hestro]@imcce.fr 2 Universidade Federal do Rio de Janeiro, Observatorio do Valongo, Ladeira Pedro Antonio 43, CEP 20.080 – 090 Rio De Janeiro RJ, Brazil e-mail: [email protected] Received 30 August 2011 / Accepted 13 June 2012 ABSTRACT Context.