The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2

Detalhes bibliográficos
Autor(a) principal: Vara-Lubiano, M.
Data de Publicação: 2022
Outros Autores: Benedetti-Rossi, G. [UNESP], Santos-Sanz, P., Ortiz, J. L., Sicardy, B., Popescu, M., Morales, N., Rommel, F. L., Morgado, B., Pereira, C. L., Álvarez-Candal, A., Fernández-Valenzuela, E., Souami, D., Ilic, D., Vince, O., Bachev, R., Semkov, E., Nedelcu, D. A., Sonka, A., Hudin, L., Boaca, M., Inceu, V., Curelaru, L., Gherase, R., Turcu, V., Moldovan, D., Mircea, L., Predatu, M., Teodorescu, M., Stoian, L., Juravle, A., Braga-Ribas, F., Desmars, J., Duffard, R., Lecacheux, J., Camargo, J. I.B., Assafin, M., Vieira-Martins, R., Pribulla, T., Husárik, M., Sivanič, P., Pal, A., Szakats, R., Kiss, C., Alonso-Santiago, J., Frasca, A., Szabó, G. M., Derekas, A., Szigeti, L., Drozdz, M., Ogloza, W., Skvarč, J., Ciabattari, F., Delincak, P., Di Marcantonio, P., Iafrate, G., Coretti, I., Baldini, V., Baruffetti, P., Klös, O., Dumitrescu, V., Mikuž, H., Mohar, A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1051/0004-6361/202141842
http://hdl.handle.net/11449/240560
Resumo: Context. Stellar occultations have become one of the best techniques to gather information about the physical properties of trans-Neptunian objects (TNOs), which are critical objects for understanding the origin and evolution of our Solar System. Aims. The purpose of this work is to determine, with better accuracy, the physical characteristics of the TNO (84922) 2003 VS2 through the analysis of the multichord stellar occultation on 2019 October 22 and photometric data collected afterward. Methods. We predicted, observed, and analyzed the multichord stellar occultation of the Second Gaia Data Release (Gaia DR2) source 3449076721168026624 (mÏ = 14.1 mag) by the plutino object 2003 VS2 on 2019 October 22. We performed aperture photometry on the images collected and derived the times when the star disappeared and reappeared from the observing sites that reported a positive detection. We fit the extremities of such positive chords to an ellipse using a Monte Carlo method. We also carried out photometric observations to derive the rotational light curve amplitude and rotational phase of 2003 VS2 during the stellar occultation. Combining the results and assuming a triaxial shape, we derived the 3D shape of 2003 VS2. Results. Out of the 39 observatories involved in the observational campaign, 12 sites, located in Bulgaria (one), Romania (ten), and Serbia (one), reported a positive detection; this makes it one of the best observed stellar occultations by a TNO so far. Considering the rotational phase of 2003 VS2 during the stellar occultation and the rotational light curve amplitude derived (Am = 0.264 ± 0.017 mag), we obtained a mean area-equivalent diameter of DAeq = 545 ± 13 km and a geometric albedo of 0.134 ± 0.010. By combining the rotational light curve information with the stellar occultation results, we derived the best triaxial shape for 2003 VS2, which has semiaxes a = 339 ± 5 km, b = 235 ± 6 km, and c = 226 ± 8 km. The derived aspect angle of 2003 VS2 is θ = 59 ± 2 or its supplementary θ = 121 ± 2, depending on the north-pole position of the TNO. The spherical-volume equivalent diameter is DVeq = 524 ± 7 km. If we consider large albedo patches on its surface, the semi-major axis of the ellipsoid could be ∼ 10 km smaller. These results are compatible with the previous ones determined from the single-chord 2013 and four-chord 2014 stellar occultations and with the effective diameter and albedo derived from Herschel and Spitzer data. They provide evidence that 2003 VS2s 3D shape is not compatible with a homogeneous triaxial body in hydrostatic equilibrium, but it might be a differentiated body and/or might be sustaining some stress. No secondary features related to rings or material orbiting around 2003 VS2 were detected.
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spelling The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2Kuiper belt objects: individual: 2003 VS2Methods: observationalTechniques: photometricContext. Stellar occultations have become one of the best techniques to gather information about the physical properties of trans-Neptunian objects (TNOs), which are critical objects for understanding the origin and evolution of our Solar System. Aims. The purpose of this work is to determine, with better accuracy, the physical characteristics of the TNO (84922) 2003 VS2 through the analysis of the multichord stellar occultation on 2019 October 22 and photometric data collected afterward. Methods. We predicted, observed, and analyzed the multichord stellar occultation of the Second Gaia Data Release (Gaia DR2) source 3449076721168026624 (mÏ = 14.1 mag) by the plutino object 2003 VS2 on 2019 October 22. We performed aperture photometry on the images collected and derived the times when the star disappeared and reappeared from the observing sites that reported a positive detection. We fit the extremities of such positive chords to an ellipse using a Monte Carlo method. We also carried out photometric observations to derive the rotational light curve amplitude and rotational phase of 2003 VS2 during the stellar occultation. Combining the results and assuming a triaxial shape, we derived the 3D shape of 2003 VS2. Results. Out of the 39 observatories involved in the observational campaign, 12 sites, located in Bulgaria (one), Romania (ten), and Serbia (one), reported a positive detection; this makes it one of the best observed stellar occultations by a TNO so far. Considering the rotational phase of 2003 VS2 during the stellar occultation and the rotational light curve amplitude derived (Am = 0.264 ± 0.017 mag), we obtained a mean area-equivalent diameter of DAeq = 545 ± 13 km and a geometric albedo of 0.134 ± 0.010. By combining the rotational light curve information with the stellar occultation results, we derived the best triaxial shape for 2003 VS2, which has semiaxes a = 339 ± 5 km, b = 235 ± 6 km, and c = 226 ± 8 km. The derived aspect angle of 2003 VS2 is θ = 59 ± 2 or its supplementary θ = 121 ± 2, depending on the north-pole position of the TNO. The spherical-volume equivalent diameter is DVeq = 524 ± 7 km. If we consider large albedo patches on its surface, the semi-major axis of the ellipsoid could be ∼ 10 km smaller. These results are compatible with the previous ones determined from the single-chord 2013 and four-chord 2014 stellar occultations and with the effective diameter and albedo derived from Herschel and Spitzer data. They provide evidence that 2003 VS2s 3D shape is not compatible with a homogeneous triaxial body in hydrostatic equilibrium, but it might be a differentiated body and/or might be sustaining some stress. No secondary features related to rings or material orbiting around 2003 VS2 were detected.Instituto De Astrofísica De Andalucía Consejo Superior De Investigaciones Científicas, Glorieta de la Astronomía S/NLesia Observatoire De Paris Université Psl Sorbonne Université Université De Paris CnrsLaboratório Interinstitucional De E-Astronomia - LIneA & Inct Do E-Universo Bairro Imperial De São Cristóvão (RJ), Rua Gal. José Cristino 77Unesp - São Paulo State University Grupo De Dinámica Orbital E Planetologia, SPAstronomical Institute Of The Romanian Academy, 5 CuÂitul de ArgintInstituto De Astrofísica De Canarias (IAC), C/Vía Láctea s/n La LagunaObservatório Nacional/MCTI, (RJ)Florida Space Institute Ucf Partnership 1 Building, 12354 Research ParkwayNaXys University Of Namur, 8 Rempart de la ViergeDepartment Of Astronomy Faculty Of Mathematics University Of Belgrade, Studentski trg 16Hamburger Sternwarte Universität Hamburg, Gojenbergsweg 112Astronomical Observatory, Volgina 7Institute Of Astronomy And National Astronomical Observatory Bulgarian Academy Of SciencesROASTERR-1 ObservatoryStardust ObservatoryAstroclubul BucurestiStardreams ObservatoryRomanian Academy - Cluj-Napoca Branch Astronomical Observatory ClujUniversity Of CraiovaInstitutul De Stiinte Spatiale (ISS), Atomistilor 409, C.P.: 23 MagureleSocietatea Romana Pentru Astronomie Culturala (SRPAC)Federal University Of Technology - Paraná (UTFPR/DAFIS)Institut Polytechnique Des Sciences Avancées Ipsa, 63 boulevard de BrandebourgInstitut De Mécanique Céleste Et De Calcul Des Ephémérides Imcce Observatoire De Paris Psl Research University Cnrs Sorbonne Universités Upmc Univ Paris 06 Univ. Lille, 77 Av. Denfert-RochereauUniversidade Federal Do Rio De Janeiro Observatorio Do ValongoAstronomical Institute Of The Slovak Academy Of SciencesKonkoly Observatory Research Centre For Astronomy And Earth Sciences, Konkoly Thege Miklos ut 15-17Osservatorio Astrofísico Di Catania (OACt-INAF), Via S. Sofia 78Elte Eötvös Loránd University Gothard Astrophysical ObservatoryMTA-ELTE Exoplanet Research Group, Szent Imre h. u. 112Mt. Suhora Observatory Pedagogical University Of Cracow Limanowa CountyIsaac Newton Group Of Telescopes Santa Cruz De La PalmaOsservatorio Astronomico Di Monte Agliale, Via Cune MotronePDlink ObservatoryInaf - Osservatorio Astronomico Di Trieste, Via Tiepolo 11Gruppo Astrofili Massesi EaonInternational Occultation Timing Association - European Section (IOTA/ES)Ia Cu SteleCrni Vrh ObservatoryFaculty Of Mathematics And Physics University Of LjubljanaDark Sky Slovenia, Savlje 89Unesp - São Paulo State University Grupo De Dinámica Orbital E Planetologia, SPConsejo Superior De Investigaciones CientíficasCnrsBairro Imperial De São Cristóvão (RJ)Universidade Estadual Paulista (UNESP)Astronomical Institute Of The Romanian AcademyInstituto De Astrofísica De Canarias (IAC)Observatório Nacional/MCTIPartnership 1 BuildingUniversity Of NamurUniversity Of BelgradeUniversität HamburgAstronomical ObservatoryBulgarian Academy Of SciencesROASTERR-1 ObservatoryStardust ObservatoryAstroclubul BucurestiStardreams ObservatoryAstronomical Observatory ClujUniversity Of CraiovaInstitutul De Stiinte Spatiale (ISS)Societatea Romana Pentru Astronomie Culturala (SRPAC)Federal University Of Technology - Paraná (UTFPR/DAFIS)Institut Polytechnique Des Sciences Avancées IpsaUniv. LilleUniversidade Federal do Rio de Janeiro (UFRJ)Astronomical Institute Of The Slovak Academy Of SciencesResearch Centre For Astronomy And Earth SciencesOsservatorio Astrofísico Di Catania (OACt-INAF)Gothard Astrophysical ObservatoryMTA-ELTE Exoplanet Research GroupPedagogical University Of Cracow Limanowa CountySanta Cruz De La PalmaOsservatorio Astronomico Di Monte AglialePDlink ObservatoryInaf - Osservatorio Astronomico Di TriesteEaonInternational Occultation Timing Association - European Section (IOTA/ES)Ia Cu SteleCrni Vrh ObservatoryUniversity Of LjubljanaDark Sky SloveniaVara-Lubiano, M.Benedetti-Rossi, G. [UNESP]Santos-Sanz, P.Ortiz, J. L.Sicardy, B.Popescu, M.Morales, N.Rommel, F. L.Morgado, B.Pereira, C. L.Álvarez-Candal, A.Fernández-Valenzuela, E.Souami, D.Ilic, D.Vince, O.Bachev, R.Semkov, E.Nedelcu, D. A.Sonka, A.Hudin, L.Boaca, M.Inceu, V.Curelaru, L.Gherase, R.Turcu, V.Moldovan, D.Mircea, L.Predatu, M.Teodorescu, M.Stoian, L.Juravle, A.Braga-Ribas, F.Desmars, J.Duffard, R.Lecacheux, J.Camargo, J. I.B.Assafin, M.Vieira-Martins, R.Pribulla, T.Husárik, M.Sivanič, P.Pal, A.Szakats, R.Kiss, C.Alonso-Santiago, J.Frasca, A.Szabó, G. M.Derekas, A.Szigeti, L.Drozdz, M.Ogloza, W.Skvarč, J.Ciabattari, F.Delincak, P.Di Marcantonio, P.Iafrate, G.Coretti, I.Baldini, V.Baruffetti, P.Klös, O.Dumitrescu, V.Mikuž, H.Mohar, A.2023-03-01T20:22:44Z2023-03-01T20:22:44Z2022-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1051/0004-6361/202141842Astronomy and Astrophysics, v. 663.1432-07460004-6361http://hdl.handle.net/11449/24056010.1051/0004-6361/2021418422-s2.0-85135073512Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAstronomy and Astrophysicsinfo:eu-repo/semantics/openAccess2023-03-01T20:22:46Zoai:repositorio.unesp.br:11449/240560Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:59:10.360169Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
title The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
spellingShingle The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
Vara-Lubiano, M.
Kuiper belt objects: individual: 2003 VS2
Methods: observational
Techniques: photometric
title_short The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
title_full The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
title_fullStr The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
title_full_unstemmed The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
title_sort The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
author Vara-Lubiano, M.
author_facet Vara-Lubiano, M.
Benedetti-Rossi, G. [UNESP]
Santos-Sanz, P.
Ortiz, J. L.
Sicardy, B.
Popescu, M.
Morales, N.
Rommel, F. L.
Morgado, B.
Pereira, C. L.
Álvarez-Candal, A.
Fernández-Valenzuela, E.
Souami, D.
Ilic, D.
Vince, O.
Bachev, R.
Semkov, E.
Nedelcu, D. A.
Sonka, A.
Hudin, L.
Boaca, M.
Inceu, V.
Curelaru, L.
Gherase, R.
Turcu, V.
Moldovan, D.
Mircea, L.
Predatu, M.
Teodorescu, M.
Stoian, L.
Juravle, A.
Braga-Ribas, F.
Desmars, J.
Duffard, R.
Lecacheux, J.
Camargo, J. I.B.
Assafin, M.
Vieira-Martins, R.
Pribulla, T.
Husárik, M.
Sivanič, P.
Pal, A.
Szakats, R.
Kiss, C.
Alonso-Santiago, J.
Frasca, A.
Szabó, G. M.
Derekas, A.
Szigeti, L.
Drozdz, M.
Ogloza, W.
Skvarč, J.
Ciabattari, F.
Delincak, P.
Di Marcantonio, P.
Iafrate, G.
Coretti, I.
Baldini, V.
Baruffetti, P.
Klös, O.
Dumitrescu, V.
Mikuž, H.
Mohar, A.
author_role author
author2 Benedetti-Rossi, G. [UNESP]
Santos-Sanz, P.
Ortiz, J. L.
Sicardy, B.
Popescu, M.
Morales, N.
Rommel, F. L.
Morgado, B.
Pereira, C. L.
Álvarez-Candal, A.
Fernández-Valenzuela, E.
Souami, D.
Ilic, D.
Vince, O.
Bachev, R.
Semkov, E.
Nedelcu, D. A.
Sonka, A.
Hudin, L.
Boaca, M.
Inceu, V.
Curelaru, L.
Gherase, R.
Turcu, V.
Moldovan, D.
Mircea, L.
Predatu, M.
Teodorescu, M.
Stoian, L.
Juravle, A.
Braga-Ribas, F.
Desmars, J.
Duffard, R.
Lecacheux, J.
Camargo, J. I.B.
Assafin, M.
Vieira-Martins, R.
Pribulla, T.
Husárik, M.
Sivanič, P.
Pal, A.
Szakats, R.
Kiss, C.
Alonso-Santiago, J.
Frasca, A.
Szabó, G. M.
Derekas, A.
Szigeti, L.
Drozdz, M.
Ogloza, W.
Skvarč, J.
Ciabattari, F.
Delincak, P.
Di Marcantonio, P.
Iafrate, G.
Coretti, I.
Baldini, V.
Baruffetti, P.
Klös, O.
Dumitrescu, V.
Mikuž, H.
Mohar, A.
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dc.contributor.none.fl_str_mv Consejo Superior De Investigaciones Científicas
Cnrs
Bairro Imperial De São Cristóvão (RJ)
Universidade Estadual Paulista (UNESP)
Astronomical Institute Of The Romanian Academy
Instituto De Astrofísica De Canarias (IAC)
Observatório Nacional/MCTI
Partnership 1 Building
University Of Namur
University Of Belgrade
Universität Hamburg
Astronomical Observatory
Bulgarian Academy Of Sciences
ROASTERR-1 Observatory
Stardust Observatory
Astroclubul Bucuresti
Stardreams Observatory
Astronomical Observatory Cluj
University Of Craiova
Institutul De Stiinte Spatiale (ISS)
Societatea Romana Pentru Astronomie Culturala (SRPAC)
Federal University Of Technology - Paraná (UTFPR/DAFIS)
Institut Polytechnique Des Sciences Avancées Ipsa
Univ. Lille
Universidade Federal do Rio de Janeiro (UFRJ)
Astronomical Institute Of The Slovak Academy Of Sciences
Research Centre For Astronomy And Earth Sciences
Osservatorio Astrofísico Di Catania (OACt-INAF)
Gothard Astrophysical Observatory
MTA-ELTE Exoplanet Research Group
Pedagogical University Of Cracow Limanowa County
Santa Cruz De La Palma
Osservatorio Astronomico Di Monte Agliale
PDlink Observatory
Inaf - Osservatorio Astronomico Di Trieste
Eaon
International Occultation Timing Association - European Section (IOTA/ES)
Ia Cu Stele
Crni Vrh Observatory
University Of Ljubljana
Dark Sky Slovenia
dc.contributor.author.fl_str_mv Vara-Lubiano, M.
Benedetti-Rossi, G. [UNESP]
Santos-Sanz, P.
Ortiz, J. L.
Sicardy, B.
Popescu, M.
Morales, N.
Rommel, F. L.
Morgado, B.
Pereira, C. L.
Álvarez-Candal, A.
Fernández-Valenzuela, E.
Souami, D.
Ilic, D.
Vince, O.
Bachev, R.
Semkov, E.
Nedelcu, D. A.
Sonka, A.
Hudin, L.
Boaca, M.
Inceu, V.
Curelaru, L.
Gherase, R.
Turcu, V.
Moldovan, D.
Mircea, L.
Predatu, M.
Teodorescu, M.
Stoian, L.
Juravle, A.
Braga-Ribas, F.
Desmars, J.
Duffard, R.
Lecacheux, J.
Camargo, J. I.B.
Assafin, M.
Vieira-Martins, R.
Pribulla, T.
Husárik, M.
Sivanič, P.
Pal, A.
Szakats, R.
Kiss, C.
Alonso-Santiago, J.
Frasca, A.
Szabó, G. M.
Derekas, A.
Szigeti, L.
Drozdz, M.
Ogloza, W.
Skvarč, J.
Ciabattari, F.
Delincak, P.
Di Marcantonio, P.
Iafrate, G.
Coretti, I.
Baldini, V.
Baruffetti, P.
Klös, O.
Dumitrescu, V.
Mikuž, H.
Mohar, A.
dc.subject.por.fl_str_mv Kuiper belt objects: individual: 2003 VS2
Methods: observational
Techniques: photometric
topic Kuiper belt objects: individual: 2003 VS2
Methods: observational
Techniques: photometric
description Context. Stellar occultations have become one of the best techniques to gather information about the physical properties of trans-Neptunian objects (TNOs), which are critical objects for understanding the origin and evolution of our Solar System. Aims. The purpose of this work is to determine, with better accuracy, the physical characteristics of the TNO (84922) 2003 VS2 through the analysis of the multichord stellar occultation on 2019 October 22 and photometric data collected afterward. Methods. We predicted, observed, and analyzed the multichord stellar occultation of the Second Gaia Data Release (Gaia DR2) source 3449076721168026624 (mÏ = 14.1 mag) by the plutino object 2003 VS2 on 2019 October 22. We performed aperture photometry on the images collected and derived the times when the star disappeared and reappeared from the observing sites that reported a positive detection. We fit the extremities of such positive chords to an ellipse using a Monte Carlo method. We also carried out photometric observations to derive the rotational light curve amplitude and rotational phase of 2003 VS2 during the stellar occultation. Combining the results and assuming a triaxial shape, we derived the 3D shape of 2003 VS2. Results. Out of the 39 observatories involved in the observational campaign, 12 sites, located in Bulgaria (one), Romania (ten), and Serbia (one), reported a positive detection; this makes it one of the best observed stellar occultations by a TNO so far. Considering the rotational phase of 2003 VS2 during the stellar occultation and the rotational light curve amplitude derived (Am = 0.264 ± 0.017 mag), we obtained a mean area-equivalent diameter of DAeq = 545 ± 13 km and a geometric albedo of 0.134 ± 0.010. By combining the rotational light curve information with the stellar occultation results, we derived the best triaxial shape for 2003 VS2, which has semiaxes a = 339 ± 5 km, b = 235 ± 6 km, and c = 226 ± 8 km. The derived aspect angle of 2003 VS2 is θ = 59 ± 2 or its supplementary θ = 121 ± 2, depending on the north-pole position of the TNO. The spherical-volume equivalent diameter is DVeq = 524 ± 7 km. If we consider large albedo patches on its surface, the semi-major axis of the ellipsoid could be ∼ 10 km smaller. These results are compatible with the previous ones determined from the single-chord 2013 and four-chord 2014 stellar occultations and with the effective diameter and albedo derived from Herschel and Spitzer data. They provide evidence that 2003 VS2s 3D shape is not compatible with a homogeneous triaxial body in hydrostatic equilibrium, but it might be a differentiated body and/or might be sustaining some stress. No secondary features related to rings or material orbiting around 2003 VS2 were detected.
publishDate 2022
dc.date.none.fl_str_mv 2022-07-01
2023-03-01T20:22:44Z
2023-03-01T20:22:44Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1051/0004-6361/202141842
Astronomy and Astrophysics, v. 663.
1432-0746
0004-6361
http://hdl.handle.net/11449/240560
10.1051/0004-6361/202141842
2-s2.0-85135073512
url http://dx.doi.org/10.1051/0004-6361/202141842
http://hdl.handle.net/11449/240560
identifier_str_mv Astronomy and Astrophysics, v. 663.
1432-0746
0004-6361
10.1051/0004-6361/202141842
2-s2.0-85135073512
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Astronomy and Astrophysics
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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