Results 261 to 270 of about 41,651 (296)
Some of the next articles are maybe not open access.
Precise radio astrometry and new developments for the next generation of instruments
Astronomy and Astrophysics Review, 2020We present a technique-led review of the progression of precise radio astrometry, from the first demonstrations, half a century ago, until to date and into the future.
María J Rioja, Richard Dodson
exaly +2 more sources
EAS Publications Series, 2002
The successful hipparcos mission has brought, and proved the validity of, a new observational concept to achieve absolute measurements of star positions in space. Only five years after the final publication of the results there are now four astrometry missions scheduled for the next decade, three of which appearing as the natural ...
S. Roeser, F. Mignard
openaire +2 more sources
The successful hipparcos mission has brought, and proved the validity of, a new observational concept to achieve absolute measurements of star positions in space. Only five years after the final publication of the results there are now four astrometry missions scheduled for the next decade, three of which appearing as the natural ...
S. Roeser, F. Mignard
openaire +2 more sources
Dark matter astrometry at underground detectors with multiscatter events [PDF]
Physical Review D, 2019 We show that current and imminent underground detectors are capable of precision astrometry of dark matter. First we show that galactic dark matter velocity distributions can be obtained from reconstructed tracks of dark matter scattering on multiple ...
Nirmal Raj, Joseph Bramante
exaly +2 more sources
Photographic Astrometry (Astrometrie Photographique)
1991Despite some much publicized disappointments, the highlights of Astrometry during the past three year period are dominated by the successful launches of the ESA Hipparcos astrometric satellite and the NASA Hubble Space Telescope. For the past 15 to 20 years the research activities of many Commission members have been monopolized by the design and ...
openaire +2 more sources
Astronomy Reports, 2018
It has recently become clear that the potential role of astrometry in cosmological studies has been underestimated. Some areas of cosmology that should be investigated using astrometrical methods are discussed. This paper is based on a presentation made at the conference “Modern Astrometry 2017,” dedicated to the memory of K.V.
T. A. Kalinina +3 more
openaire +2 more sources
It has recently become clear that the potential role of astrometry in cosmological studies has been underestimated. Some areas of cosmology that should be investigated using astrometrical methods are discussed. This paper is based on a presentation made at the conference “Modern Astrometry 2017,” dedicated to the memory of K.V.
T. A. Kalinina +3 more
openaire +2 more sources
Astrometry and Cosmology [PDF]
, 1974 For reference purposes, the earth’s surface at sea level may be represented by revolving an ellipse of eccentricity, e, and major axis, a e, about the polar axis. The flattening factor, f, or ellipticity, is related to the eccentricity, e,by the equation $${e^2} = 2f - {f^2}$$ (5-1) , The flattening factor is alternatively called the ...
openaire +1 more source
Astronomical Applications of Astrometry: The Hipparcos and Tycho Catalogues
, 2008This chapter describes various aspects of the Hipparcos and Tycho Catalogues useful for understanding the scientific exploitation considered in subsequent chapters.
M. Perryman
semanticscholar +1 more source
1995
What is Astrometry? What are its objectives and its place in astronomy? By what means these goals are achieved? These are the questions that we are answering in this chapter before entering into the detailed description of the basic techniques of astrometry.
openaire +2 more sources
What is Astrometry? What are its objectives and its place in astronomy? By what means these goals are achieved? These are the questions that we are answering in this chapter before entering into the detailed description of the basic techniques of astrometry.
openaire +2 more sources
The Physics Teacher, 2021
A question for science teachers during the pandemic is: how do we actively engage students in science, given that in-person instruction will be limited at best? One lesson I use for my solar system course involves naked-eye observations of positions of celestial objects. Such activities train students to take careful measurements, keep detailed records,
openaire +2 more sources
A question for science teachers during the pandemic is: how do we actively engage students in science, given that in-person instruction will be limited at best? One lesson I use for my solar system course involves naked-eye observations of positions of celestial objects. Such activities train students to take careful measurements, keep detailed records,
openaire +2 more sources
1995
In Sect. 1.2, various objectives of astrometry were presented. Then, in subsequent chapters, the most effective Earth-based and space astrometric instruments in use were described. The question which now arises is: to what extent do they fulfil the above goals and what are the astronomical and astrophysical problems that require further advances in ...
openaire +2 more sources
In Sect. 1.2, various objectives of astrometry were presented. Then, in subsequent chapters, the most effective Earth-based and space astrometric instruments in use were described. The question which now arises is: to what extent do they fulfil the above goals and what are the astronomical and astrophysical problems that require further advances in ...
openaire +2 more sources