scholarly journals Gravity tests with INPOP planetary ephemerides

2009 ◽  
Vol 5 (S261) ◽  
pp. 159-169 ◽  
Author(s):  
A. Fienga ◽  
J. Laskar ◽  
P. Kuchynka ◽  
C. Leponcin-Lafitte ◽  
H. Manche ◽  
...  
Keyword(s):  
Solar System ◽  
The Sun ◽  
Constant Acceleration ◽  
Pioneer Anomaly

AbstractWe present here several gravity tests made with the latest INPOP08 planetary ephemerides. We first propose two methods to estimate the PPN parameter β and its correlated value, the Sun J2, and we discuss the correlation between the Sun J2 and the mass of the asteroid ring. We estimate a possible advance in the planet perihelia. We also show that no constant acceleration larger than 1/4 of the Pioneer anomaly is compatible with the observed motion of the planets in our Solar System.

Another Potential Explanation for Pioneer Anomaly Cosmic Drag of an Orbit

2012 ◽  
Vol 433-440 ◽  
pp. 1587-1591
Author(s):  
Wei Jia Zhang
Keyword(s):  
Orbital Evolution ◽  
The Sun ◽  
Radio Tracking ◽  
Independent Research ◽  
Constant Acceleration ◽  
Potential Explanation ◽  
Pioneer Anomaly ◽  
Evolution Study ◽  
Pioneer 10

Analysis of the radio tracking data from the Pioneer 10/11 spacecraft at distances between about 20–70 AU from the Sun has consistently indicated the presence of a constant acceleration of 8.6× 10−8 cm/s−2 directed towards the Sun. This has been one of the most interesting and intriguing astrophysical problems in the last decade. Currently, an independent research rises from the planetary long-term orbital evolution study and may be helpful to understand the nature of Pioneer Anomaly. Furthermore, calculation shows that the Pioneer data match with the new discovery’s prediction very well.

scholarly journals Testing alternate gravitational theories

2009 ◽  
Vol 5 (S261) ◽  
pp. 179-182 ◽  
Author(s):  
E. M. Standish
Keyword(s):  
Equations Of Motion ◽  
The Sun ◽  
Constant Acceleration ◽  
Gravitational Theories ◽  
Pioneer Anomaly ◽  
The Future ◽  
Gravitational Equations

AbstractThe planetary ephemerides are used to examine different suggested forms of the gravitational equations of motion which could possibly cause the observed Pioneer Anomaly. It is shown that most of the forms would be unacceptable, including that generally assumed – a constant acceleration directed toward the Sun. The tests show that three other forms could not exist within 10 au's of the Sun. Only one suggested form would be compatible with the Pioneer Anomaly affecting Saturn or any other more inward planet. Additional planetary observations in the future may possibly eliminate this form also.

scholarly journals Squeezing of the Super-Elastic Double-Helix Photon in the Gravitational Field (Hidden in Very-Well Known Old Formulae). Pound - Rebka - Snider Effect Studied by the Advanced LIGO Instrument, Pioneer Anomaly and CMB (Cosmic Microwave Background) (23.11.201

2019 ◽  
Vol 12 (1) ◽  
pp. 8
Author(s):  
Jiri Stavek
Keyword(s):  
Gravitational Field ◽  
Solar System ◽  
Double Helix ◽  
The Sun ◽  
The Moon ◽  
Gravitational Fields ◽  
The Earth ◽  
Pioneer Anomaly ◽  
Squeeze Rate ◽  
Squeeze Effect

In our approach we have combined knowledge of Old Masters (working in this field before the year 1905), New Masters (working in this field after the year 1905) and Dissidents under the guidance of Louis de Broglie and David Bohm. Based on the great experimental work of Robert Pound, Glen A. Rebka and J.L. Snider we have proposed a squeezing of the super-elastic double-helix photon in the gravitational field. We have newly defined the squeeze rate of that photon particle on the helical path. We have inserted this squeeze rate into the very-well old formulae of Newton, Soldner, Gerber and Einstein and might glimpse traces of the quantum gravity. The squeeze rate of photons can be studied in details using the Great instrument - the Advanced LIGO - located on the surface of the Earth (USA, Italy, Japan). The observed strains on the level 5*10-19 should be caused by the gravitational field of our Earth. The observed strains on the level 5*10-22 should be caused by the gravitational fields of the Moon and the Sun. We estimate that the experimental value of the gravitational constant G studied by the LIGO instrument can achieve the accuracy to the level of ppb (parts per billion) after the removal of those strains from the measured signal and the removal of the gravitational influences of the Earth, the Moon, the Sun, Venus and Jupiter. To study the squeeze effect on a bigger scale we propose to analyze the Pioneer anomaly where Pioneer´s photons have been flying around the planets in our Solar system causing the squeeze effect - the anomalous blueshift. Similarly, we can study cosmic microwave photons flying around the objects in our Solar system that might create “the axis of evil” - temperature fluctuations in the CMB map (Wien displacement law). Can we prepare in our Solar system “tired” light by frequent blueshift - redshift transitions? Can it be that Nature cleverly inserted the squeeze rate into our very-well known Old Formulae? We want to pass this concept into the hands of Readers of this Journal better educated in the Mathematics and Physics.

PIONEER ANOMALY? GRAVITATIONAL PULL DUE TO THE KUIPER BELT

2006 ◽  
Vol 15 (04) ◽  
pp. 533-544 ◽  
Author(s):  
JOSÉ A. DE DIEGO ◽  
DARÍO NÚÑEZ ◽  
JESÚS ZAVALA
Keyword(s):  
Density Distribution ◽  
Kuiper Belt ◽  
Blue Shift ◽  
The Sun ◽  
Matter Distribution ◽  
Constant Acceleration ◽  
Pioneer Anomaly ◽  
Gravitational Influence ◽  
Gravitational Pull

In this work, we study the gravitational influence of the material extending from Uranus orbit to the Kuiper belt and beyond on objects moving within these regions. We conclude that a density distribution given by [Formula: see text] generates a constant acceleration towards the Sun on those objects, which, with the proper amount of mass, accounts for the blue shift detected on the Pioneers space crafts. We also discuss the effect of this gravitational pull on Neptune, and comment on the possible origin of such a matter distribution.

scholarly journals The Principle of Least Interaction Action

1974 ◽  
Vol 3 ◽  
pp. 489-489
Author(s):  
M. W. Ovenden
Keyword(s):  
Solar System ◽  
Planetary System ◽  
Satellite System ◽  
Asteroid Belt ◽  
Correct Prediction ◽  
The Sun ◽  
Approximate Methods ◽  
Satellites Of Jupiter ◽  
History Of ◽  
Minimum Interaction

AbstractThe intuitive notion that a satellite system will change its configuration rapidly when the satellites come close together, and slowly when they are far apart, is generalized to ‘The Principle of Least Interaction Action’, viz. that such a system will most often be found in a configuration for which the time-mean of the action associated with the mutual interaction of the satellites is a minimum. The principle has been confirmed by numerical integration of simulated systems with large relative masses. The principle lead to the correct prediction of the preference, in the solar system, for nearly-commensurable periods. Approximate methods for calculating the evolution of an actual satellite system over periods ˜ 109 yr show that the satellite system of Uranus, the five major satellites of Jupiter, and the five planets of Barnard’s star recently discovered, are all found very close to their respective minimum interaction distributions. Applied to the planetary system of the Sun, the principle requires that there was once a planet of mass ˜ 90 Mθ in the asteroid belt, which ‘disappeared’ relatively recently in the history of the solar system.

scholarly journals The frequency of stellar X-ray flares from a large-scale XMM-Newton sample

2015 ◽  
Vol 11 (S320) ◽  
pp. 134-137
Author(s):  
John P. Pye ◽  
Simon R. Rosen
Keyword(s):  
Solar System ◽  
Solar Flare ◽  
Space Weather ◽  
White Light ◽  
Large Scale ◽  
The Sun ◽  
X Ray ◽  
Cool Star ◽  
Exoplanetary Systems ◽  
Solar Type

AbstractWe present estimates of cool-star X-ray flare rates determined from the XMM-Tycho survey (Pyeet al. 2015, A&A, 581, A28), and compare them with previously published values for the Sun and for other stellar EUV and white-light samples. We demonstrate the importance of applying appropriate corrections, especially in regard to the total, effective size of the stellar sample. Our results are broadly consistent with rates reported in the literature for Kepler white-light flares from solar-type stars, and with extrapolations of solar flare rates, indicating the potential of stellar X-ray flare observations to address issues such as ‘space weather’ in exoplanetary systems and our own solar system.

Understanding Space Weather: Part II: The Violent Sun

2017 ◽  
Vol 98 (11) ◽  
pp. 2387-2396 ◽  
Author(s):  
Keith T. Strong ◽  
Joan T. Schmelz ◽  
Julia L. R. Saba ◽  
Therese A. Kucera
Keyword(s):  
Solar System ◽  
Interplanetary Space ◽  
Navigation Systems ◽  
The Sun ◽  
Short Term ◽  
Radio Emissions ◽  
Electrical Grids ◽  
Large Flare ◽  
Major Eruption ◽  
Violent Events

Abstract The Sun is often racked by short-term violent events such as flares and coronal mass ejections (CMEs) but these two phenomena are often confused. Both are caused by the release of energy due to the reconnection of stressed and unstable magnetic fields. Flares bathe the solar system in electromagnetic radiation from gamma rays to radio emissions. CMEs throw billions of tons of solar plasma into interplanetary space at velocities of over 1,000 km s−1. Flares can occur without significant ejecta being spewed out from the Sun into the solar system. CMEs can occur without a significant flare being detected. The most violent and dangerous events occur when a large flare is accompanied by a major eruption. These violent events are much more common near solar maximum but can occur at any time during the solar cycle, so we are rarely completely immune to their effects. Various types of solar activity can lead to problems with electrical grids, navigation systems, and communications, and can present a hazard to astronauts, as will be discussed in future papers in this series.

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