Showing papers by "European Space Operations Centre published in 1999"
TL;DR: In this article, the motion of a particle under the gravitational field of a massive straight segment is considered, and several families of periodic orbits and bifurcations are found.
Abstract: In this paper, we consider the motion of a particle under the gravitational field of a massive straight segment This model is used as an approximation to the gravitational field of irregular shaped bodies, such as asteroids, comet nuclei and planets’s moons. For this potential, we find several families of periodic orbits and bifurcations.
60 citations
TL;DR: The millennium's last solar eclipse was observed on August 11, 1999, over most of Europe, along the northeast coast of North America, and in the Near East and Middle East.
Abstract: The millennium's last solar eclipse was observed on August 11, 1999, over most of Europe, along the northeast coast of North America, and in the Near East and Middle East The eclipse was also observed by the global navigation satellite systems (GNSS), the Global Positioning System (GPS), and the Russian GNSS (GLONASS), because the transmitted signals can be used to infer the total electron content of the ionosphere
Disruption of photoionization and thermospheric heating leads to numerous complex phenomena in the ionosphere Because of the supersonic speed of the Moon's cool shadow in the atmosphere, atmospheric gravity waves may be generated; these propagate upward and trace as traveling ionosphere disturbances in the ionosphere [Chimonas and Hines, 1970] Analogous to the atmospheric pressure on the Earth's surface, total electron content (TEC) can be understood as the “pressure” of the electron gas of the ionosphere, which will decrease with reduced energy input
15 citations
TL;DR: In this article, the situation in the geostationary ring is analyzed based on orbital data in the DISCOS database, and it is shown that only one third of the aging satellites follow this IADC rule.
Abstract: Since more than 20 years reorbiting of geostationary satellites at the end of their mission is recommended and partially performed to protect the GEO environment. Now a worldwide accepted reorbiting altitude was defined by the Inter-Agency Space Debris Coordination Committee (IADC). Still only one-third of the aging satellites follow this IADC rule. Based on orbital data in the DISCOS database, the situation in the geostationary ring is analyzed. From 878 known objects, 305 are controlled inside their longitude slots, 353 are drifting above, below or through GEO, and 125 are in a libration orbit (status of January 2001). In the last four years (1997–2000) 58 spacecraft reached end-of-life. Twenty of them were reorbited in compliance with the IADC recommendations, 16 were reorbited below this recommendation and 22 were abandoned without any end-of-life disposal manoeuvre.
12 citations
TL;DR: A 24 hour snapshot was taken of the existing space debris population in a predefined space volume, and cataloged objects and unknown space debris as well as two subpopulations generated from leaking RORSAT reactor cores and from a Pegasus upper stage explosion were detected.
12 citations
TL;DR: In this paper, the authors outline the orbit determination and associated activities planned at ESOC in the scope of flight dynamics support of the ESA Envisat mission and develop the NAvigation Package for Earth Observation Satellites (NAPEOS).
8 citations
TL;DR: The paper will present the strategy used to obtain the best estimated trajectories, the problems found during the analysis of the data and the results obtained, including comparisons with trajectories obtained using other tracking systems or algorithms.
3 citations
TL;DR: In this paper, the authors reviewed the impact probability of the Leonid meteor storms of 1965 and 1966 and found that there is, in fact, very little evidence to support such claims.
3 citations