High precision thermal modeling of complex systems with application to the flyby and Pioneer anomaly

Rievers, Benny; Lämmerzahl, Cláus

doi:10.1002/andp.201100081

Cited by 83 publications

(67 citation statements)

References 12 publications

(24 reference statements)

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“…[229][230][231][232] The fruits of such hard and heroic efforts were not long in coming. Indeed, by analyzing the new data, conviction that suitably designed thermal models could likely explain the PA 219,[232][233][234][235][236][237][238][239] began to make its way. In 2012, it was shown 240 that an appropriate model of the recoil force associated with an anisotropic emission of thermal radiation off the spacecraft is able to accommodate about 80% of the unexplained acceleration plaguing the telemetry of both the Pioneer probes as far as its magnitude, temporal behavior, and direction are concerned.…”

Section: The Pioneer Anomalymentioning

confidence: 99%

Gravitational anomalies in the solar system?

Iorio

2015

Int. J. Mod. Phys. D

100

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Mindful of the anomalous perihelion precession of Mercury discovered by U. Le Verrier in the second half of the nineteenth century and its successful explanation by A. Einstein with his General Theory of Relativity in the early years of the twentieth century, discrepancies among observed effects in our Solar system and their theoretical predictions on the basis of the currently accepted laws of gravitation applied to known matter-energy distributions have the potential of paving the way for remarkable advances in fundamental physics. This is particularly important now more than ever, given that most of the universe seems to be made of unknown substances dubbed Dark Matter and Dark Energy. Should this not be directly the case, Solar system's anomalies could anyhow lead to advancements in either cumulative science, as shown to us by the discovery of Neptune in the first half of the nineteenth century, and technology itself. Moreover, investigations in one of such directions can serendipitously enrich the other one as well. The current status of some alleged gravitational anomalies in the Solar system is critically reviewed. They are: a) Possible anomalous advances of planetary perihelia; b) Unexplained orbital residuals of a recently discovered moon of Uranus (Mab); c) The lingering unexplained secular increase of the eccentricity of the orbit of the Moon; d) The so-called Faint Young Sun Paradox; e) The secular decrease of the mass parameter of the Sun; f) The Flyby Anomaly; g) The Pioneer Anomaly; and h) The anomalous secular increase of the astronomical unit

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Section: The Pioneer Anomalymentioning

confidence: 99%

Gravitational anomalies in the solar system?

Iorio

2015

Int. J. Mod. Phys. D

100

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“…Apart from the aesthetic appeal Finsler geometry has for many authors, Finsler spacetimes have been recently suggested as a possible explanation for dark matter [6], and they have been used in an attempt for explaining the Pioneer anomaly [15]. (As it has now become clear that the latter can be explained as a thermal recoil effect [20], also cf. [8] and [28], this motivation should be considered as obsolete.)…”

Section: Introductionmentioning

confidence: 99%

Observable effects in a class of spherically symmetric static Finsler spacetimes

2012

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After some introductory discussion of the definition of Finsler spacetimes and their symmetries, we consider a class of spherically symmetric and static Finsler spacetimes which are small perturbations of the Schwarzschild spacetime. The deviations from the Schwarzschild spacetime are encoded in three perturbation functions φ0(r), φ1(r) and φ2(r) which have the following interpretations: φ0 perturbs the time function, φ1 perturbs the radial length measurement and φ2 introduces a spatial anisotropy which is a genuine Finsler feature. We work out the equations of motion for freely falling particles and for light rays, i.e. the timelike and lightlike geodesics, in this class of spacetimes, and we discuss the bounds placed on the perturbation functions by observations in the Solar system.

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“…Finite element modeling methods by Rievers et al (2009Rievers et al ( , 2010Rievers et al ( , 2011 give an analysis which "likely resolves the anomalous acceleration observed for Pioneer 10". When the whole anomaly could be explained , the Pioneer anomaly becomes "not of strong interest anymore" (Selig et al 2012).…”

Section: Spacecraft Thermal Effectsmentioning

confidence: 99%

Scope for a small circumsolar annular gravitational contribution to the Pioneer anomaly without affecting planetary orbits

Moore¹,

Moore²

2013

Astrophys Space Sci

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All proposed gravitational explanations of the Pioneer anomaly must crucially face the Equivalence Principle. Thus, if Pioneers 10 and 11 were influenced by anomalous gravitational effects in regions containing other Solar System bodies, then those bodies should likewise be influenced, irrespective of their shape, composition or mass. Although the lack of any observed influence upon planetary orbits severely constrains such explanations, here we aim to construct by computer modeling, hypothetical gravitating annuli having no gravitational impact on planetary orbits from Mercury to Neptune. One model has a central zone, free of radial gravitation in the annular plane, and an 'onset' beyond Saturn's orbit, where sunward annular gravitation increases to match the Pioneer anomaly data. Sharp nulls are included so that Uranus and Neptune escape this influence. Such models can be proportionately reduced in mass: a 1 % contribution to the anomaly requires an annulus of approximately 1 Earth mass. It is thus possible to comply with the JPL assessment of newly recovered data attributing 80 %, or more, of the anomaly to spacecraft heat, which appears to allow small contributions from other causes. Following the possibility of an increasing Kuiper belt density at great ranges, another model makes an outward small anomalous gravitation in the TNO region, tallying with an observed slight indication of such an effect, suggesting that New Horizons may slightly accelerate in this region.G.S.M. Moore ( ) · R.E.M. Moore

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High precision thermal modeling of complex systems with application to the flyby and Pioneer anomaly

Cited by 83 publications

References 12 publications

Gravitational anomalies in the solar system?

Gravitational anomalies in the solar system?

Observable effects in a class of spherically symmetric static Finsler spacetimes

Scope for a small circumsolar annular gravitational contribution to the Pioneer anomaly without affecting planetary orbits

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