Sabina D. Raducan, Martin Jutzi, A. F. Cheng, Yun Zhang, O. S. Barnouin, G. S. Collins, R. T. Daly, T. M. Davison, C. M. Ernst, T. L. Farnham, Fabio Ferrari, Masatoshi Hirabayashi, Kathryn M. Kumamoto, Patrick Michel, Naomi Murdoch, Ryota Nakano, M. Pajola, A. Rossi, Harrison F. Agrusa, Brent W. Barbee, Megan Bruck Syal, N. L. Chabot, E. Dotto, Eugene G. Fahnestock, P. H. Hasselmann, Isabel Herreros, Stavro Ivanovski, Jian‐Yang Li, Alice Lucchetti, R. Luther, Jens Ormö, Michael J. Owen, Petr Pravec, A. S. Rivkin, Colas Robin, Paul Sánchez, Filippo Tusberti, K. Wünnemann, A. Zinzi, E. Mazzotta Epifani, C. Manzoni, B. May,
On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to explore target surface material properties and structures, consistent with the observed momentum deflection efficiency, ejecta cone geometry, and ejected mass. Our simulation, which best matches observations, indicates that Dimorphos is weak, with a cohesive strength ...
Tópico(s): Geological and Geochemical Analysis
2024 - Nature Portfolio | Nature Astronomy
Shantanu P. Naidu, Steven R. Chesley, Nicholas Moskovitz, Cristina A. Thomas, Alex J. Meyer, Petr Pravec, P. Scheirich, Davide Farnocchia, Daniel J. Scheeres, M. Brozović, L. A. M. Benner, A. S. Rivkin, N. L. Chabot,
Abstract The Double Asteroid Redirection Test (DART) mission impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos, on 2022 September 26 UTC. We estimate the changes in the orbital and physical properties of the system due to the impact using ground-based photometric and radar observations, as well as DART camera observations. Under the assumption that Didymos is an oblate spheroid, we estimate that its equatorial and polar radii are 394 ± 11 m and 290 ± 16 m, respectively. We ...
Tópico(s): Geology and Paleoclimatology Research
2024 - Institute of Physics | The Planetary Science Journal
N. L. Chabot, A. S. Rivkin, A. F. Cheng, O. S. Barnouin, Eugene G. Fahnestock, D. C. Richardson, A. M. Stickle, Cristina A. Thomas, C. M. Ernst, R. T. Daly, E. Dotto, A. Zinzi, Steven R. Chesley, Nicholas Moskovitz, Brent W. Barbee, P. A. Abell, Harrison F. Agrusa, Michele T. Bannister, Joel Beccarelli, Dmitriy Bekker, Megan Bruck Syal, B. J. Buratti, Michael Busch, Adriano Campo Bagatín, Joseph Chatelain, Sidney Chocron, G. S. Collins, L. Conversi, T. M. Davison, Mallory E. DeCoster, J. D. P. Deshapriya, Siegfried Eggl, R. C. Espiritu, T. L. Farnham, Marin Ferrais, Fabio Ferrari, Dóra Föhring, Oscar Fuentes-Muñoz, Igor Gai, Carmine Giordano, D. A. Glenar, Edward Gomez, Dawn Graninger, Simon Green, Sarah Greenstreet, P. H. Hasselmann, Isabel Herreros, Masatoshi Hirabayashi, Marek Husárik, Simone Ieva, Stavro Ivanovski, Samuel L. Jackson, Emmanuël Jehin, Martin Jutzi, Özgür Karatekin, Matthew M. Knight, Ludmilla Kolokolova, Kathryn M. Kumamoto, M. Küppers, F. La Forgia, M. Lazzarin, Jian‐Yang Li, Tim Lister, Ramin Lolachi, Michael P. Lucas, Alice Lucchetti, R. Luther, Rahil Makadia, E. Mazzotta Epifani, Jay W. McMahon, Gianmario Merisio, Colby C. Merrill, Alex J. Meyer, Patrick Michel, M. Micheli, A. Migliorini, Kate Minker, Dario Modenini, F. Moreno, Naomi Murdoch, Brian P. Murphy, Shantanu P. Naidu, Hari Nair, Ryota Nakano, Cyrielle Opitom, Jens Ormö, J. Michael Owen, M. Pajola, E. E. Palmer, P. Palumbo, Paolo Panicucci, Laura M. Parro, Jason M. Pearl, Antti Penttilä, D. Perna, Elisabeta Petrescu, Petr Pravec, Sabina D. Raducan, K.T. Ramesh, Ryan Ridden-Harper, J. L. Rizos, A. Rossi, Nathan X. Roth, Agata Rożek, B. Rozitis, E. V. Ryan, W. H. Ryan, Paul Sánchez, T. Santana-Ros, Daniel J. Scheeres, P. Scheirich, Cem Berk Senel, C. Snodgrass, Stefania Soldini, D. Souami, Thomas S. Statler, R. A. Street, T. J. Stubbs, J. M. Sunshine, Nicole J. Tan, G. Tancredi, C. L. Tinsman, Paolo Tortora, Filippo Tusberti, James D. Walker, Dany Waller, K. Wünnemann, Marco Zannoni, Yun Zhang,
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and the mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, the DART spacecraft impacted Dimorphos, the secondary member of the Didymos near-Earth asteroid binary system, demonstrating an autonomously navigated kinetic impact into an asteroid with limited prior knowledge for planetary ...
Tópico(s): Space Satellite Systems and Control
2024 - Institute of Physics | The Planetary Science Journal
R. T. Daly, C. M. Ernst, O. S. Barnouin, R. W. Gaskell, Hari Nair, Harrison F. Agrusa, N. L. Chabot, A. F. Cheng, E. Dotto, E. Mazzotta Epifani, R. C. Espiritu, T. L. Farnham, E. E. Palmer, Petr Pravec, A. S. Rivkin, Dany Waller, A. Zinzi,
Abstract Dimorphos was the target of the Double Asteroid Redirection Test (DART) mission. This paper summarizes the properties of an updated shape model of Dimorphos, describes the differences between the updated shape model and an earlier version published by Daly, Ernst, Barnouin et al. (doi: 10.1038/s41586-023-05810-5 ), summarizes the data products associated with this model, and explains where the products can be accessed. The updated shape model benefited from improved methods of incorporating ...
Tópico(s): Geology and Paleoclimatology Research
2024 - Institute of Physics | The Planetary Science Journal
Cristina A. Thomas, Shantanu P. Naidu, P. Scheirich, Nicholas Moskovitz, Petr Pravec, Steven R. Chesley, A. S. Rivkin, D. J. Osip, Tim Lister, L. A. M. Benner, M. Brozović, C. Contreras, N. Morrell, Agata Rożek, P. Kušnirák, K. Hornoch, Declan Mages, Patrick Taylor, Andrew D. Seymour, C. Snodgrass, U. G. Jørgensen, M. Dominik, B. A. Skiff, Tom Polakis, Matthew M. Knight, T. L. Farnham, Jon D. Giorgini, Brian Rush, Julie Bellerose, P. Salas, William P. Armentrout, Galen Watts, Michael W. Busch, Joseph Chatelain, Edward Gomez, Sarah Greenstreet, Liz Phillips, M. Bonavita, M. Burgdorf, Elahe Khalouei, Penélope Longa-Peña, M. Rabus, Sedighe Sajadian, N. L. Chabot, A. F. Cheng, W. H. Ryan, E. V. Ryan, Carrie E. Holt, Harrison F. Agrusa,
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, the secondary of near-Earth binary asteroid (65803) Didymos, and changing the orbital period of Dimorphos. A change in orbital period of approximately 7 min was expected if the incident momentum from the DART spacecraft was directly transferred to the asteroid target in a perfectly inelastic collision 1 , but studies of the probable ...
Tópico(s): Geological and Geochemical Analysis
2023 - Nature Portfolio | Nature
P. Scheirich, Petr Pravec, Alex J. Meyer, Harrison F. Agrusa, D. C. Richardson, Steven R. Chesley, Shantanu P. Naidu, Cristina A. Thomas, Nicholas Moskovitz,
The NASA Double Asteroid Redirection Test (DART) spacecraft successfully impacted the Didymos-Dimorphos binary asteroid system on 2022 September 26 UTC. We provide an update to its pre-impact mutual orbit and estimate the post-impact physical and orbital parameters, derived using ground-based photometric observations taken from July 2022 to February 2023. We found that the total change of the orbital period was $-33.240 \pm 0.072$ min. (all uncertainties are 3$\sigma$). We obtained the eccentricity of ...
Tópico(s): Stellar, planetary, and galactic studies
2024 - Institute of Physics | The Planetary Science Journal
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
Petr Pravec, Petr Fatka, David Vokrouhlický, Daniel J. Scheeres, P. Kušnirák, K. Hornoch, A. Galád, J. Vraštil, Donald P. Pray, Yu. N. Krugly, N. M. Gaftonyuk, R. Inasaridze, V. Ayvazian, O. Kvaratskhelia, V. Zhuzhunadze, Marek Husárik, W. R. Cooney, J. Gross, D. Terrell, Jozef Világi, Leonard Kornoš, Š. Gajdoš, О. Бурхонов, Sh. A. Ehgamberdiev, Z. Donchev, G. Borisov, T. Bonev, V. Rumyantsev, I. Molotov,
Tópico(s): Stellar, planetary, and galactic studies
2017 - Elsevier BV | Icarus
Harrison F. Agrusa, Yun Zhang, D. C. Richardson, Petr Pravec, Matija Ćuk, Patrick Michel, Ronald‐Louis Ballouz, Seth A. Jacobson, Daniel J. Scheeres, K. J. Walsh, O. S. Barnouin, R. T. Daly, E. E. Palmer, M. Pajola, Alice Lucchetti, Filippo Tusberti, J. V. DeMartini, Fabio Ferrari, Alex J. Meyer, Sabina D. Raducan, Paul Sánchez,
Abstract We explore binary asteroid formation by spin-up and rotational disruption considering the NASA DART mission's encounter with the Didymos–Dimorphos binary, which was the first small binary visited by a spacecraft. Using a suite of N -body simulations, we follow the gravitational accumulation of a satellite from meter-sized particles following a mass-shedding event from a rapidly rotating primary. The satellite’s formation is chaotic, as it undergoes a series of collisions, mergers, and close ...
Tópico(s): Stellar, planetary, and galactic studies
2024 - Institute of Physics | The Planetary Science Journal
D. C. Richardson, Harrison F. Agrusa, Brent W. Barbee, Rachel H. Cueva, Fabio Ferrari, Seth A. Jacobson, Rahil Makadia, Alex J. Meyer, Patrick Michel, Ryota Nakano, Yun Zhang, P. A. Abell, Colby C. Merrill, Adriano Campo Bagatín, O. S. Barnouin, N. L. Chabot, A. F. Cheng, Steven R. Chesley, R. T. Daly, Siegfried Eggl, C. M. Ernst, Eugene G. Fahnestock, T. L. Farnham, Oscar Fuentes-Muñoz, Edoardo Gramigna, Douglas P. Hamilton, Masatoshi Hirabayashi, Martin Jutzi, Josh Lyzhoft, Riccardo Lasagni Manghi, Jay W. McMahon, F. Moreno, Naomi Murdoch, Shantanu P. Naidu, E. E. Palmer, Paolo Panicucci, L. Pou, Petr Pravec, Sabina D. Raducan, A. S. Rivkin, A. Rossi, Paul Sánchez, Daniel J. Scheeres, P. Scheirich, S. R. Schwartz, D. Souami, G. Tancredi, P. Tanga, Paolo Tortora, J. M. Trigo‐Rodríguez, K. Tsiganis, John Wimarsson, Marco Zannoni,
Abstract NASA’s Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test of kinetic impactor technology for deflecting a potentially hazardous object in space. The experiment resulted in a small change to the dynamical state of the Didymos system consistent with expectations and Level 1 mission requirements. In the preencounter paper, predictions were put forward regarding the pre- and postimpact ...
Tópico(s): Planetary Science and Exploration
2024 - Institute of Physics | The Planetary Science Journal
Petr Pravec, Alex J. Meyer, P. Scheirich, Daniel J. Scheeres, Conor J. Benson, Harrison F. Agrusa,
Dimorphos, the secondary member of the binary asteroid (65803) Didymos, was impacted by NASA's Double Asteroid Redirection Test (DART) spacecraft on September 26, 2022. Images taken with the DART's DRACO camera before the impact showed that Dimorphos's original shape was nearly rotationally symmetric, close to an oblate spheroid, and it was probably in a synchronous spin state. As such, it did not show a detectable secondary brightness variation before the DART impact in the integral light from the ...
Tópico(s): Astrophysics and Star Formation Studies
2024 - Elsevier BV | Icarus
Josef Ďurech, David Vokrouhlický, Petr Pravec, J. Hanuš, Davide Farnocchia, Yu. N. Krugly, R. Inasaridze, V. R. Ayvazian, Petr Fatka, V. G. Chiorny, N. Gaftonyuk, A. Galád, R. Groom, K. Hornoch, H. Kučáková, P. Kušnirák, M. Lehký, O. Kvaratskhelia, G. Masi, I. Molotov, Julian Oey, J. Pollock, V. G. Shevchenko, J. Vraštil, B. Warner,
The rotation states of small asteroids are affected by a net torque arising from an anisotropic sunlight reflection and thermal radiation from the asteroids' surfaces. On long timescales, this so-called YORP effect can change asteroid spin directions and their rotation periods. We analyzed lightcurves of four selected near-Earth asteroids with the aim of detecting secular changes in their rotation rates that are caused by YORP. We use the lightcurve inversion method to model the observed lightcurves ...
Tópico(s): Stellar, planetary, and galactic studies
2017 - EDP Sciences | Astronomy and Astrophysics
R. T. Daly, C. M. Ernst, O. S. Barnouin, N. L. Chabot, A. S. Rivkin, A. F. Cheng, Elena Adams, Harrison F. Agrusa, Elisabeth Abel, Amy L. Alford, Erik Asphaug, Justin A. Atchison, Andrew R. Badger, Paul Baki, Ronald‐Louis Ballouz, Dmitriy Bekker, Julie Bellerose, Shyam Bhaskaran, B. J. Buratti, Saverio Cambioni, Michelle H. Chen, Steven R. Chesley, George T.‐C. Chiu, G. S. Collins, Matthew Cox, Mallory E. DeCoster, Peter S. Ericksen, R. C. Espiritu, Alan S. Faber, T. L. Farnham, Fabio Ferrari, Zachary J. Fletcher, R. W. Gaskell, Dawn Graninger, Musad Haque, Patricia A. Harrington-Duff, Sarah Hefter, Isabel Herreros, Masatoshi Hirabayashi, Philip M. Huang, Syau-Yun W. Hsieh, Seth A. Jacobson, Stephen Jenkins, Mark Jensenius, Jeremy John, Martin Jutzi, T. Kohout, Timothy O. Krueger, Frank E. Laipert, Norberto R. Lopez, R. Luther, Alice Lucchetti, Declan Mages, S. Marchi, Anna C Martin, Maria E. McQuaide, Patrick Michel, Nicholas Moskovitz, Ian W. Murphy, Naomi Murdoch, Shantanu P. Naidu, Hari Nair, M. C. Nolan, Jens Ormö, M. Pajola, E. E. Palmer, J. Peachey, Petr Pravec, Sabina D. Raducan, K.T. Ramesh, Joshua Ramirez, E. Reynolds, Joshua E. Richman, Colas Robin, Luis M. Rodríguez, Lew Roufberg, Brian Rush, C. A. Sawyer, Daniel J. Scheeres, P. Scheirich, S. R. Schwartz, Matthew P. Shannon, Brett N. Shapiro, Caitlin E. Shearer, Evan J. Smith, Josh Steele, Jordan K. Steckloff, A. M. Stickle, J. M. Sunshine, Emil A. Superfin, Zahi Tarzi, Cristina A. Thomas, Justin Thomas, J. M. Trigo‐Rodríguez, B. Teresa Tropf, Andrew Vaughan, D. Velez, Dany Waller, D. WILSON, Kristin Wortman, Yun Zhang,
Abstract Although no known asteroid poses a threat to Earth for at least the next century, the catalogue of near-Earth asteroids is incomplete for objects whose impacts would produce regional devastation 1,2 . Several approaches have been proposed to potentially prevent an asteroid impact with Earth by deflecting or disrupting an asteroid 1–3 . A test of kinetic impact technology was identified as the highest-priority space mission related to asteroid mitigation 1 . NASA’s Double Asteroid Redirection ...
Tópico(s): Geological and Geochemical Analysis
2023 - Nature Portfolio | Nature
Alex J. Meyer, Harrison F. Agrusa, D. C. Richardson, R. T. Daly, Oscar Fuentes-Muñoz, Masatoshi Hirabayashi, Patrick Michel, Colby C. Merrill, Ryota Nakano, A. F. Cheng, Brent W. Barbee, O. S. Barnouin, Steven R. Chesley, C. M. Ernst, Ioannis Gkolias, Nicholas Moskovitz, Shantanu P. Naidu, Petr Pravec, P. Scheirich, Cristina A. Thomas, K. Tsiganis, Daniel J. Scheeres,
Abstract With the successful impact of the NASA Double Asteroid Redirection Test (DART) spacecraft in the Didymos–Dimorphos binary asteroid system, we provide an initial analysis of the post-impact perturbed binary asteroid dynamics. To compare our simulation results with observations, we introduce a set of “observable elements” calculated using only the physical separation of the binary asteroid, rather than traditional Keplerian elements. Using numerical methods that treat the fully spin–orbit-coupled ...
Tópico(s): Geology and Paleoclimatology Research
2023 - Institute of Physics | The Planetary Science Journal
Darryl Z. Seligman, Davide Farnocchia, M. Micheli, David Vokrouhlický, Aster G. Taylor, Steven R. Chesley, Jennifer B. Bergner, Peter Vereš, O. Hainaut, K. J. Meech, Maxime Devogéle, Petr Pravec, Rob Matson, Sam Deen, D. J. Tholen, R. Weryk, E. G. Rivera‐Valentín, Benjamin N. L. Sharkey,
Abstract We report statistically significant detections of nonradial, nongravitational accelerations based on astrometric data in the photometrically inactive objects 1998 KY 26 , 2005 VL 1 , 2016 NJ 33 , 2010 VL 65 , 2016 RH 120 , and 2010 RF 12 . The magnitudes of the nongravitational accelerations are greater than those typically induced by the Yarkovsky effect, and there is no radiation-based, nonradial effect that can be so large. Therefore, we hypothesize that the accelerations are driven by outgassing ...
Tópico(s): Astrophysics and Star Formation Studies
2023 - Institute of Physics | The Planetary Science Journal
Conor J. Benson, Daniel J. Scheeres, M. Brozović, Steven R. Chesley, Petr Pravec, P. Scheirich,
We explore the effects of the 2029 Earth encounter on asteroid (99942) Apophis' non-principal axis spin state, leveraging refined orbit, spin state, and inertia information provided by more recent optical and radar observations. Propagating the asteroids' coupled orbit and rigid body attitude dynamics through the flyby, we present the range of possible post-flyby spin states. These spin state distributions will be valuable for planning Apophis observation campaigns and spacecraft missions, most notably ...
Tópico(s): Stellar, planetary, and galactic studies
2022 - Elsevier BV | Icarus
Abstract We modeled photometric observations of mutual events (eclipses and occultations) between the components of the binary near-Earth asteroid (65803) Didymos, the target of the Double Asteroid Redirection Test (DART) space mission, which were taken from 2003 to 2021. We derived parameters of the modified Keplerian mutual orbit (allowing for a quadratic drift in the mean anomaly, which is presumably caused by an interplay between the BYORP effect and mutual tides, or by differential Yarkovsky force) ...
Tópico(s): Geology and Paleoclimatology Research
2022 - Institute of Physics | The Planetary Science Journal
Patrick Michel, M. Küppers, Adriano Campo Bagatín, B. Carry, S. Charnoz, J. de León, A. Fitzsimmons, Paulo Gordo, Simon Green, Alain Hérique, Martin Juzi, Özgür Karatekin, T. Kohout, M. Lazzarin, Naomi Murdoch, Tatsuaki Okada, E. Palomba, Petr Pravec, C. Snodgrass, Paolo Tortora, K. Tsiganis, Stephan Ulamec, Jean‐Baptiste Vincent, K. Wünnemann, Yun Zhang, Sabina D. Raducan, E. Dotto, N. L. Chabot, Andy Cheng, A. S. Rivkin, O. S. Barnouin, C. M. Ernst, A. M. Stickle, D. C. Richardson, Cristina A. Thomas, Masahiko Arakawa, Hideaki Miyamoto, A. Nakamura, Seiji Sugita, Makoto Yoshikawa, P. A. Abell, Erik Asphaug, Ronald‐Louis Ballouz, W. F. Bottke, D. S. Lauretta, K. J. Walsh, Paolo Di Martino, Ian Carnelli,
Abstract Hera is a planetary defense mission under development in the Space Safety and Security Program of the European Space Agency for launch in 2024 October. It will rendezvous in late 2026 December with the binary asteroid (65803) Didymos and in particular its moon, Dimorphos, which will be impacted by NASA’s DART spacecraft on 2022 September 26 as the first asteroid deflection test. The main goals of Hera are the detailed characterization of the physical properties of Didymos and Dimorphos and ...
Tópico(s): High-pressure geophysics and materials
2022 - Institute of Physics | The Planetary Science Journal
Petr Pravec, Cristina A. Thomas, A. S. Rivkin, P. Scheirich, Nicholas Moskovitz, Matthew M. Knight, C. Snodgrass, J. de León, J. Licandro, Marcel Popescu, Audrey Thirouin, Dóra Föhring, Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, E. S. Howell, S. F. Green, J. E. Thomas-Osip, Scott S. Sheppard, T. L. Farnham, E. Mazzotta Epifani, E. Dotto, Simone Ieva, M. Dall’Ora, Rosita Kokotanekova, B. Carry, D. Souami,
Abstract We performed photometric observations of the binary near-Earth asteroid (65803) Didymos in support of the Double Asteroid Redirection Test (DART) mission that will test the Kinetic Impactor technology for diverting dangerous asteroids. It will hit the Didymos secondary, called Dimorphos, on 2022 September 26. We observed Didymos with 11 telescopes with diameters from 3.5 to 10.4 m during four apparitions in 2015–2021, obtaining data with rms residuals from 0.006 to 0.030 mag. We analyzed ...
Tópico(s): Planetary Science and Exploration
2022 - Institute of Physics | The Planetary Science Journal
Alex J. Meyer, Ioannis Gkolias, Michalis Gaitanas, Harrison F. Agrusa, Daniel J. Scheeres, K. Tsiganis, Petr Pravec, L. A. M. Benner, Fabio Ferrari, Patrick Michel,
Abstract The Double Asteroid Redirection Test (DART) mission will be the first test of a kinetic impactor as a means of planetary defense. In late 2022, DART will collide with Dimorphos, the secondary in the Didymos binary asteroid system. The impact will cause a momentum transfer from the spacecraft to the binary asteroid, changing the orbit period of Dimorphos and forcing it to librate in its orbit. Owing to the coupled dynamics in binary asteroid systems, the orbit and libration state of Dimorphos ...
Tópico(s): High-pressure geophysics and materials
2021 - Institute of Physics | The Planetary Science Journal
P. Scheirich, Petr Pravec, P. Kušnirák, K. Hornoch, Jay W. McMahon, Daniel J. Scheeres, D. Čapek, Donald P. Pray, H. Kučáková, A. Galád, J. Vraštil, Yu. N. Krugly, Nicholas Moskovitz, Louis Avner, B. A. Skiff, R. S. McMillan, Jeffrey A. Larsen, Melissa J. Brucker, A. F. Tubbiolo, W. R. Cooney, J. Gross, D. Terrell, О. Бурхонов, K. E. Ergashev, Sh. A. Ehgamberdiev, Petr Fatka, Russell I. Durkee, Eva Lilly Schunova, R. Inasaridze, V. Ayvazian, G. V. Kapanadze, N. M. Gaftonyuk, Juan A. Sanchez, V. Reddy, L. McGraw, Michael S. P. Kelley, I. Molotov,
We obtained thorough photometric observations of two binary near-Earth asteroids (66391) Moshup = 1999 KW4 and (88710) 2001 SL9 taken from 2000 to 2019. We modeled the data and derived physical and dynamical properties of the binary systems. For (66391) 1999 KW4, we derived its mutual orbit's pole, semimajor axis and eccentricity that are in agreement with radar-derived values (Ostro et al., 2006. Science, 314, 1276–1280). However, we found that the data are inconsistent with a constant orbital period ...
Tópico(s): Geology and Paleoclimatology Research
2021 - Elsevier BV | Icarus
A. S. Rivkin, N. L. Chabot, A. M. Stickle, Cristina A. Thomas, D. C. Richardson, O. S. Barnouin, Eugene G. Fahnestock, C. M. Ernst, A. F. Cheng, Steven R. Chesley, Shantanu P. Naidu, Thomas S. Statler, Brent W. Barbee, Harrison F. Agrusa, Nicholas Moskovitz, R. T. Daly, Petr Pravec, P. Scheirich, E. Dotto, Vincenzo Della Corte, Patrick Michel, M. Küppers, Justin A. Atchison, Masatoshi Hirabayashi,
Abstract The Double Asteroid Redirection Test (DART) is a Planetary Defense mission, designed to demonstrate the kinetic impactor technique on (65803) Didymos I Dimorphos, the secondary of the (65803) Didymos system. DART has four level 1 requirements to meet in order to declare mission success: (1) impact Dimorphos between 2022 September 25 and October 2, (2) cause at least a 73 s change in its binary orbit period via the impact, (3) measure the change in binary period to an uncertainty of 7.3 s or less, ...
Tópico(s): Space Satellite Systems and Control
2021 - Institute of Physics | The Planetary Science Journal
Shantanu P. Naidu, L. A. M. Benner, M. Brozović, M. C. Nolan, S. J. Ostro, Jean‐Luc Margot, Jon D. Giorgini, Toshi Hirabayashi, Daniel J. Scheeres, Petr Pravec, P. Scheirich, C. Magri, J. S. Jao,
Near-Earth asteroid Didymos is a binary system and the target of the proposed Double Asteroid Redirection Test (DART) mission (Cheng et al., 2016), which is a planetary defense experiment. The DART spacecraft will impact the satellite, causing changes in the binary orbit that will be measured by Earth-based observers. We observed Didymos using the planetary radars at Arecibo (2380 MHz, 12.6 cm) and Goldstone (8560 MHz, 3.5 cm) in November 2003. Delay-Doppler radar imaging of the binary system provided ...
Tópico(s): Geology and Paleoclimatology Research
2020 - Elsevier BV | Icarus
Produção Nacional
Revisado por pares
F. L. Rommel, F. Braga-Ribas, J. Desmars, J. I. B. Camargo, J. L. Ortiz, B. Sicardy, R. Vieira-Martins, M. Assafin, P. Santos-Sanz, R. Duffárd, E. Fernández-Valenzuela, J. Lecacheux, B. E. Morgado, G. Benedetti-Rossi, A. R. Gomes-Júnior, C. L. Pereira, D. Herald, W. Hanna, J. Bradshaw, N. Morales, J. Brimacombe, A. Burtovoi, Tom Carruthers, Josiane Rodrigues de Barros, Michele Fiori, A. C. Gilmore, Dan Hooper, K. Hornoch, C. Jacques, T. Janik, S. Kerr, P. M. Kilmartin, Jan Maarten Winkel, G. Naletto, D. Nardiello, V. Nascimbeni, J. Newman, A. Ossola, András Pál, E. Pimentel, Petr Pravec, S. Sposetti, Ariel Stechina, R. Szakáts, Yuji Ueno, L. Zampieri, J. Broughton, J. B. Dunham, David Dunham, David Arellano Gault, Tsutomu Hayamizu, K. Hosoi, Emmanuël Jehin, Lynne Jones, K. Kitazaki, R. Komžík, A. Marciniak, A. Maury, H. Mikuž, P. Nosworthy, Joaquín Fabrega Polleri, S. Rahvar, Rafael Sfair, P. B. Siqueira, C. Snodgrass, P. Sogorb, H. Tomioka, J. Tregloan-Reed, O. C. Winter,
Trans-Neptunian objects (TNOs) and Centaurs are remnants of our planetary system formation, and their physical properties have invaluable information for evolutionary theories. Stellar occultation is a ground-based method for studying these small bodies and has presented exciting results. These observations can provide precise profiles of the involved body, allowing an accurate determination of its size and shape. The goal is to show that even single-chord detections of TNOs allow us to measure their ...
Tópico(s): Isotope Analysis in Ecology
2020 - EDP Sciences | Astronomy and Astrophysics
J. V. DeMartini, D. C. Richardson, O. S. Barnouin, N. C. Schmerr, J. B. Plescia, P. Scheirich, Petr Pravec,
Near-Earth Asteroid 99942 Apophis presents a unique opportunity to study the dynamics, bulk properties, and interior structure of a rubble-pile asteroid when it makes its close encounter with the Earth in 2029. In order to better understand the potential outcomes of a tidal encounter between Earth and Apophis, and to support a potential future mission to Apophis, we perform numerical simulations of the encounter. We represent Earth as a single rigid sphere and the target body as a cohesionless, ...
Tópico(s): Geomagnetism and Paleomagnetism Studies
2019 - Elsevier BV | Icarus
Masatoshi Hirabayashi, A. B. Davis, Eugene G. Fahnestock, D. C. Richardson, Patrick Michel, A. F. Cheng, A. S. Rivkin, Daniel J. Scheeres, Steven R. Chesley, Yang Yu, Shantanu P. Naidu, S. R. Schwartz, Lance A. M. Benner, Petr Pravec, A. M. Stickle, Martin Jutzi,
The Asteroid Impact & Deflection Assessment (AIDA) targets binary near-Earth asteroid (65803) Didymos. As part of this mission, the NASA-led Double Asteroid Redirection Test (DART) will make a kinetic impactor collide with the smaller secondary of Didymos to test kinetic impact asteroid deflection technology, while the ESA-led Hera mission will evaluate the efficiency of the deflection by conducting detailed on-site observations. Research has shown that the larger primary of Didymos is spinning close ...
Tópico(s): Geology and Paleoclimatology Research
2019 - Elsevier BV | Advances in Space Research
J. Hanuš, David Vokrouhlický, Marco Delbò, Davide Farnocchia, David Polishook, Petr Pravec, K. Hornoch, H. Kučáková, P. Kušnirák, Robert D. Stephens, B. Warner,
The recent close approach of the NEA (3200) Phaethon offered a rare opportunity to obtain high-quality observational data. We used the newly obtained optical light curves to improve the spin and shape model of Phaethon and to determine its surface physical properties derived by thermophysical modeling. We also used the available astrometric observations of Phaethon, including those obtained by the Arecibo radar and the Gaia spacecraft, to constrain the secular drift of the orbital semimajor axis. ...
Tópico(s): Stellar, planetary, and galactic studies
2018 - EDP Sciences | Astronomy and Astrophysics
Wesley C. Fraser, Petr Pravec, A. Fitzsimmons, Pedro Lacerda, Michele T. Bannister, C. Snodgrass, I. Smolic,
The discovery 1 of 1I/2017 U1 (1I/'Oumuamua) has provided the first glimpse of a planetesimal born in another planetary system. This interloper exhibits a variable colour within a range that is broadly consistent with local small bodies, such as the P- and D-type asteroids, Jupiter Trojans and dynamically excited Kuiper belt objects2–7. 1I/'Oumuamua appears unusually elongated in shape, with an axial ratio exceeding 5:1 (refs 1,4,5,8). Rotation period estimates are inconsistent and varied, with reported ...
Tópico(s): Atmospheric Ozone and Climate
2018 - Nature Portfolio | Nature Astronomy
A. F. Cheng, A. S. Rivkin, Patrick Michel, Justin A. Atchison, O. S. Barnouin, L. A. M. Benner, N. L. Chabot, C. M. Ernst, Eugene G. Fahnestock, M. Kueppers, Petr Pravec, Emma S. G. Rainey, D. C. Richardson, A. M. Stickle, Cristina A. Thomas,
The Asteroid Impact & Deflection Assessment (AIDA) mission is an international cooperation between NASA and ESA. NASA plans to provide the Double Asteroid Redirection Test (DART) mission which will perform a kinetic impactor experiment to demonstrate asteroid impact hazard mitigation. ESA proposes to provide the Hera mission which will rendezvous with the target to monitor the deflection, perform detailed characterizations, and measure the DART impact outcomes and momentum transfer efficiency. The primary ...
Tópico(s): High-pressure geophysics and materials
2018 - Elsevier BV | Planetary and Space Science
M. Brozović, L. A. M. Benner, Joseph G. McMichael, Jon D. Giorgini, Petr Pravec, P. Scheirich, C. Magri, Michael W. Busch, Joseph S. Jao, Clement G. Lee, L. G. Snedeker, Marc A. Silva, M. A. Slade, Б. Семенов, M. C. Nolan, Patrick Taylor, E. S. Howell, K. J. Lawrence,
We report radar observations of Apophis obtained during the 2012−2013 apparition. We observed Apophis on fourteen days at Goldstone (8560 MHz, 3.5 cm) and on five days at Arecibo (2380 MHz, 12.3 cm) between 2012 December 21 to 2013 March 16. Closest approach occurred on January 9 at a distance of 0.097 au. We obtained relatively weak echo power spectra and delay-Doppler images. The highest range resolution was achieved at Goldstone, 0.125 µs or ∼20 m/px. The data suggest that Apophis is an elongated, ...
Tópico(s): Geology and Paleoclimatology Research
2017 - Elsevier BV | Icarus