scholarly journals «Space Kamikazes» Will Help Defence the Earth

2020 ◽  
pp. 44-51
Author(s):  
Anatoly V. Zaitsev
Keyword(s):  
Comet Nucleus ◽  
Artificial Earth Satellites ◽  
The Earth ◽  
Celestial Bodies ◽  
Artificial Earth

The article provides a justification for the possibility of using some artificial earth satellites and spacecraft that are being prepared for launch to exert a kinetic impact on asteroids and comet nucleus in order to destroy them. This will prevent catastrophic collisions with the Earth of celestial bodies ranging in size from tens to hundreds of meters. Suggestions are given on how to prepare for the use of this method.

scholarly journals Very First Results of the Medoc Experiment

1979 ◽  
Vol 82 ◽  
pp. 295-300
Author(s):  
F. Nouel ◽  
D. Gambis
Keyword(s):  
Artificial Earth Satellites ◽  
The Earth ◽  
Doppler Observation ◽  
Independent Analysis ◽  
First Results ◽  
Artificial Earth

It is already well known that the coordinates of the pole can be derived not only by the classical astronomical methods but also from analysis of the orbits of artificial Earth satellites. The MEDOC experiment (Motion of the Earth by Doppler Observation Campaign) has been initiated by the Groupe de Recherches de Géodésie Spatiale (GRGS) to provide observations and undertake independent analysis for this purpose. Several organisations are participating.

scholarly journals Motion of the Core, and Its Influence on the Earth's Axis

1972 ◽  
Vol 48 ◽  
pp. 185-188
Author(s):  
Jose Mateo
Keyword(s):  
Gravitational Force ◽  
Slow Motion ◽  
The Core ◽  
Artificial Earth Satellites ◽  
The Earth ◽  
Accurate Knowledge ◽  
Secular Variations ◽  
Artificial Earth ◽  
Rotation Of The Earth ◽  
Centers Of Mass

After the advent of artificial Earth satellites, an accurate knowledge of the harmonic coefficients of the Earth's potential has enabled us to determine the size and shape of the Earth with extraordinary accuracy.The gravitational force between the core and the rest of the Earth, which makes both centers of mass tend to coincide, is so enormous that there is a strong possibility of a very slow motion of the core forcing its way into the mantle. It includes secular variations in both latitude and the time of rotation of the Earth.

Role of Artificial Earth Satellites in Redefinition of the North American Datum

1974 ◽  
Vol 28 (5) ◽  
pp. 590-597 ◽  
Author(s):  
Richard J. Anderle
Keyword(s):  
Reference Frame ◽  
North American ◽  
Center Of Mass ◽  
Satellite Observations ◽  
The North ◽  
Artificial Earth Satellites ◽  
The Earth ◽  
Artificial Earth ◽  
Terrestrial Network

Satellite observations provide a reference frame for terrestrial survey whose origin is within one metre of the center of mass of the earth, whose z-axis is parallel to the CIO pole to the equivalent of five metres at the earth’s surface, and whose scale has an accuracy of about a part per million. A convention needs to be adopted to define the longitude origin. A well adjusted terrestrial network can be transformed to this system to about one-metre accuracy. Densification of the terrestrial network can be accomplished to 1.5 metre accuracy with the use of less than four days of Doppler observations for each site.

scholarly journals Vitaly Grigorevsky’s Contribution to the Development of International Cooperation in Photometric Studies of Artificial Earth Satellites

2020 ◽  
Vol 8 (2) ◽  
pp. 115-127
Author(s):  
Iryna Hrushytska ◽  
Keyword(s):  
Artificial Satellites ◽  
Scientific School ◽  
Scientific Cooperation ◽  
Artificial Earth Satellites ◽  
The Earth ◽  
British Scientist ◽  
Cooperative Partnership ◽  
Artificial Earth ◽  
Mathematical Sciences ◽  
Academy Of Sciences

This article highlights the participation of the Ukrainian scientist, Professor Vitaly Mikhailovich Grigorevsky, doctor of physical and mathematical sciences, and representative of the scientific school of Vladimir Platonovich Tsesevich, in the organization and development of international cooperative partnership in the field of satellite astronomy and photometric studies of artificial satellites of the Earth. The activity of the scientist in the coordination of scientific research of the countries of Eastern Europe in 1965–1973 under the SPIN program, carried out under the auspices of the Astronomical Council of the USSR Academy of Sciences, is discussed. The article explores the main forms of Grigorevsky’s scientific cooperation with the world’s leading experts in the field of satellite astronomy—the British scientist Desmond King-Hele, the Czech astronomer František Link, Hungarian researchers Iván Almár and D. Toth, and others. Also, the achievements of the Latvian researchers Māris Ābele and Kasimirs Lapushka in the creation of photographic cameras of surveillance of satellites are analysed.

scholarly journals LUNAR SYSTEM CONSTRAINTS ON THE MODIFIED THEORIES OF GRAVITY

2013 ◽  
Vol 22 (09) ◽  
pp. 1350064 ◽  
Author(s):  
QASEM EXIRIFARD
Keyword(s):  
Laser Ranging ◽  
Modified Theories Of Gravity ◽  
Lunar Laser Ranging ◽  
Modified Newtonian Dynamics ◽  
Artificial Earth Satellites ◽  
Newtonian Dynamics ◽  
The Earth ◽  
Lunar Laser ◽  
Artificial Earth ◽  
Theories Of Gravity

The Modified Newtonian Dynamics (MOND) paradigm to the missing mass problem requires introducing a functional that is to be identified through observations and experiments. We consider the aquadratic Lagrangian theory as a realization of the MOND. We show that the accurate value of the Earth GM measured by the lunar laser ranging measurements and that by various artificial Earth satellites, including the accurate tracking of the LAGEOS satellites, constrain this functional such that some of the chosen/proposed functional are refuted.

OBSERVATIONS OF ARTIFICIAL EARTH SATELLITES IN UZHGOROD UNIVERSITY: APPLIED AND FUNDAMENTAL ASPECTS

2000 ◽  
Vol 6 (0) ◽  
pp. 98-112
Author(s):  
М. В. Братійчук ◽  
А. Г. Кириченко ◽  
В. П. Єпішев
Keyword(s):  
Artificial Earth Satellites ◽  
Artificial Earth

scholarly journals General relativistic effects acting on the orbits of Galileo satellites

2021 ◽  
Vol 133 (4) ◽  
Author(s):  
K. Sośnica ◽  
G. Bury ◽  
R. Zajdel ◽  
K. Kazmierski ◽  
J. Ventura-Traveset ◽  
...  
Keyword(s):  
General Relativity ◽  
Orbit Determination ◽  
Final Height ◽  
Precise Orbit Determination ◽  
Satellite System ◽  
De Sitter ◽  
Circular Orbits ◽  
Precise Orbit ◽  
Artificial Earth Satellites ◽  
Artificial Earth

AbstractThe first pair of satellites belonging to the European Global Navigation Satellite System (GNSS)—Galileo—has been accidentally launched into highly eccentric, instead of circular, orbits. The final height of these two satellites varies between 17,180 and 26,020 km, making these satellites very suitable for the verification of the effects emerging from general relativity. We employ the post-Newtonian parameterization (PPN) for describing the perturbations acting on Keplerian orbit parameters of artificial Earth satellites caused by the Schwarzschild, Lense–Thirring, and de Sitter general relativity effects. The values emerging from PPN numerical simulations are compared with the approximations based on the Gaussian perturbations for the temporal variations of the Keplerian elements of Galileo satellites in nominal, near-circular orbits, as well as in the highly elliptical orbits. We discuss what kinds of perturbations are detectable using the current accuracy of precise orbit determination of artificial Earth satellites, including the expected secular and periodic variations, as well as the constant offsets of Keplerian parameters. We found that not only secular but also periodic variations of orbit parameters caused by general relativity effects exceed the value of 1 cm within 24 h; thus, they should be fully detectable using the current GNSS precise orbit determination methods. Many of the 1-PPN effects are detectable using the Galileo satellite system, but the Lense–Thirring effect is not.

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