scholarly journals First Results of the VLBI Experiment on Radar Location of the Asteroid 2012 DA14

2013 ◽  
Vol 22 (4) ◽  
Author(s):  
M. Nechaeva ◽  
A. Antipenko ◽  
D. Bezrukov ◽  
Vl. Bezrukovs ◽  
A. Dementjev ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Rotation Period ◽  
Radio Telescopes ◽  
Radiophysical Research Institute ◽  
Orbital Parameters ◽  
First Results ◽  
Radio Location ◽  
Research Institute

AbstractAn international VLBI experiment on radio location of the asteroid 2012 DA14 was organized on 2013 February 15–16, during its flyby close to Earth. The purpose of observations was to investigate and specify orbital parameters of the asteroid, as well as to evaluate its rotation period and other characteristics. The irradiation of the asteroid was performed by the RT-70 transmitter at Evpatoria (Crimea, Ukraine), while the reflected signals were successfully accepted by the two 32 m radio telescopes at Medicina (Bologna, Italy) and Irbene (Ventspils, Latvia). Processing and interpretation of the data were performed both in the Radiophysical Research Institute at Nizhny Novgorod and in the Ventspils International Radio Astronomy Center. The first results of this experiment are presented and discussed.

An Experiment on Radio Location of Objects in the Near-Earth Space with VLBI in 2012

2013 ◽  
Vol 22 (1) ◽  
Author(s):  
M. Nechaeva ◽  
A. Antipenko ◽  
V. Bezrukovs ◽  
D. Bezrukov ◽  
A. Dementjev ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Space Debris ◽  
Rotation Period ◽  
Doppler Frequency ◽  
Radio Telescopes ◽  
Frequency Shifts ◽  
Near Earth Space ◽  
Vlbi Data ◽  
Doppler Frequency Shifts ◽  
Radio Location

AbstractAn experiment on radar location of space debris objects using of the method of VLBI was carried out in April, 2012. The radar VLBI experiment consisted in irradiation of some space debris objects (4 rocket stages and 5 inactive satellites) with a signal of the transmitter with RT-70 in Evpatoria, Ukraine. Reflected signals were received by a complex of radio telescopes in the VLBI mode. The following VLBI stations took part in the observations: Ventspils (RT-32), Urumqi (RT-25), Medicina (RT-32) and Simeiz (RT-22). The experiment included measurements of the Doppler frequency shift and the delay for orbit refining, and measurements of the rotation period and sizes of objects by the amplitudes of output interferometer signals. The cross-correlation of VLBI-data is performed at a correlator NIRFI-4 of Radiophysical Research Institute (Nizhny Novgorod). Preliminary data processing resulted in the series of Doppler frequency shifts, which comprised the information on radial velocities of the objects. Some results of the experiment are presented.

scholarly journals Steps to Establish International Radio Quiet Zones

2001 ◽  
Vol 196 ◽  
pp. 271-271
Author(s):  
Harvey Butcher
Keyword(s):  
Radio Astronomy ◽  
Working Group ◽  
Economic Cooperation ◽  
Radio Spectrum ◽  
Spectral Lines ◽  
Radio Telescopes ◽  
The Future ◽  
International Regulations ◽  
First Results

Future radio telescopes will feature large increases in sensitivity, not only to celestial sources but also to man-made interference. In addition, they will need to measure spectral lines as a function of redshift and hence observe at arbitrary frequencies. Current international regulations governing the use of the radio spectrum are in principle inappropriate to these science-driven needs. There are still a few places on Earth that are relatively interference-free, but the coming generation of telecommunications satellites in low orbit will compromise even those sites. The Organization for Economic Cooperation and Development (OECD) has recently sponsored a working group on the future of radio astronomy, which recommended that the possibility of establishing one or more formally recognized International Radio Quiet Zones (IRQZ) be studied seriously. First results of that effort will be discussed.

scholarly journals Protecting Space-Based Radio Astronomy

2001 ◽  
Vol 196 ◽  
pp. 324-334 ◽  
Author(s):  
V. Altunin
Keyword(s):  
Radio Frequency ◽  
Radio Astronomy ◽  
Low Frequency ◽  
Radio Frequency Interference ◽  
Lagrangian Point ◽  
Radio Telescopes ◽  
The Moon ◽  
Microwave Background ◽  
Distant Future ◽  
First Results

This paper outlines some of the radio frequency interference issues related to radio astronomy performed with space-based radio telescopes. Radio frequency interference that threatens radio astronomy observations from the surface of Earth will also degrade observations with space-based radio telescopes. However, any resulting interference could be different than for ground-based telescopes due to several factors. Space radio astronomy observations significantly enhance studies in different areas of astronomy. Several space radio astronomy experiments for studies in low-frequency radio astronomy, space VLBI, the cosmic microwave background and the submillimetre wavelengths have flown already. The first results from these missions have provided significant breakthroughs in our understanding of the nature of celestial radio radiation. Radio astronomers plan to deploy more radio telescopes in Earth orbit, in the vicinity of the L2 Sun-Earth Lagrangian point, and, in the more distant future, in the shielded zone of the Moon.

The 6th conference "Baltic Applied Astroinformatics and Space Data Processing" (BAASP 2019) dedicated to the 25th anniversary of the VIRAC

2020 ◽  
pp. 1-6
Author(s):  
V BEZRUKOVS ◽  
RP PAULIKS
Keyword(s):  
Applied Sciences ◽  
Data Processing ◽  
Radio Astronomy ◽  
25Th Anniversary ◽  
Engineering Research ◽  
University Of Applied Sciences ◽  
Space Data ◽  
Research Institute

The Engineering Research Institute "Ventspils International Radio Astronomy Centre" of Ventspils University of Applied Sciences (ERI VIRAC of VUAS) founded in 1994, celebrated its 25th anniversary in 2019. One of the main events dedicated to this date was the conference "The 6th Baltic Applied Astroinformatics and Space Data Processing" (BAASP 2019) held in Ventspils from 21 to 23 August 2019.

scholarly journals Small Radio Telescopes for Education

2001 ◽  
Vol 24 (3) ◽  
pp. 307-311
Author(s):  
Koitiro Maeda ◽  
Noritaka Tokimasa
Keyword(s):  
Radio Astronomy ◽  
Solar Flares ◽  
Physics Education ◽  
Radio Telescopes ◽  
Fluorescent Lamp ◽  
Astronomy Education ◽  
Quiet Sun

AbstractWe present small radio telescopes consisting of commercial instruments for satellite TV reception. With these radio telescopes we can observe the 12 GHz emissions from the quiet sun and solar flares. Since microwaves occurring in our environment, e.g., those from a building and a fluorescent lamp, are also detectable, such radio telescopes are useful not only for radio astronomy education but also for physics education.

Long term 6.7 GHz methanol maser monitoring program

2017 ◽  
Vol 13 (S336) ◽  
pp. 277-278
Author(s):  
Artis Aberfelds ◽  
Ivar Shmeld ◽  
Karlis Berzins
Keyword(s):  
Radio Astronomy ◽  
Monitoring Program ◽  
Radio Telescopes ◽  
Methanol Maser ◽  
Data Registration ◽  
Methanol Masers ◽  
Maser Sources

AbstractThe first long-term maser (mainly methanol) monitoring program is under way with the radio telescopes of Ventspils International Radio Astronomy Center. The first activity of this program was to develop an observations methodology and data registration and reduction software for the Ventspils telescopes. The developed routines are to be used for maser variability monitoring, investigating short bursts of intensity and a search for new, previously unknown, maser sources. Currently the program consists of 41 methanol masers observed at 6.7 GHz, while new ones are periodically added. The maser sources are observed at 3 – 5 day intervals. It was found that most the sources display a significant level of variability with time, ranging from a few days, up to several months and, perhaps, years. In addition to non-varying masers, several types of maser variability behavior were observed, including: monotonic increases or decreases, un-periodical, quasi-periodic and periodic variations.

scholarly journals Traces of the formation history of the Milky Way

2013 ◽  
Vol 9 (S298) ◽  
pp. 430-430
Author(s):  
B. Nordström ◽  
E. Stonkutė ◽  
R. Ženovienė ◽  
G. Tautvaišienė
Keyword(s):  
Milky Way ◽  
Orbital Parameters ◽  
Element Abundances ◽  
Elemental Abundances ◽  
Formation History ◽  
First Results ◽  
History Of ◽  
R Process ◽  
Process Element ◽  
Kinematic Properties

AbstractChemical and kinematical information is needed in order to understand and trace the formation history of our Galaxy. In the homogeneous large sample of F and G stars in the survey by Nordström et al. (2004), groups of stars with orbital parameters different from field stars were found by Helmi et al. (2006). Simulations of disrupted satellites showed that the groups had similar properties as infalling dwarf satellites would have after several Gyr. From high resolution spectra, we analyse elemental abundances of stars in 3 such groups with conserved kinematic properties. Here we present first results of s- and r- process element abundances in two such groups and compare with average field stars.

scholarly journals On dynamo action in the giant star Pollux: first results

2013 ◽  
Vol 9 (S302) ◽  
pp. 363-364 ◽  
Author(s):  
Ana Palacios ◽  
Allan Sacha Brun
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Intensity ◽  
Rotation Period ◽  
Dynamo Action ◽  
Convective Envelope ◽  
Giant Star ◽  
First Results ◽  
The One ◽  
3D Mhd Simulation ◽  
The Magnetic Field

AbstractWe present preliminary results of a 3D MHD simulation of the convective envelope of the giant star Pollux for which the rotation period and the magnetic field intensity have been measured from spectroscopic and spectropolarimetric observations. This giant is one of the first single giants with a detected magnetic field, and the one with the weakest field so far. Our aim is to understand the development and the action of the dynamo in its extended convective envelope.

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