minor planets; asteroids: general; techniques: photometric
Abstract :
[en] Context. As evidenced by recent survey results, the majority of asteroids are slow rotators (spin periods longer than 12 h), but lack spin and shape models because of selection bias. This bias is skewing our overall understanding of the spins, shapes, and sizes of asteroids, as well as of their other properties. Also, diameter determinations for large (>60 km) and medium-sized asteroids (between 30 and 60 km) often vary by over 30% for multiple reasons. Aims: Our long-term project is focused on a few tens of slow rotators with periods of up to 60 h. We aim to obtain their full light curves and reconstruct their spins and shapes. We also precisely scale the models, typically with an accuracy of a few percent. Methods: We used wide sets of dense light curves for spin and shape reconstructions via light-curve inversion. Precisely scaling them with thermal data was not possible here because of poor infrared datasets: large bodies tend to saturate in WISE mission detectors. Therefore, we recently also launched a special campaign among stellar occultation observers, both in order to scale these models and to verify the shape solutions, often allowing us to break the mirror pole ambiguity. <BR /> Results: The presented scheme resulted in shape models for 16 slow rotators, most of them for the first time. Fitting them to chords from stellar occultation timings resolved previous inconsistencies in size determinations. For around half of the targets, this fitting also allowed us to identify a clearly preferred pole solution from the pair of two mirror pole solutions, thus removing the ambiguity inherent to light-curve inversion. We also address the influence of the uncertainty of the shape models on the derived diameters. Conclusions: Overall, our project has already provided reliable models for around 50 slow rotators. Such well-determined and scaled asteroid shapes will, for example, constitute a solid basis for precise density determinations when coupled with mass information. Spin and shape models in general continue to fill the gaps caused by various biases.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Marciniak, A.; Adam Mickiewicz University, Poznan, Poland
Ďurech, J.; Charles University, Astronomical Institute
Choukroun, A.; Adam Mickiewicz University, Poznan, Poland
Hanuš, J.; Charles University, Astronomical Institute
Ogłoza, W.; Pedagogical University of Krakow, Poland
Pál, A.; Konkoly Observatory, Konkoly Observatory, Eotvos Lorand University, Department of Astronomy
Monteiro, F.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Frappa, E.; EURASTER, 8 rue du Tonnelier, 46100, Faycelles, France
Beisker, W.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Pavlov, H.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Moore, J.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Adomavičienė, R.; Vilnius University, Institute for Theoretical Physics and Astronomy
Aikawa, R.; Japanese Occultation Information Network, Japan
Andersson, S.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Antonini, P.; University of Geneva, Astronomical Observatory
Argentin, Y.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Asai, A.; Japanese Occultation Information Network, Japan
Assoignon, P.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Barton, J.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Baruffetti, P.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Bath, K. L.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Behrend, R.; University of Geneva, Astronomical Observatory
Benedyktowicz, L.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Bernasconi, L.; Les Engarouines Observatory, 84570, Mallemort-du-Comtat, France
Biguet, G.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Billiani, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Błażewicz, D.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Boninsegna, R.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Borkowski, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Bosch, J.; Collonges Observatory, 90 allée des Résidences, 74160, Collonges, France
Brazill, S.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Bronikowska, M.; Adam Mickiewicz University, Poznan, Poland
Bruno, A.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Butkiewicz-Bąk, M.; Adam Mickiewicz University, Poznan, Poland
Caron, J.; University of Geneva, Astronomical Observatory
Casalnuovo, G.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Castellani, J. J.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Ceravolo, P.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Conjat, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Delincak, P.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Delpau, J.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Demeautis, C.; University of Geneva, Astronomical Observatory
Demirkol, A.; Nicolaus Copernicus University, Astronomical Institute
Dróżdż, M.; Pedagogical University of Krakow, Poland
Duffard, R.; Institute of Astrophysics of Andalusia
Durandet, C.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Eisfeldt, D.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Evangelista, M.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Fauvaud, S.; Observatoire du Bois de Bardon, 16110, Taponnat, France, Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Fauvaud, M.; Observatoire du Bois de Bardon, 16110, Taponnat, France, Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Ferrais, Marin ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) ; Arecibo Observatory
Filipek, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Fini, P.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Fukui, K.; Japanese Occultation Information Network, Japan
Gährken, B.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Geier, S.; Astrophysical Institute of the Canaries, -
George, T.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Goffin, B.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Golonka, J.; Nicolaus Copernicus University, Astronomical Institute
Goto, T.; Japanese Occultation Information Network, Japan
Grice, J.; Open University, Department of Physical Sciences
Guhl, K.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Halíř, K.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Hanna, W.; Trans-Tasman Occultation Alliance (TTOA), Wellington, PO Box 3181, New Zealand
Harman, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Hashimoto, A.; Japanese Occultation Information Network, Japan
Hasubick, W.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Higgins, D.; Hunters Hill Observatory, Australia
Higuchi, M.; Japanese Occultation Information Network, Japan
Hirose, T.; Japanese Occultation Information Network, Japan
Hirsch, R.; Adam Mickiewicz University, Poznan, Poland
Hofschulz, O.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Horaguchi, T.; Japanese Occultation Information Network, Japan
Horbowicz, J.; Adam Mickiewicz University, Poznan, Poland
Ida, M.; Japanese Occultation Information Network, Japan
Kouno, K.; Japanese Occultation Information Network, Japan
Kowald, E.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Krajewski, J.; Adam Mickiewicz University, Poznan, Poland
Krannich, G.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Kreutzer, A.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Kryszczyńska, A.; Adam Mickiewicz University, Poznan, Poland
Kubánek, J.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Kudak, V.; Uzhgorod National University, Ukraine
Kugel, F.; University of Geneva, Astronomical Observatory
Kukita, R.; Japanese Occultation Information Network, Japan
Kulczak, P.; Adam Mickiewicz University, Poznan, Poland
Lazzaro, D.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Licandro, J.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Livet, F.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Maley, P.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA, NASA Johnson Space Center Astronomical Society, Houston, TX, 77058, USA
Manago, N.; Japanese Occultation Information Network, Japan
Mánek, J.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Manna, A.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Matsushita, H.; Japanese Occultation Information Network, Japan
Meister, S.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Mesquita, W.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Messner, S.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Michelet, J.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Michimani, J.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Mieczkowska, I.; Adam Mickiewicz University, Poznan, Poland
Morales, N.; Institute of Astrophysics of Andalusia
Motyliński, M.; Nicolaus Copernicus University, Astronomical Institute
Murawiecka, M.; Adam Mickiewicz University, Poznan, Poland
Newman, J.; Trans-Tasman Occultation Alliance (TTOA), Wellington, PO Box 3181, New Zealand
Nikitin, V.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Nishimura, M.; Japanese Occultation Information Network, Japan
Oey, J.; Blue Mountains Observatory, 94 Rawson Parade, Leura, NSW 2780, Australia
Oszkiewicz, D.; Adam Mickiewicz University, Poznan, Poland
Owada, M.; Japanese Occultation Information Network, Japan
Pakštienė, E.; Vilnius University, Institute for Theoretical Physics and Astronomy
Pawłowski, M.; Adam Mickiewicz University, Poznan, Poland
Pereira, W.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Perig, V.; Uzhgorod National University, Ukraine
Perła, J.; Adam Mickiewicz University, Poznan, Poland
Pilcher, F.; Organ Mesa Observatory, 4438 Organ Mesa Loop, Las Cruces, NM, 88011, USA
Podlewska-Gaca, E.; Adam Mickiewicz University, Poznan, Poland
Polák, J.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Polakis, T.; Command Module Observatory, 121 W. Alameda Dr., Tempe, AZ, 85282, USA
Polińska, M.; Adam Mickiewicz University, Poznan, Poland
Popowicz, A.; Silesian University of Technology, Department of Electronics, Electrical Engineering and Microelectronics, Akademicka 16, 44-100, Gliwice, Poland
Richard, F.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Rives, J. J.; Association T60, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400, Toulouse, France
Rodrigues, T.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Rogiński, Ł.; Adam Mickiewicz University, Poznan, Poland
Rondón, E.; Observatorio Nacional, R. Gen. José Cristino 77, Säo Cristövão, 20921-400, Rio de Janeiro, RJ, Brazil
Rottenborn, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Schäfer, R.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Schnabel, C.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Schreurs, O.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Selva, A.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Simon, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Skiff, B.; Lowell Observatory, Arizona
Skrutskie, M.; University of Virginia, Department of Astronomy
Skrzypek, J.; Adam Mickiewicz University, Poznan, Poland
Sobkowiak, K.; Adam Mickiewicz University, Poznan, Poland
Sonbas, E.; Adiyaman University, Turkey
Sposetti, S.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Stuart, P.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Szyszka, K.; Nicolaus Copernicus University, Astronomical Institute
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Trela, P.; Adam Mickiewicz University, Poznan, Poland
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Urbanik, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Vaudescal, G.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
Venable, R.; International Occultation Timing Association (IOTA), PO Box 7152, WA, 98042, USA
Watanabe, Ha.; Japanese Occultation Information Network, Japan
Watanabe, Hi.; Japanese Occultation Information Network, Japan
Winiarski, M.; Pedagogical University of Krakow, Poland
Wróblewski, R.; Adam Mickiewicz University, Poznan, Poland
Yamamura, H.; Japanese Occultation Information Network, Japan
Yamashita, M.; Japanese Occultation Information Network, Japan
Yoshihara, H.; Japanese Occultation Information Network, Japan
Zawilski, M.; International Occultation Timing Association/European Section, Am Brombeerhag 13, 30459, Hannover, Germany
