J/AJ/146/12ivo://CDS.VizieR/J/AJ/146/12doi:10.26093/cds/vizier.51460012CDSHedman M.M.Nicholson P.D.2021-08-23T06:55:24Z2014-06-06T14:20:23ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsolar-system-planetsoccultationSaturn's C ring contains multiple spiral patterns that appear to be density waves driven by periodic gravitational perturbations. In other parts of Saturn's rings, such waves are generated by Lindblad resonances with Saturn's various moons, but most of the wave-like C-ring features are not situated near any strong resonance with any known moon. Using stellar occultation data obtained by the Visual and Infrared Mapping Spectrometer on board the Cassini spacecraft, we investigate the origin of six unidentified C-ring waves located between 80900 and 87200km from Saturn's center. By measuring differences in the waves' phases among the different occultations, we are able to determine both the number of arms in each spiral pattern and the speeds at which these patterns rotate around the planet. We find that all six of these waves have between two and four arms and pattern speeds between 1660{deg}/day and 1861{deg}/day. These speeds are too large to be attributed to any satellite resonance. Instead, they are comparable to the predicted pattern speeds of waves generated by low-order normal-mode oscillations within the planet. The precise pattern speeds associated with these waves should therefore provide strong constraints on Saturn's internal structure. Furthermore, we identify multiple waves with the same number of arms and very similar pattern speeds, indicating that multiple m=3 and m=2 sectoral (l=m) modes may exist within the planet.2013AJ....146...12Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/146/12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/493/1183 : Saturn major satellites observations (1874-2007)J/AJ/136/2214 : Positions of Saturn and its satellites in 2002-2006J/A+A/485/293 : Events of Saturn satellites during 2009 equinox (Arlot+, 2008)J/A+A/422/377 : 1997-2000 Saturn's satellites astrometry (Qiao+, 2004)J/A+A/383/1054 : Astrometry of Pluto and Saturn in 1995-2001 (Rapaport+, 2002)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)J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)J/A+AS/136/257 : Saturn's satellites in 1995/97 (Harper+ 1999)J/A+AS/121/65 : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)J/AJ/103/983 : Stellar occultation candidates of Saturn (Bosh+, 1992)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/146/12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/146/12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/146/12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/146/12https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/146/12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/146/12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/146/12/stars (Stars in the occultation pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/146/12/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/146/12/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/146/12/stars?GETtext/xml+votable180.050000true202.42825-23.28133330.0055555555555555566/1504 4972 13392 13813 42956 43141 44018 46321https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/146/12?format=asciidefaultJ/AJ/146/12/table5Time, longitude, and phase differences used to determine pattern speedsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWaveWave designation (1)Mmpos.distancefloatName1Name of the first star in the occultation pair (2)meta.id.assoccharRev1First "Rev" number of the occultation pair (3)meta.idintC1[ie] Cut obtained during ingress (i) or egress (e)pos.lunar.occultcharName2Name of second star in the occultation pair (2)meta.id.assoccharRev2Second "Rev" number of the occultation pair (3)meta.idintn_Rev2[ie] Cut obtained during ingress (i) or egress (e)meta.notechardtObserved time difference {delta}tdtime.epoch;arith.diffdoubledlObserved longitude difference {delta}{lambda}degpos;arith.difffloatdphiPhase difference {delta}{phi} between wavesdegstat.fit.paramfloate_dphiStandard deviation of the phase differencedegstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/146/12/starsStars in the occultation pairsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the starmeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlchar