Cassini ISS astrometry of Saturnian satellites J/AJ/149/27 ivo://CDS.VizieR/J/AJ/149/27 doi:10.26093/cds/vizier.51490027 CDS Cooper N.J. Renner S. Murray C.D. Evans M.W. 2018-01-30T07:18:08Z 2015-04-10T15:18:48Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr solar-system asteroids astrometry We present numerically derived orbits and mass estimates for the inner Saturnian satellites, Atlas, Prometheus, Pandora, Janus, and Epimetheus from a fit to 2580 new Cassini Imaging Science Subsystem astrometric observations spanning 2004 February to 2013 August. The observations are provided as machine-readable and Virtual Observatory tables. We estimate GM_Atlas_=(0.384+/-0.001)x10^-3^km^3^/s^2^, a value 13% smaller than the previously published estimate but with an order of magnitude reduction in the uncertainty. We also find GM_Prometheus_=(10.677+/-0.006)x10^-3^km^3^/s^2^, GM_Pandora_=(9.133+/-0.009)x10^-3^km^3^/s^2^, GM_Janus_=(126.51+/-0.03)x10^-3^km^3^/s^2^, and GM_Epimetheus_=(35.110+/-0.009)x10^-3^km^3^/s^2^, consistent with previously published values, but also with significant reductions in uncertainties. We show that Atlas is currently librating in both the 54:53 co-rotation-eccentricity resonance (CER) and the 54:53 inner Lindblad (ILR) resonance with Prometheus, making it the latest example of a coupled CER-ILR system, in common with the Saturnian satellites Anthe, Aegaeon, and Methone, and possibly Neptune's ring arcs. We further demonstrate that Atlas's orbit is chaotic, with a Lyapunov time of ~10years, and show that its chaotic behavior is a direct consequence of the coupled resonant interaction with Prometheus, rather than being an indirect effect of the known chaotic interaction between Prometheus and Pandora. We provide an updated analysis of the second-order resonant perturbations involving Prometheus, Pandora, and Epimetheus based on the new observations, showing that these resonant arguments are librating only when Epimetheus is the innermost of the co-orbital pair, Janus and Epimetheus. We also find evidence that the known chaotic changes in the orbits of Prometheus and Pandora are not confined to times of apse anti-alignment. 2015AJ....149...27C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/27 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/322 : UCAC4 Catalogue (Zacharias+, 2012) I/289 : UCAC2 Catalogue (Zacharias+ 2004) I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/A+A/572/A43 : Saturnian satellites Cassini ISS astrometry (Cooper+, 2014) J/A+A/551/A129 : Mimas and Enceladus Cassini ISS astrometry (Tajeddine+ 2013) J/A+A/544/A29 : 2009 Saturnian satellites mutual events (Arlot+, 2012) J/other/SoSyR/45.523 : Saturnian satellites CCD observations (Grosheva+, 2011) J/A+A/400/1095 : 1995-99 CCD observation of Saturnian satellite (Veiga+, 2003) J/A+A/383/296 : Saturnian Satellites positions (1996-2000) (Peng+, 2002) J/A+A/380/727 : 1995 Saturnian satellite observations (Vienne+, 2001) J/A+AS/139/47 : 1995 Saturnian satellites mutual events (Emelianov+, 1999) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/27 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/27 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/27 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/27 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/27 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/27 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/149/27/table3 (Sample of Cassini Imaging Science Subsystem (ISS) observations) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/27/table3? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/27/table3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/27/table3? 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https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/27?format=ascii default J/AJ/149/27/table3 Sample of Cassini Imaging Science Subsystem (ISS) observations recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Image Image identifier meta.id;obs.image char Obs UTC date of the observation start s time.start;obs nullable RAideg Image Right Ascension in decimal degrees (J2000) (1) deg pos.eq.ra DEideg Image Declination in decimal degrees (J2000) (1) deg pos.eq.dec Twist [0/360] Twist angle of the camera optical axis (1) deg instr.param double Line Measured line value (2) pix pos.cartesian.x;instr.det float Sample Measured sample value (2) pix pos.cartesian.y;instr.det float RAJ2000 Object Right Ascension in decimal degrees (J2000) (1) deg pos.eq.ra;meta.main DEJ2000 Object Declination in decimal degrees (J2000) (1) deg pos.eq.dec;meta.main Sat Satellite name (3) meta.id;instr.tel char
J/AJ/149/27/table1 Spacecraft Planet Instrument C-matrix Events (SPICE) kernels used in orbit determination and numerical modeling recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Kernel Name of the latest SPICE Kernel (1) meta.id;meta.file char
J/AJ/149/27/sat Summary of Cassini Imaging Science Subsystem (ISS) observations (table2) and solutions for the planetocentric state vectors in the ICRF at epoch 2007-06-01 00:00:00.0 UTC (2007-06-01 00:01:05.184 or JD2454252.50075446 TDB) (table 6) Sat Satellite name meta.id;instr.tel char primary O-Cs The rms O-C residual in sample direction (3) km stat.fit.residual float recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Obs0 Starting date of observation s time.start;obs nullable Obs1 Ending date of observation s time.end;obs nullable Nt Total number of observations (1) meta.number int N1 Center-of-light (number of observations centroided) (2) meta.number int N2 Center-of-figure (number of observations limb-fitted) (2) meta.number int O-Cl The rms O-C residual in the line direction (3) km stat.fit.residual float x Value of the parameter x (6) km pos.cartesian.x;obs.field double e_x Uncertainty in x km stat.error float y Value of the parameter y (6) km pos.cartesian.y double e_y Uncertainty in y km stat.error float z Value of the parameter z (6) km pos.frame;obs.field double e_z Uncertainty in z km stat.error float dx/dt Value of the parameter dx/dt (6) km/s phys.veloc;stat.param double e_dx/dt Uncertainty in dx/dt km/s stat.error double dy/dt Value of the parameter dy/dt (6) km/s phys.veloc;stat.param double e_dy/dt Uncertainty in dy/dt km/s stat.error double dz/dt Value of the parameter dz/dt (6) km/s phys.veloc;stat.param double e_dz/dt Uncertainty in dz/dt km/s stat.error double