Saturn gravity results obtained from Pioneer 11 tracking data and earth-based Saturn satellite data

Null, G. W.; Lau, E. L.; Biller, E. D.; Anderson, J. D.

doi:10.1086/112905

Cited by 64 publications

(15 citation statements)

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“…Each maneuver caused a change in spacecraft spin and a velocity increment in the spacecraft trajectory, immediately followed by two to three days of gas leakage, large enough to be observable in the Doppler data [67].…”

Section: E Modeling Of Maneuversmentioning

confidence: 99%

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Study of the anomalous acceleration of Pioneer 10 and 11

et al. 2002

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Our previous analyses of radio Doppler and ranging data from distant spacecraft in the solar system indicated that an apparent anomalous acceleration is acting on Pioneer 10 and 11, with a magnitude aP ∼ 8 × 10 −8 cm/s 2 , directed towards the Sun. Much effort has been expended looking for possible systematic origins of the residuals, but none has been found. A detailed investigation of effects both external to and internal to the spacecraft, as well as those due to modeling and computational techniques, is provided. We also discuss the methods, theoretical models, and experimental techniques used to detect and study small forces acting on interplanetary spacecraft. These include the methods of radio Doppler data collection, data editing, and data reduction.There is now further data for the Pioneer 10 orbit determination.

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Section: E Modeling Of Maneuversmentioning

confidence: 99%

“…(For a summary see Milani et al [57].) With regard to the specific Pioneer spacecraft, possible sources of systematic acceleration have been discussed before for Pioneer 10 and 11 at Jupiter [87] and Pioneer 11 at Saturn [67].…”

Section: Sources Of Systematic Error External To the Spacecraftmentioning

confidence: 99%

Study of the anomalous acceleration of Pioneer 10 and 11

et al. 2002

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“…We did not estimate a, d$/dt, or d/dt but instead computed their values from the secular perturbation formulae given in Null et al (1981); their uncertainties are based on the errors in the mean motion and in the second zonal harmonic of Saturn's gravity field.…”

Section: Panmentioning

confidence: 99%

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

Spitale

Jacobson

Porco

et al. 2006

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We report on the orbits of the small, inner Saturnian satellites, either recovered or newly discovered in recent Cassini imaging observations. The orbits presented here reflect improvements over our previously published values in that the time base of Cassini observations has been extended, and numerical orbital integrations have been performed in those cases in which simple precessing elliptical, inclined orbit solutions were found to be inadequate. Using combined Cassini and Voyager observations, we obtain an eccentricity for Pan 7 times smaller than previously reported because of the predominance of higher quality Cassini data in the fit. The orbit of the small satellite (S/2005 S1 [Daphnis]) discovered by Cassini in the Keeler gap in the outer A ring appears to be circular and coplanar; no external perturbations are apparent. Refined orbits of Atlas, Prometheus, Pandora, Janus, and Epimetheus are based on Cassini , Voyager, Hubble Space Telescope, and Earth-based data and a numerical integration perturbed by all the massive satellites and each other. Atlas is significantly perturbed by Prometheus, and to a lesser extent by Pandora, through high-wavenumber mean-motion resonances. Orbital integrations involving Atlas yield a mass of GM Atlas ¼ (0:44 AE 0:04) ; 10 À3 km 3 s À2, 3 times larger than reported previously (GM is the product of the Newtonian constant of gravitation G and the satellite mass M ). Orbital integrations show that Methone is perturbed by Mimas, Pallene is perturbed by Enceladus, and Polydeuces librates around Dione's L5 point with a period of about 791 days. We report on the nature and orbits of bodies sighted in the F ring, two of which may have persisted for a year or more.

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“…The set of mean orbital elements given here for Polydeuces was developed by fitting a precessing ellipse to the integration over the time span 1 January 2004 to 1 January 2009 and correcting the mean longitude to account for the libration. We compute the values of a, d;/dt, or dW/dt from the formulae given in (75); their uncertainties stem from the errors in the satellites' mean motions and the error in the second zonal harmonic of Saturn's gravity field.…”

mentioning

confidence: 99%

Cassini Imaging Science: Initial Results on Saturn's Rings and Small Satellites

Porco

Baker

Barbara

et al. 2005

Science

184

128

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Images acquired of Saturn's rings and small moons by the Cassini Imaging Science Subsystem (ISS) during the first 9 months of Cassini operations at Saturn have produced many new findings. These include new saturnian moons; refined orbits of new and previously known moons; narrow diffuse rings in the F-ring region and embedded in gaps within the main rings; exceptionally fine-scale ring structure in moderateâ to highâoptical depth regions; new estimates for the masses of ring-region moons, as well as ring particle properties in the Cassini division, derived from the analysis of linear density waves; ring particle albedos in select ring regions; and never-before-seen phenomena within the rings.

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Saturn gravity results obtained from Pioneer 11 tracking data and earth-based Saturn satellite data

Cited by 64 publications

References 0 publications

Study of the anomalous acceleration of Pioneer 10 and 11

Study of the anomalous acceleration of Pioneer 10 and 11

The Orbits of Saturn's Small Satellites Derived from Combined Historic andCassiniImaging Observations

Cassini Imaging Science: Initial Results on Saturn's Rings and Small Satellites

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