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    Secinaro 27 Agosto 2006

    Studi di comete
    Il caso della 73P Schwassmann Wachmann
    di Ernesto Guido e Giovanni Sostero Associazione Friulana di Astronomia e Metereologia Remanzacco UD Progetto CARA Sezione Comete dell Unione Astrofili Italiani

    La cometa periodica 73P Schwassmann Wachmann attesa al perielio per il 6 Giugno 2006 era di estremo interesse per vari motivi tra cui nel passaggio del 1995 la cometa mostro un repentino aumento di splendore e la frammentazione del suo nucleo in almeno tre parti due di essi erano sopravvissuti anche al passaggio del 2001 la cometa sarebbe transitata molto vicino alla Terra poco prima del perielio buona risoluzione spaziale per i nostri telescopi

    Abbiamo aderito fin da subito al progetto CARA http cara uai it dell Unione Astrofili Italiani http www uai it osservando la cometa sia dal Friuli Osservatorio di Remanzacco sia dal New Mexico USA tramite un telescopio robotico

    L osservatorio astronomico di Remanzacco UD

    Treno di frammenti della 73P ripreso dagli autori immagine utilizzata dalla NASA per un suo comunicato stampa del 24 3 2006

    La scoperta della frammentazione del nucleo G

    Frammento G 26 Febbraio 2006 E Guido e G Sostero

    26 Marzo 2006 E Guido e G Sostero Frammento G della cometa 73P Schwassmann Wachmann visibilmente sdoppiato

    Immagine di conferma di Luca Buzzi e Federica Luppi

    Electronic Telegram No 464 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M S 18 Smithsonian Astrophysical Observatory Cambridge MA 02138 U S A IAUSUBS CFA HARVARD EDU or FAX 617 495 7231 subscriptions CBAT CFA HARVARD EDU science COMET 73P SCHWASSMANN WACHMANN Sostero and Guido report that their ten co added 60 s unfiltered CCD images taken on Mar 26 43 UT show a companion to component G located almost 6 in p a 260 from G and showing a small coma of diameter almost 9 and total mag 18 2 limiting mag close to 19 K Sarneczky University of Szeged reports that component G had a dumbbell shaped coma on Mar 20 1 with a separation between its two optocenters of 2 5 along p a 80 260 deg by Apr 1 1 the coma of G appeared as a 12 long bar the distance between the two optocenters then being 6 7 aligned in p a 73 253 deg S Garro Var France reports that his CCD images taken with a 27 9 cm Schmidt Cassegrain reflector show that component G appeared as a 6 long elongated nuclear condensation on Mar 22 23 but that images taken on Apr 1 2 and 2 3 show two components clearly separated by 8 in the direction of the tail L Buzzi Varese Italy reports that CCD images taken with a 0 60 m reflector shows that the new companion to component G was of mag about 18 10 from G in p a 240 deg and more diffuse than G but moving parallel to G on Apr 2 16 E J Christensen Lunar and Planetary Laboratory reports that images obtained with the Mt Lemmon 1 5 m reflector on Mar 25 show the inner coma of component G to be elongated measuring approximately 2 x 5 with the long axis oriented along p a 260 Christensen s 120 s images on Apr 2 4 in good seeing clearly show a second condensation within the tail of component G located approximately 8 toward p a 255 from G it is difficult to tell the true extent of the condensation due to its location within the tail but its appearance is more diffuse than the primary 2006 April 5 CBET 464 Daniel W E Green

    Lo studio dell evoluzione fotometrica outburst ricorrenti

    Esempio di come cambia il profilo fotometrico della chioma cometaria durante un outburst

    Electronic Telegram No 464 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M S 18 Smithsonian Astrophysical Observatory Cambridge MA 02138 U S A IAUSUBS CFA HARVARD EDU or FAX 617 495 7231 subscriptions CBAT CFA HARVARD EDU science COMET 73P SCHWASSMANN WACHMANN Component B has gone into outburst as indicated by the following total visual magnitude estimates cf IAUC 8685 Mar 20 89 UT 12 0 K Hornoch Lelekovice Czech Republic 35 cm reflector 28 07 12 1 J J Gonzalez Leon Spain 20 cm reflector 31 67 11 9 S Yoshida Ibaraki Japan 40 cm reflector Apr 2 02 11 7 M Reszelski Szamotuly Galowo Poland 41 cm reflector 2 85 10 7 Reszelski 2 86 11 1 Hornoch 3 15 10 8 J Bortle Stormville NY 41 cm reflector 3 16 10 8 Gonzalez coma diameter 3 4 15 10 6 A Amorim Florianopolis Brazil 18 cm reflector Bortle notes that component B appeared on Apr 3 15 as a bright sharp star like object with a very faint surrounding haze G Sostero and E Guido Remanzacco Italy report the following unfiltered CCD magnitudes and photometric apertures for component B obtained remotely with a 0 25 m reflector near Mayhill NM Mar 26 43 12 7 0 6 Apr 2 36 11 3 2 7 4 01 9 6 2 7 5 31 9 1 3 2 They add that the computed Af rho parameter cf IAUC 7342 showed a threefold increase from nearly 48 cm to nearly 150 cm between Mar 29 4 and Apr 2 4 F Manzini Sozzago Italy reports that his CCD observations show an increase in brightness of component B of at least 3 magnitudes between Apr 1 8 and 2 8 he adds that two bright jets in p a 90 deg during Apr 2 90 3 05 and 3 85 4 11 and in p a 305 during Apr 3 85 4 11 seem to be related to the ourburst 2006 April 5 CBET 464 Daniel W E Green

    Legami tra outburst e frammentazioni

    14 0 Aprile 2006 Remanzacco

    14 3 Aprile 2006 NM Skies

    Evoluzione fotometrica di un tipico outburst della 73P Schwassmann Wachmann frammento B

    Ringraziamenti
    alla giuria del concorso per l onore che ci e stato riservato al Comune ed alla cittadinanza di Secinaro la loro squisita ospitalita agli amici della Sezione Comete UAI ed in particolare a Giannantonio Milani e Marco Fulle per l aiuto e l incoraggiamento a Martino Nicolini e Roberto Trabatti CARA per aver messo a nostra disposizione i softwares adatti allo studio delle comete