An unaccounted component on the Prometheus and Pandora offset angular positions

Detalhes bibliográficos
Autor(a) principal: Santana, Thamiris [UNESP]
Data de Publicação: 2020
Outros Autores: Winter, Othon C. [UNESP], Mourão, Daniela C. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1140/epjst/e2020-900170-0
http://hdl.handle.net/11449/201823
Resumo: Near the turning of this millennium (1996–2004) it was detected that Prometheus and Pandora were not in their angular positions as predicted from their discoveries by the Voyager spacecrafts (1980). This is known as the problem of the lags of Prometheus and Pandora. The explanation for the origin of these lags is the chaotic motion associated with 121:118 mean motion resonance between the satellites. In the present work we revisit this problem and adopting the most extensive set of lags data, given by [R.G. French et al., Icarus 162, 143 (2003)], to show the need of unaccounted effects to produce the measured lags. By the analysis of conservation of angular momentum it can be verified that the mutual interaction between Prometheus and Pandora should be inversely proportional to the ratio of their masses. In this way, only the gravitational interaction between the two satellites does not explain such values. Consequently, the ratio between the lags of Prometheus and Pandora, Q, should be constant, and approximately the value of the inverse ratio between their masses (0.56, from [R.G. French et al., Icarus 162, 143 (2003)]). However, the values of Q from the measured lags are much higher, ranging from 48% up to 68% larger. Beyond that, the values increase over time in a rate given by the equation Q(t = 0.067 + 0.013t). Therefore, this analysis clearly shows the need of other mechanisms beyond the mutual interaction between Prometheus and Pandora in order to produce such values of lags. We estimate that at least one effect that produces an additional variation of mean motion of about 0.45°/year in one of the satellites for about 20 years would be necessary.
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spelling An unaccounted component on the Prometheus and Pandora offset angular positionsNear the turning of this millennium (1996–2004) it was detected that Prometheus and Pandora were not in their angular positions as predicted from their discoveries by the Voyager spacecrafts (1980). This is known as the problem of the lags of Prometheus and Pandora. The explanation for the origin of these lags is the chaotic motion associated with 121:118 mean motion resonance between the satellites. In the present work we revisit this problem and adopting the most extensive set of lags data, given by [R.G. French et al., Icarus 162, 143 (2003)], to show the need of unaccounted effects to produce the measured lags. By the analysis of conservation of angular momentum it can be verified that the mutual interaction between Prometheus and Pandora should be inversely proportional to the ratio of their masses. In this way, only the gravitational interaction between the two satellites does not explain such values. Consequently, the ratio between the lags of Prometheus and Pandora, Q, should be constant, and approximately the value of the inverse ratio between their masses (0.56, from [R.G. French et al., Icarus 162, 143 (2003)]). However, the values of Q from the measured lags are much higher, ranging from 48% up to 68% larger. Beyond that, the values increase over time in a rate given by the equation Q(t = 0.067 + 0.013t). Therefore, this analysis clearly shows the need of other mechanisms beyond the mutual interaction between Prometheus and Pandora in order to produce such values of lags. We estimate that at least one effect that produces an additional variation of mean motion of about 0.45°/year in one of the satellites for about 20 years would be necessary.UNESP – São Paulo State University School of Engineering Guaratinguetá Grupo de Dinâmica Orbital & PlanetologiaUNESP – São Paulo State University School of Engineering Guaratinguetá Grupo de Dinâmica Orbital & PlanetologiaUniversidade Estadual Paulista (Unesp)Santana, Thamiris [UNESP]Winter, Othon C. [UNESP]Mourão, Daniela C. [UNESP]2020-12-12T02:42:43Z2020-12-12T02:42:43Z2020-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1479-1489http://dx.doi.org/10.1140/epjst/e2020-900170-0European Physical Journal: Special Topics, v. 229, n. 8, p. 1479-1489, 2020.1951-64011951-6355http://hdl.handle.net/11449/20182310.1140/epjst/e2020-900170-02-s2.0-85085584835Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEuropean Physical Journal: Special Topicsinfo:eu-repo/semantics/openAccess2024-07-02T14:28:54Zoai:repositorio.unesp.br:11449/201823Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:17:41.476592Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv An unaccounted component on the Prometheus and Pandora offset angular positions
title An unaccounted component on the Prometheus and Pandora offset angular positions
spellingShingle An unaccounted component on the Prometheus and Pandora offset angular positions
Santana, Thamiris [UNESP]
title_short An unaccounted component on the Prometheus and Pandora offset angular positions
title_full An unaccounted component on the Prometheus and Pandora offset angular positions
title_fullStr An unaccounted component on the Prometheus and Pandora offset angular positions
title_full_unstemmed An unaccounted component on the Prometheus and Pandora offset angular positions
title_sort An unaccounted component on the Prometheus and Pandora offset angular positions
author Santana, Thamiris [UNESP]
author_facet Santana, Thamiris [UNESP]
Winter, Othon C. [UNESP]
Mourão, Daniela C. [UNESP]
author_role author
author2 Winter, Othon C. [UNESP]
Mourão, Daniela C. [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Santana, Thamiris [UNESP]
Winter, Othon C. [UNESP]
Mourão, Daniela C. [UNESP]
description Near the turning of this millennium (1996–2004) it was detected that Prometheus and Pandora were not in their angular positions as predicted from their discoveries by the Voyager spacecrafts (1980). This is known as the problem of the lags of Prometheus and Pandora. The explanation for the origin of these lags is the chaotic motion associated with 121:118 mean motion resonance between the satellites. In the present work we revisit this problem and adopting the most extensive set of lags data, given by [R.G. French et al., Icarus 162, 143 (2003)], to show the need of unaccounted effects to produce the measured lags. By the analysis of conservation of angular momentum it can be verified that the mutual interaction between Prometheus and Pandora should be inversely proportional to the ratio of their masses. In this way, only the gravitational interaction between the two satellites does not explain such values. Consequently, the ratio between the lags of Prometheus and Pandora, Q, should be constant, and approximately the value of the inverse ratio between their masses (0.56, from [R.G. French et al., Icarus 162, 143 (2003)]). However, the values of Q from the measured lags are much higher, ranging from 48% up to 68% larger. Beyond that, the values increase over time in a rate given by the equation Q(t = 0.067 + 0.013t). Therefore, this analysis clearly shows the need of other mechanisms beyond the mutual interaction between Prometheus and Pandora in order to produce such values of lags. We estimate that at least one effect that produces an additional variation of mean motion of about 0.45°/year in one of the satellites for about 20 years would be necessary.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T02:42:43Z
2020-12-12T02:42:43Z
2020-05-01
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/10.1140/epjst/e2020-900170-0
European Physical Journal: Special Topics, v. 229, n. 8, p. 1479-1489, 2020.
1951-6401
1951-6355
http://hdl.handle.net/11449/201823
10.1140/epjst/e2020-900170-0
2-s2.0-85085584835
url http://dx.doi.org/10.1140/epjst/e2020-900170-0
http://hdl.handle.net/11449/201823
identifier_str_mv European Physical Journal: Special Topics, v. 229, n. 8, p. 1479-1489, 2020.
1951-6401
1951-6355
10.1140/epjst/e2020-900170-0
2-s2.0-85085584835
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv European Physical Journal: Special Topics
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1479-1489
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)
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