Petr Pravec, P. Scheirich, P. Kušnirák, L. Šarounová, S. Mottola, Gerhard Hahn, Peter Brown, G. Esquerdo, N. Kaiser, Z. Krzeminski, Donald P. Pray, Brian D. Warner, Alan W. Harris, M. C. Nolan, E. S. Howell, L. A. M. Benner, Jean‐Luc Margot, A. Galád, W. Holliday, Michael Hicks, Yu. N. Krugly, D. J. Tholen, Robert J. Whiteley, Franck Marchis, D. R. Degraff, A. D. Grauer, S. Larson, F. P. Velichko, W. R. Cooney, Robert D. Stephens, Jin Zhu, K. Kirsch, R. Dyvig, L. Snyder, V. Reddy, Sharon Arthur Moore, Š. Gajdoš, Jozef Világi, G. Masi, David Higgins, Gordon E. Funkhouser, Brent Knight, Stephen M. Slivan, R. Behrend, M. Grenon, G. Burki, R. Roy, C. Demeautis, D. Matter, N. Waelchli, Yves Revaz, A. Klotz, M. Rieugné, P. Thierry, V. Cotrez, L. Brunetto, G. Kober,
Photometric data on 17 binary near-Earth asteroids (15 of them are certain detections, two are probables) were analysed and characteristic properties of the near-Earth asteroid (NEA) binary population were inferred. We have found that binary systems with a secondary-to-primary mean diameter ratio Ds/Dp⩾0.18 concentrate among NEAs smaller than 2 km in diameter; the abundance of such binaries decreases significantly among larger NEAs. Secondaries show an upper size limit of Ds=0.5–1km. Systems with ...
Tópico(s): Geological and Geochemical Analysis
2005 - Elsevier BV | Icarus
Petr Pravec, Alan W. Harris, P. Scheirich, P. Kušnirák, L. Šarounová, C. W. Hergenrother, S. Mottola, M. D. Hicks, G. Masi, Yu. N. Krugly, V. G. Shevchenko, M. C. Nolan, E. S. Howell, M. Kaasalainen, A. Galád, Peter Brown, D.R. DeGraff, John V. Lambert, W. R. Cooney, S. Foglia,
We present both a review of earlier data and new results on non-principal axis rotators (tumblers) among asteroids. Among new tumblers found, the best data we have are for 2002 TD60, 2000 WL107, and (54789) 2001 MZ7—each of them shows a lightcurve with two frequencies (full terms with linear combinations of the two frequencies are present in the lightcurve). For 2002 TD60, we have constructed a physical model of the NPA rotation. Other recent objects which have been found to be likely tumblers based ...
Tópico(s): Stellar, planetary, and galactic studies
2004 - Elsevier BV | Icarus
Petr Pravec, P. Scheirich, David Vokrouhlický, Alan W. Harris, P. Kušnirák, K. Hornoch, Donald P. Pray, David Higgins, A. Galád, Jozef Világi, Š. Gajdoš, Leonard Kornoš, Julian Oey, Marek Husárik, W. R. Cooney, J. Gross, D. Terrell, Russell I. Durkee, J. Pollock, D. Reichart, K. Ivarsen, J. Haislip, A. Lacluyzé, Yu. N. Krugly, N. Gaftonyuk, Robert D. Stephens, R. Dyvig, V. Reddy, V. G. Chiorny, O. Văduvescu, Penélope Longa-Peña, A. Tudorica, B. Warner, G. Masi, James W. Brinsfield, R. Gonçalves, Peter Brown, Z. Krzeminski, O. Gerashchenko, V. G. Shevchenko, I. Molotov, Franck Marchis,
Our photometric observations of 18 main-belt binary systems in more than one apparition revealed a strikingly high number of 15 having positively re-observed mutual events in the return apparitions. Our simulations of the survey showed that it cannot be due to an observational selection effect and that the data strongly suggest that poles of mutual orbits between components of binary asteroids in the primary size range 3–8 km are not distributed randomly: The null hypothesis of an isotropic distribution ...
Tópico(s): Stellar, planetary, and galactic studies
2011 - Elsevier BV | Icarus
Petr Pravec, P. Scheirich, P. Kušnirák, K. Hornoch, A. Galád, Shantanu P. Naidu, Donald P. Pray, Jozef Világi, Š. Gajdoš, Leonard Kornoš, Yu. N. Krugly, W. R. Cooney, J. Gross, D. Terrell, N. M. Gaftonyuk, J. T. Pollock, Marek Husárik, V. G. Chiorny, Robert D. Stephens, Russell I. Durkee, V. Reddy, R. Dyvig, J. Vraštil, Jindřich Žižka, S. Mottola, S. Hellmich, Julian Oey, V. Benishek, A. Kryszczyńska, David Higgins, J. G. Ries, Franck Marchis, M. Baek, B. Macomber, R. Inasaridze, O. Kvaratskhelia, V. Ayvazian, V. Rumyantsev, G. Masi, F. Colas, J. Lecacheux, R. Montaigut, A. Leroy, Peter Brown, Z. Krzeminski, I. Molotov, D. Reichart, J. Haislip, A. Lacluyzé,
We collected data on rotations and elongations of 46 secondaries of binary and triple systems among near-Earth, Mars-crossing and small main belt asteroids. 24 were found or are strongly suspected to be synchronous (in 1:1 spin–orbit resonance), and the other 22, generally on more distant and/or eccentric orbits, were found or are suggested to have asynchronous rotations. For 18 of the synchronous secondaries, we constrained their librational angles, finding that their long axes pointed to within ...
Tópico(s): High-pressure geophysics and materials
2015 - Elsevier BV | Icarus
Petr Pravec, Petr Fatka, David Vokrouhlický, P. Scheirich, Josef Ďurech, Daniel J. Scheeres, P. Kušnirák, K. Hornoch, A. Galád, Donald P. Pray, Yu. N. Krugly, О. Бурхонов, Sh. A. Ehgamberdiev, J. Pollock, Nicholas Moskovitz, Audrey Thirouin, J. L. Ortiz, N. Morales, Marek Husárik, R. Inasaridze, Julian Oey, David Polishook, J. Hanuš, H. Kučáková, J. Vraštil, Jozef Világi, Š. Gajdoš, Leonard Kornoš, Peter Vereš, N. M. Gaftonyuk, T. Hromakina, A. V. Sergeyev, I. Slyusarev, V. Ayvazian, W. R. Cooney, J. Gross, D. Terrell, F. Colas, F. Vachier, Stephen M. Slivan, B. A. Skiff, Franck Marchis, K. E. Ergashev, Donghee Kim, Amadeo Aznar Macías, M. Serra‐Ricart, R. Behrend, R. Roy, F. Manzini, I. Molotov,
We studied 93 asteroid pairs. We estimated times elapsed since separation of pair members that are between 7*10^3 and a few 10^6 yr. We derived the rotation periods for all the primaries and a sample of secondaries. We derived the absolute magnitude differences of the asteroid pairs that provide their mass ratios. We refined their WISE geometric albedos and estimated their taxonomic classifications. For 17 pairs, we determined their pole positions. In 2 pairs where we obtained the spin poles for ...
Tópico(s): Stellar, planetary, and galactic studies
2019 - Elsevier BV | Icarus
J. Hanuš, Marco Delbò, David Vokrouhlický, Peter Pravec, Josh Emery, V. Alí-Lagoa, Bryce Bolin, Maxime Devogéle, R. Dyvig, A. Galád, Robert Jedicke, Leonard Kornoš, P. Kušnirák, J. Licandro, V. Reddy, Jean‐Pierre Rivet, Jozef Világi, B. Warner,
Context. The near-Earth asteroid (3200) Phaethon is an intriguing object: its perihelion is only at 0.14 au and is associated with the Geminid meteor stream. Aims. We aim to use all available disk-integrated optical data to derive reliable convex shape model of Phaethon. By interpreting the available spaceand ground-based thermal infrared data and Spitzer spectra using a thermophysical model, we also aim to further constrain its size, thermal inertia, and visible geometric albedo. Methods. We apply ...
Tópico(s): Astronomical and nuclear sciences
2016 - EDP Sciences | Astronomy and Astrophysics