5 results on '"Near-Earth objects (1092)"'
Search Results
2. ASTERIA — Thermal inertia evaluation of asteroid Didymos.
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Novaković, Bojan and Fenucci, Marco
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SMALL solar system bodies , *NEAR-earth asteroids , *NEAR-Earth objects , *DOUBLE Asteroid Redirection Test (U.S.) , *MICROSPACECRAFT - Abstract
Asteroid Didymos, recently targeted by the NASA DART mission, is also planned to be visited by the ESA Hera mission. The main goal of the DART mission was to impact Dimorphos, the small satellite of Didymos, which was accomplished in September 2022. This collision altered the Didymos–Dimorphos system, generating a notable quantity of ejecta that turned Dimorphos into an active asteroid, with some ejecta potentially settling on the surfaces of both components. This prompts the investigation into the extent of post-impact surface alterations on these bodies, compared to their original states. The purpose of this study is to independently evaluate the pre-impact thermal inertia of Didymos. We employed ASTERIA, an alternative to conventional thermophysical modeling, to estimate the surface thermal inertia of Didymos. The approach is based on a model-to-measurement comparison of the Yarkovsky effect-induced drift on the orbital semi-major axis. These results, alongside existing literature, enable an evaluation of the impact-induced alterations in Didymos's thermal inertia. Our nominal estimate with a constant thermal inertia model stands at Γ = 21 1 − 55 + 81 J m−2 K−1 s − 1 / 2 , while assuming it varies with the heliocentric distance with an exponent of − 0. 75 thermal inertia of Didymos is found to be 25 8 − 63 + 94 J m−2 K−1 s − 1 / 2. Subsequent verification confirmed that this result is robust against variations in unknown physical parameters. The thermal inertia estimates for Didymos align statistically with values reported in the literature, derived from both pre- and post-impact data. The forthcoming Hera mission will provide an opportunity to further corroborate these findings. Additionally, our results support the hypothesis that the thermal inertia of near-Earth asteroids is generally lower than previously expected. • We obtained an independent estimate of the pre-impact thermal inertia of the asteroid Didymos. • The results are statistically compatible with other literature values. • It indicates that any changes to Didymos' thermal inertia were either negligible or within the detection limits of the applied methodology. • The result adds to growing evidence for lower than expected thermal inertia of near-Earth asteroids. [ABSTRACT FROM AUTHOR]
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- 2024
- Full Text
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3. The dynamical origins of the dark comets and a proposed evolutionary track.
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Taylor, Aster G., Steckloff, Jordan K., Seligman, Darryl Z., Farnocchia, Davide, Dones, Luke, Vokrouhlický, David, Nesvorný, David, and Micheli, Marco
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NEAR-Earth objects , *STRENGTH of materials , *CELESTIAL mechanics , *RESONANCE - Abstract
So-called 'dark comets' are small, morphologically inactive near-Earth objects (NEOs) that exhibit nongravitational accelerations inconsistent with radiative effects. These objects exhibit short rotational periods (minutes to hours), where measured. We find that the strengths required to prevent catastrophic disintegration are consistent with those measured in cometary nuclei and expected in rubble pile objects. We hypothesize that these dark comets are the end result of a rotational fragmentation cascade, which is consistent with their measured physical properties. We calculate the predicted size-frequency distribution for objects evolving under this model. Using dynamical simulations, we further demonstrate that the majority of these bodies originated from the ν 6 resonance, implying the existence of volatiles in the current inner main belt. Moreover, one of the dark comets, (523599) 2003 RM, likely originated from the outer main belt, although a JFC origin is also plausible. These results provide strong evidence that volatiles from a reservoir in the inner main belt are present in the near-Earth environment. • The recently-defined "dark comets" may have two source populations. • A truncated rotational fragmentation cascade explains their observed properties. • This mechanism produces a unique and testable size-frequency distribution. • A significant fraction of near-Earth objects may originate from this pathway. • The material strengths of the dark comets are consistent with comets and asteroids. [ABSTRACT FROM AUTHOR]
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- 2024
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4. The ESA Hera Mission: Detailed Characterization of the DART Impact Outcome and of the Binary Asteroid (65803) Didymos
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Patrick Michel, Michael Küppers, Adriano Campo Bagatin, Benoit Carry, Sébastien Charnoz, Julia de Leon, Alan Fitzsimmons, Paulo Gordo, Simon F. Green, Alain Hérique, Martin Juzi, Özgür Karatekin, Tomas Kohout, Monica Lazzarin, Naomi Murdoch, Tatsuaki Okada, Ernesto Palomba, Petr Pravec, Colin Snodgrass, Paolo Tortora, Kleomenis Tsiganis, Stephan Ulamec, Jean-Baptiste Vincent, Kai Wünnemann, Yun Zhang, Sabina D. Raducan, Elisabetta Dotto, Nancy Chabot, Andy F. Cheng, Andy Rivkin, Olivier Barnouin, Carolyn Ernst, Angela Stickle, Derek C. Richardson, Cristina Thomas, Masahiko Arakawa, Hirdy Miyamoto, Akiko Nakamura, Seiji Sugita, Makoto Yoshikawa, Paul Abell, Erik Asphaug, Ronald-Louis Ballouz, William F. Bottke, Dante S. Lauretta, Kevin J. Walsh, Paolo Martino, Ian Carnelli, Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Astronomía y Astrofísica, Department of Geosciences and Geography, Geology and Geophysics, Department of Physics, Planetary-system research, Michel P., Kuppers M., Bagatin A.C., Carry B., Charnoz S., de Leon J., Fitzsimmons A., Gordo P., Green S.F., Herique A., Juzi M., Karatekin O., Kohout T., Lazzarin M., Murdoch N., Okada T., Palomba E., Pravec P., Snodgrass C., Tortora P., Tsiganis K., Ulamec S., Vincent J.-B., Wunnemann K., Zhang Y., Raducan S.D., Dotto E., Chabot N., Cheng A.F., Rivkin A., Barnouin O., Ernst C., Stickle A., Richardson D.C., Thomas C., Arakawa M., Miyamoto H., Nakamura A., Sugita S., Yoshikawa M., Abell P., Asphaug E., Ballouz R.-L., Bottke W.F., Lauretta D.S., Walsh K.J., Martino P., and Carnelli I.
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1171 Geosciences ,Asteroid surfaces ,Impact phenomena ,Impact phenomena (779) ,Mission ,Near-Earth objects ,114 Physical sciences ,Asteroid dynamic ,Autre ,Asteroid satellites ,Earth and Planetary Sciences (miscellaneous) ,Binary ,Near-Earth objects (1092) ,Near-Earth object ,520 Astronomy ,Asteroid dynamics ,Asteroid ,Astronomy and Astrophysics ,620 Engineering ,115 Astronomy, Space science ,Asteroid satellites (2207) ,Asteroid satellite ,Asteroid surfaces (2209) ,Geophysics ,Space and Planetary Science ,Asteroid dynamics (2210) ,Planetary defense - Abstract
Funding Information: To achieve these objectives, Milani is carrying two scientific payloads, the ASPECT visual and near-infrared (Vis-NIR) imaging spectrometer and the VISTA thermogravimeter aimed at collecting and characterizing volatiles and dust particles below 10 μm. Additionally, navigation payloads include a visible navigation camera and lidar. The Milani consortium is composed of entities and institutions from Italy, the Czech Republic, and Finland. The consortium Prime is Tyvak International, responsible for the whole program management and platform design, development, integration, testing, and final delivery to the customer. Politecnico di Torino is tasked with defining requirements and performing thermal, radiation, and debris analysis. Politecnico di Milano is responsible for mission analysis and GNC. Altec will support the Ground Segment architecture and interface definition. Centro Italiano per la Ricerca Aerospaziale (CIRA) is responsible for the execution of the vehicle environmental campaign. HULD contributes to developing the mission-specific software. VTT is the main payload (ASPECT hyperspectral imager) provider and is supported by the following entities dealing with ASPECT-related development: University of Helsinki (ASPECT calibration); Reaktor Space Lab (ASPECT Data Processing Unit development), Institute of Geology of the Czech Academy of Sciences (ASPECT scientific algorithms requirements and testing); and Brno University of Technology (ASPECT scientific algorithms development). INAF-IAPS is the secondary Payload (VISTA, dust detector) provider. Funding Information: The Mission PI is appointed by ESA and is the primary interface to ESA. The Hera SMB consists of the ESA Hera Project Scientist (ESA PS), the Mission PI, and the Hera Advisory Board, consisting of four mission advisors. The Mission PI chairs the HIT and is supported by the Hera Advisory Board. The tasks of the Hera SMB are 1. advising the Hera mission project team on all aspects related to the Hera mission objectives; 2. ensuring that the WGs’ activities cover the needs of the Hera mission; 3. providing recommendations to ESA concerning the membership in the HIT; and 4. implementing the Publication Policy. Funding Information: Hera is the ESA contribution to the AIDA collaboration. Hera, Juventas, Milani, and their instruments are developed under ESA contract supported by national agencies. This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 870377 (project NEO-MAPP), the CNRS through the MITI interdisciplinary programs, ASI, CNES, JAXA, the Academy of Finland project no. 335595, and was conducted with institutional support RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences. M.L., E.P., P.T .and E.D. are grateful to the Italian Space Agency (ASI) for financial support through Agreement No. 2022-8-HH.0 in the context of ESA’s Hera mission. We are grateful to the whole Hera team, including Working Group core members and other contributors for their continuous efforts and support. Their names can be found on the following website: https:// www.heramission.space/team. Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society. 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 of the crater made by the DART mission, as well as measurement of the momentum transfer efficiency resulting from DART’s impact. The data from the Hera spacecraft and its two CubeSats will also provide significant insights into asteroid science and the evolutionary history of our solar system. Hera will perform the first rendezvous with a binary asteroid and provide new measurements, such as radar sounding of an asteroid interior, which will allow models in planetary science to be tested. Hera will thus provide a crucial element in the global effort to avert future asteroid impacts at the same time as providing world-leading science.
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- 2022
5. Expected Investigation of the (65803) Didymos–Dimorphos System Using the RGB Spectrophotometry Data Set from the LICIACube Unit Key Explorer (LUKE) Wide-angle Camera
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Giovanni Poggiali, John R. Brucato, Pedro H. Hasselmann, Simone Ieva, Davide Perna, Maurizio Pajola, Alice Lucchetti, Jasinghege D. P. Deshapriya, Vincenzo Della Corte, Elena Mazzotta Epifani, Alessandro Rossi, Stavro L. Ivanovski, Angelo Zinzi, Andrea Meneghin, Marilena Amoroso, Simone Pirrotta, Gabriele Impresario, Elisabetta Dotto, Ivano Bertini, Andrea Capannolo, Gabriele Cremonese, Biagio Cotugno, Massimo Dall’Ora, Valerio Di Tana, Igor Gai, Michèle Lavagna, Federico Miglioretti, Dario Modenini, Pasquale Palumbo, Emanuele Simioni, Simone Simonetti, Paolo Tortora, Marco Zannoni, Giovanni Zanotti, Poggiali, Giovanni, Brucato, John R., Hasselmann, Pedro H., Ieva, Simone, Perna, Davide, Pajola, Maurizio, Lucchetti, Alice, Deshapriya, Jasinghege D. P., Della Corte, Vincenzo, Mazzotta Epifani, Elena, Rossi, Alessandro, Ivanovski, Stavro L., Zinzi, Angelo, Meneghin, Andrea, Amoroso, Marilena, Pirrotta, Simone, Impresario, Gabriele, Dotto, Elisabetta, Bertini, Ivano, Capannolo, Andrea, Cremonese, Gabriele, Cotugno, Biagio, Dall’Ora, Massimo, Di Tana, Valerio, Gai, Igor, Lavagna, Michèle, Miglioretti, Federico, Modenini, Dario, Palumbo, Pasquale, Simioni, Emanuele, Simonetti, Simone, Tortora, Paolo, Zannoni, Marco, and Zanotti, Giovanni
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Phase angle (1217) ,Geophysics ,Asteroids (72) ,RGB photometry (1397) ,Laboratory astrophysics (2004) ,Space and Planetary Science ,Earth and Planetary Sciences (miscellaneous) ,Multivariate analysis (1913) ,Astronomy and Astrophysics ,Near-Earth objects (1092) ,Near infrared astronomy (1093) - Abstract
The Light Italian Cubesat for Imaging of Asteroids (LICIACube) is part of the NASA Double Asteroid Redirection Test (DART), the first mission aiming to demonstrate the applicability of the kinetic impactor method for planetary defense. The mission was launched on 2021 November 24 to perform the impact experiment on Dimorphos, the small secondary of the binary asteroid (65803) Didymos. The 6U LICIACube, stored as a piggyback of the DART spacecraft, is the first Italian mission operating in deep space managed by the Italian Space Agency that will witness the effects of the DART impact on Dimorphos. On board LICIACube, there is a suite of cameras that will perform imaging of Didymos and Dimorphos to investigate the DART impact effects and study the binary system. Among them, the LICIACube Unit Key Explorer (LUKE), a wide-angle camera coupled to an RGB Bayer pattern filter, will be pivotal to constrain the surface composition and heterogeneity of the binary system due to differences in surface properties linked with possible space weathering effects and/or the presence of exogenous material. Multiband photometric analysis of LUKE data and laboratory experiments in support of data interpretation will provide new insights on the binary asteroid nature and evolution. Moreover, photometric phase curve analysis will reveal the scattering properties of the granular surface medium providing important constraints for the microphysical properties of the Didymos–Dimorphos system. In this work, we will present the state of the art of the LUKE scientific activities with an overview of the instrument setup, science operations, and expected results.
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- 2022
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