Meteorite D'oro Award Presentation - 2006

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Slide1: 

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 Secinaro, 27 Agosto 2006

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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)

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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.

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L’osservatorio astronomico di Remanzacco (UD)

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

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La scoperta della frammentazione del nucleo “G”

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Frammento “G” 26 Febbraio 2006; E. Guido e G. Sostero

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26 Marzo 2006, E. Guido e G. Sostero Frammento “G” della cometa 73P/Schwassmann-Wachmann visibilmente sdoppiato

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Immagine di conferma di Luca Buzzi e Federica Luppi

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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      

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Lo studio dell’evoluzione fotometrica (outburst ricorrenti)

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

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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

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Legami tra outburst e frammentazioni

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14.0 Aprile 2006, Remanzacco

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14.3 Aprile 2006, NM Skies

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Evoluzione fotometrica di un tipico outburst della 73P/Schwassmann-Wachmann (frammento “B”)

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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

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