7 results on '"Bacci, Paolo"'
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2. Spin Change of Asteroid 2012 TC4 probably by Radiation Torques
- Author
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Lee, Hee-Jae, Ďurech, Josef, Vokrouhlický, David, Pravec, Petr, Moon, Hong-Kyu, Ryan, William, Kim, Myung-Jin, Kim, Chun-Hwey, Choi, Young-Jun, Bacci, Paolo, Pollock, Joe, and Apitzsch, Rolf
- Subjects
Astrophysics - Earth and Planetary Astrophysics - Abstract
Asteroid 2012 TC4 is a small ($\sim$10 m) near-Earth object that was observed during its Earth close approaches in 2012 and 2017. Earlier analyses of light curves revealed its excited rotation state. We collected all available photometric data from the two apparitions to reconstruct its rotation state and convex shape model. We show that light curves from 2012 and 2017 cannot be fitted with a single set of model parameters -- the rotation and precession periods are significantly different for these two data sets and they must have changed between or during the two apparitions. Nevertheless, we could fit all light curves with a dynamically self-consistent model assuming that the spin states of 2012 TC4 in 2012 and 2017 were different. To interpret our results, we developed a numerical model of its spin evolution in which we included two potentially relevant perturbations: (i) gravitational torque due to the Sun and Earth, and (ii) radiation torque known as the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect. Despite our model simplicity, we found that the role of gravitational torques is negligible. Instead, we argue that the observed change of its spin state may be plausibly explained as a result of the YORP torque. To strengthen this interpretation we verify that (i) the internal energy dissipation due to material inelasticity, and (ii) an impact with a sufficiently large interplanetary particle are both highly unlikely causes its observed spin state change. If true, this is the first case when the YORP effect has been detected for a tumbling body., Comment: 29 pages, 17 figures, Accepted for publication in AJ
- Published
- 2020
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3. The Second International Asteroid Warning Network Timing Campaign: 2005 LW3
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Farnocchia, Davide, Reddy, Vishnu, Bauer, James M., Warner, Elizabeth M., Micheli, Marco, Payne, Matthew J., Farnham, Tony, Kelley, Michael S., Alarcon, Miguel R., Bacci, Paolo, Bacci, Roberto, Bachini, Mauro, Baillie, Kevin, Baj, Giorgio, Bamberger, Daniel, Barkov, Anatoly P., Beck, Stefan, Betti, Guido, Biancalani, Enrico, Bolin, Bryce T., Briggs, David, Buzzi, Luca, Cheng, Haowen, Christensen, Eric, Coffano, Alessandro, Conversi, Luca, Demeautis, Christophe, Denneau, Larry, Desmars, Josselin, Djupvik, Anlaug A., Elenin, Leonid, Fini, Paolo, Felber, Tobias, Flynn, Randy, Galli, Gianni, Granvik, Mikael, Gray, Bill, Gray, Zuri, Grazzini, Luca, Hasubick, Werner, Hoffmann, Tobias, Holmes, Robert, Iozzi, Marco, Ivanov, Alexander L., Ivanov, Viktor A., Ivanova, Natalya V., Jacques, Cristóvão, Jiang, Hai, Zheng, Jinghui, Kasikov, Anni, Kim, Myung-Jin, Kumar, Balaji, Lee, Hee-Jae, Li, Bin, Liu, Jing, Licandro, Javier, Linder, Tyler, Lysenkov, Vadim E., Maestripieri, Martina, Mantero, Andrea, Marinello, Vladimiro, McCormick, Jennie, Moon, Darrel, Nastasi, Alessandro, Neill, James D., Neue, Guenther, Novichonok, Artem O., Ocaña, Francisco, Pizzetti, Gianpaolo, Pomazan, Anton, Purdum, Josiah N., Ratinaud, Christophe, Roh, Dong-Goo, Romanov, Filipp D., Ruocco, Nello, Santana-Ros, Toni, Scarmato, Toni, Schmalz, Anastasia, Schmalz, Sergei, Serra-Ricart, Miquel, Sherrod, Clay, Sioulas, Nick, Soffiantini, Andrea, Succi, Giacomo, Tholen, David J., Thomsen, Jeppe S., Thuillot, William, Wainscoat, Richard, Wells, Guy, Weryk, Robert, Yakovenko, Nikolai A., Yim, Hong-Suh, Zhai, Chengxing, Farnocchia, Davide, Reddy, Vishnu, Bauer, James M., Warner, Elizabeth M., Micheli, Marco, Payne, Matthew J., Farnham, Tony, Kelley, Michael S., Alarcon, Miguel R., Bacci, Paolo, Bacci, Roberto, Bachini, Mauro, Baillie, Kevin, Baj, Giorgio, Bamberger, Daniel, Barkov, Anatoly P., Beck, Stefan, Betti, Guido, Biancalani, Enrico, Bolin, Bryce T., Briggs, David, Buzzi, Luca, Cheng, Haowen, Christensen, Eric, Coffano, Alessandro, Conversi, Luca, Demeautis, Christophe, Denneau, Larry, Desmars, Josselin, Djupvik, Anlaug A., Elenin, Leonid, Fini, Paolo, Felber, Tobias, Flynn, Randy, Galli, Gianni, Granvik, Mikael, Gray, Bill, Gray, Zuri, Grazzini, Luca, Hasubick, Werner, Hoffmann, Tobias, Holmes, Robert, Iozzi, Marco, Ivanov, Alexander L., Ivanov, Viktor A., Ivanova, Natalya V., Jacques, Cristóvão, Jiang, Hai, Zheng, Jinghui, Kasikov, Anni, Kim, Myung-Jin, Kumar, Balaji, Lee, Hee-Jae, Li, Bin, Liu, Jing, Licandro, Javier, Linder, Tyler, Lysenkov, Vadim E., Maestripieri, Martina, Mantero, Andrea, Marinello, Vladimiro, McCormick, Jennie, Moon, Darrel, Nastasi, Alessandro, Neill, James D., Neue, Guenther, Novichonok, Artem O., Ocaña, Francisco, Pizzetti, Gianpaolo, Pomazan, Anton, Purdum, Josiah N., Ratinaud, Christophe, Roh, Dong-Goo, Romanov, Filipp D., Ruocco, Nello, Santana-Ros, Toni, Scarmato, Toni, Schmalz, Anastasia, Schmalz, Sergei, Serra-Ricart, Miquel, Sherrod, Clay, Sioulas, Nick, Soffiantini, Andrea, Succi, Giacomo, Tholen, David J., Thomsen, Jeppe S., Thuillot, William, Wainscoat, Richard, Wells, Guy, Weryk, Robert, Yakovenko, Nikolai A., Yim, Hong-Suh, and Zhai, Chengxing
- Abstract
The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for a second observing campaign to test the timing accuracy of astrometric observation. With 82 participating stations, the International Asteroid Warning Network collected 1046 observations of 2005 LW3 around the time of the close approach. Compared to the previous timing campaign targeting 2019 XS, some individual observers were able to significantly improve the accuracy of their reported observation times. In particular, U.S. surveys achieved good timing performance. However, no broad, systematic improvement was achieved compared to the previous campaign, with an overall negative bias persisting among the different observers. The calibration of observing times and the mitigation of timing errors should be important future considerations for observers and orbit computers, respectively., Validerad;2023;Nivå 2;2023-12-12 (hanlid);For funding information see: https://doi.org/10.3847/PSJ/acfd22;Full text license: CC BY
- Published
- 2023
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4. Photometry and imaging of Comet 103P/Hartley in the 2010–2011 apparition
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Milani, Giannantonio, Bryssinck, Erik, Nicolini, Martino, Mikuž, Herman, Sostero, Giovanni, Bacci, Paolo, Borghini, Walter, Castellano, Dario, Facchini, Mauro, Favero, Giancarlo, Galli, Gianni, Guido, Ernesto, Hausler, Bernhard, Hornoch, Kamil, Howes, Nick, Ligustri, Rolando, Perrella, Carmen, Prosperi, Enrico, Skvarč, Jure, Srba, Jiří, Trabatti, Roberto, Vinante, Carlo, and Szabó, Gyula
- Published
- 2013
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5. Photometry and model of near-Earth asteroid 2021 DW1 from one apparition
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Kwiatkowski, Tomasz, primary, Koleńczuk, Paweł, additional, Oszkiewicz, Dagmara, additional, Troianskyi, Volodymyr, additional, Kryszczyńska, Agnieszka, additional, Kamiński, Krzysztof, additional, Kamińska, Monika, additional, Skiff, Brian A., additional, Moskovitz, Nicholas A., additional, Kashuba, Volodymyr, additional, Kim, Myung-Jin, additional, Mottola, Stefano, additional, Santana-Ros, Toni, additional, Kluwak, Tomasz, additional, Buzzi, Luca, additional, Bacci, Paolo, additional, Birtwhistle, Peter, additional, Miles, Richard, additional, and Chatelain, Joey, additional
- Published
- 2021
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6. Spin Change of Asteroid 2012 TC4 Probably by Radiation Torques
- Author
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Lee, Hee-Jae, primary, Ďurech, Josef, additional, Vokrouhlický, David, additional, Pravec, Petr, additional, Moon, Hong-Kyu, additional, Ryan, William, additional, Kim, Myung-Jin, additional, Kim, Chun-Hwey, additional, Choi, Young-Jun, additional, Bacci, Paolo, additional, Pollock, Joe, additional, and Apitzsch, Rolf, additional
- Published
- 2021
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7. 2012 QG42: A SLOW ROTATOR NEA.
- Author
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Warner BD, Baker RE, Bartczak P, Marciniak A, Sobkowiak K, Hirsch R, Kaminski K, Bacci P, Franco L, Vorobjov T, and Holmes RE Jr
- Abstract
CCD photometric observations of the near-Earth asteroid 2012 QG42 were made by a collaboration of observers in the U.S. and Europe. The asteroid was found to be a slow rotator, having a synodic period of 24.22 ± 0.01 h based on a data set spanning nearly two weeks. The amplitude of the lightcurve was 1.18 ± 0.03 mag.
- Published
- 2013
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