Results 21 to 30 of about 951 (180)
Astrometry in the Future [PDF]
CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY, 1997 AbstractThe introduction of the extragalactic reference frame and the availability of the Hipparcos and Tycho catalogs will have major impacts on changing the accuracy levels of astrometry in the future.There is a need for accurate densification of the reference frames down to at least 20thmagnitude.
openaire +1 more source
Relativity in Astrometry [PDF]
Symposium - International Astronomical Union, 1986 The coordinate dependence of the definition of light deflexion is discussed and the concepts of “natural” and “proper” reference frame are introduced in order to derive astrometric observables from coordinate quantities. Confusion in published formulations of VLBI data analysis is discussed in the context of the IAU definition of the coordinate time ...
openaire +1 more source
The history of astrometry [PDF]
The European Physical Journal H, 2012 The history of astrometry, the branch of astronomy dealing with the positions of celestial objects, is a lengthy and complex chronicle, having its origins in the earliest records of astronomical observations more than two thousand years ago, and extending to the high accuracy observations being made from space today.
openaire +2 more sources
Observational data and orbits of the asteroids discovered at the Baldone Observatory in 2015–2018
Open Astronomy, 2020 This paper is devoted to the discovery of 37 asteroids at the Baldone Astrophysical Observatory (MPC 069) from 2015 to 2018, and one of dynamically interesting Mars-crosser (MC) observed at the Baldone Astrophysical Observatory, namely 2008 LX16.
Wlodarczyk Ireneusz +2 more
doaj +1 more source
Aerospace, 2022 Space Surveillance and Tracking is a task that requires the development of systems that can accurately discriminate between natural and man-made objects that orbit around Earth.
Florin Dumitrescu +4 more
doaj +1 more source
SST Anywhere—A Portable Solution for Wide Field Low Earth Orbit Surveillance
Remote Sensing, 2022 The low-Earth orbit (LEO) is filled with active satellites, but also with space debris, which need constant observation. The orbiting objects may be affected by collisions or by atmospheric drag, and therefore they can change their orbit or even fall to ...
Radu Gabriel Danescu +4 more
doaj +1 more source
Photographic zenith tubes observations to improve HIPPARCOS proper motion in declination of some stars [PDF]
Serbian Astronomical Journal, 2005 A procedure of calculation and results of an attempt to improve proper motions in declination for some HIPPARCOS stars are presented. A long series of optical observations of these stars observed with Photographic Zenith Tubes (PZT) are used.
Damljanović Goran M.
doaj +1 more source
Digitization of the Belgrade Astronomical Observatory's vertical circle observational heritage [PDF]
Serbian Astronomical Journal, 2018 The aim of the paper is to present the digitization of the results of last observations of bright stars made by the Belgrade vertical circle ASKANIA N±80118 (D = 190 mm, f = 2578 mm) at the Astronomical Observatory of Belgrade.
Šegan S., Šegan-Radonjić M.
doaj +1 more source
Macho Photometry and Astrometry [PDF]
Symposium - International Astronomical Union, 1995 MACHOs (Massive Astrophysical Compact Halo Objects) have been discovered by their relativistic amplification of light from distant stars as they crossed very near to the line-of-sight. The very few events were detected from more than a billion photometric measurements of millions of stars in the LMC.
Høg, E. +2 more
openaire +2 more sources
Il Nuovo Cimento B, 2005 General relativistic effects in astrophyiscal systems have been detected thanks to accurate astrometric measurements. We outline some keystones of astrometry such as stellar aberration (argument development during the years 1727-1872); Mercury's perihelion precession (1845-1916); solar disk oblateness (1966-2001); relativistic light deflection (1916 ...
openaire +2 more sources