Study of a population of space debris objects with a high area-to-mass ratio in high Earth orbits

2020 ◽  
Author(s):  
V.M. Agapov ◽  
I.E. Molotov ◽  
G.K. Borovin ◽  
A.I. Streltsov
Keyword(s):  
Space Debris ◽  
Orbital Motion ◽  
Center Of Mass ◽  
Light Curves ◽  
Mass Ratio ◽  
High Area ◽  
Motion Parameters ◽  
High Earth Orbits ◽  
Earth Orbits

The data on 498 space debris objects with a high area-to-mass ratio (HAMR) detected in 2016–2017 were analyzed to identify possible candidates for the role of "parent objects". As a result, the origin of several HAMR fragments was determined. These fragments separated from three different large objects in the geostationary orbit (GEO) region, including two functioning spacecraft and one rocket launcher stage. Observations of these three objects showed that there were no noticeable differences in their light curves, which indicates the absence of significant changes in the geometric shape, reflective characteristics and motion parameters relative to the center of mass. At least, both spacecraft continued to perform retention maneuvers in their positions on the GEO, and no unpredictable changes were detected in the orbital motion and in the stage light curve. Therefore, the formation of newly discovered fragments cannot be associated with the catastrophic destruction of the “parent objects”.

scholarly journals Strangeness of translational and rotational motion of the geosynchronous object 10294 according to optical observations

2021 ◽  
pp. 33-37
Author(s):  
Н.С. Бахтигараев
Keyword(s):  
Rotational Motion ◽  
Space Debris ◽  
Abrupt Change ◽  
Libration Point ◽  
Light Curves ◽  
Optical Observations ◽  
Characteristic Change ◽  
Mass Ratio ◽  
Stable Orbit ◽  
The Republic

Представлены особенности изменения параметров движения геосинхронного объекта 10294 SIRIO-1 №1977-080A по результатам оптических наблюдений в обсерваториях в Звенигороде, на пике Терскол и на горе Санглох республики Таджикистан. Пассивный итальянский научный космический аппарат SIRIO-1 представляет интерес тем, что он описывает классическую восьмерку вокруг точки либрации 75 ◦ в.д. без дрейфа по долготе и всегда доступен наблюдениям с наших пунктов. Это дает возможность детально исследовать поступательно-вращательное движение объекта, используя только результаты своих измерений. SIRIO-1 наблюдался нами для проверки аппаратуры и программного обеспечения как тестовый объект с очень устойчивой орбитой. В 2018 г. у этого объекта были обнаружены изменения в движении и в кривых блеска, не свойственные космическому мусору. Были зафиксированы небольшое скачкообразное изменение орбиты между 7 и 11 марта 2018 г. и изменение коэффициента отношения площади миделевого сечения объекта к его массе; кроме того перестал надежно определяться период изменения блеска и появилось характерное изменение блеска на одном и том же участке траектории с периодом, примерно равным звездным суткам. The features of changes in the motion parameters of the geosynchronous object 10294 SIRIO-1 No.1977-080A based on the results of optical observations at the observatories in Zvenigorod, Terskol Peak and Sanglokh Mountain in the Republic of Tajikistan are presented. The passive Italian scientific spacecraft SIRIO-1 is of interest to us because it describes the classic eight around the libration point of 75 ◦ E without longitude drift and is always available to observations from our observation points. This makes it possible to study in detail the translational-rotational motion of the object, using only the results of their measurements. SIRIO-1 was observed by us to test the hardware and software as a test object with a very stable orbit. In 2018, this object was found to have changes in motion and in the light curves that are not characteristic to space debris. A small abrupt change in the orbit between March 7 and 11, 2018, and a change in the area-to-mass ratio of the object were recorded. In addition, the period of change in the brightness was no longer reliably determined, and a characteristic change in the brightness appeared on the same part of the trajectory with a period approximately equal to the sidereal day.

Properties of the high area-to-mass ratio space debris population at high altitudes

2008 ◽  
Vol 41 (7) ◽  
pp. 1039-1045 ◽  
Author(s):  
T. Schildknecht ◽  
R. Musci ◽  
T. Flohrer
Keyword(s):  
Space Debris ◽  
Mass Ratio ◽  
High Altitudes ◽  
High Area

Exploring Baryon Rich Matter with Heavy-Ion Collisions

2019 ◽  
Vol 64 (7) ◽  
pp. 583 ◽  
Author(s):  
S. Harabasz
Keyword(s):  
Center Of Mass ◽  
Heavy Ion ◽  
State Density ◽  
Heavy Nuclei ◽  
First Order ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Deconfinement Phase Transition ◽  
Ground State Density

Collisions of heavy nuclei at (ultra-)relativistic energies provide a fascinating opportunity to re-create various forms of matter in the laboratory. For a short extent of time (10-22 s), matter under extreme conditions of temperature and density can exist. In dedicated experiments, one explores the microscopic structure of strongly interacting matter and its phase diagram. In heavy-ion reactions at SIS18 collision energies, matter is substantially compressed (2–3 times ground-state density), while moderate temperatures are reached (T < 70 MeV). The conditions closely resemble those that prevail, e.g., in neutron star mergers. Matter under such conditions is currently being studied at the High Acceptance DiElecton Spectrometer (HADES). Important topics of the research program are the mechanisms of strangeness production, the emissivity of matter, and the role of baryonic resonances herein. In this contribution, we will focus on the important experimental results obtained by HADES in Au+Au collisions at 2.4 GeV center-of-mass energy. We will also present perspectives for future experiments with HADES and CBM at SIS100, where higher beam energies and intensities will allow for the studies of the first-order deconfinement phase transition and its critical endpoint.

The role of science in the study of and response to space threats

2019 ◽  
Vol 89 (8) ◽  
pp. 777-799
Author(s):  
B. M. Shustov
Keyword(s):  
Comparative Analysis ◽  
20Th Century ◽  
21St Century ◽  
Space Debris ◽  
The Sun ◽  
National Program ◽  
Biological Hazard ◽  
Academy Of Sciences ◽  
Space Activities

During the second half of the 20th century and the beginning of the 21st century, space hazards multiplied, the most urgent of which is space debris. Professionals working in space are exposed to this hazard daily and are aware of it as a problem. Furthermore, increasing attention is being paid to the unpredictable behavior of the Sun, which produces the so-called space weather. The asteroid-comet hazard is considered as potentially having the most catastrophic consequences. No manifestations of biological hazard have yet been observed, although as space activities develop, it is becoming increasingly important. The appropriate time scale for astrophysical hazards is many millions of years, so from a practical perspective, they have no importance. This article briefly describes the main types of space hazards. The author analyzes the results of research and practical work in the field, both worldwide and specifically in Russia. Comparative analysis leads to the clear conclusion that a national program must be developed for the study of space hazards and to respond to space threats. This article is based on a report made by the author at the meeting of the Presidium of the Russian Academy of Sciences (RAS) on January 15, 2019.

Sign in / Sign up

Export Citation Format

Share Document