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Tesi sul tema "Astrometric"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 10 marzo 2023

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1

O'Mullane, William. "Implementing the Gaia Astrometric Solution." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/83861.

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Abstract (sommario):
As is the way with books in general this document is presented in the form of chapters (seven in number) devoted to individual topics relating to the overall topic of Gaia astrometric data processing. We progress logically from the satellite to the equations for the astrometry to the implementation of a software system to process Gaia observations. After this we look at a few key astrophysical issues for Gaia and explain tests which have been carried out, using the implementation, concerning these effects. A few appendices provide additional information. Here an overview paragraph is pro
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2

Bauer, Christina, of Western Sydney Nepean University, and Faculty of Science and Technology. "Astrometric observations of wide southern double stars." THESIS_FST_XXX_Bauer_C.xml, 1995. http://handle.uws.edu.au:8081/1959.7/251.

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Observations were made of 309 binary systems between RA 17h - 07h and Dec -70 degrees to -60 degrees. The images were calibrated against pairs measured for CCD astometry. Measurements were made of separations, position angles and differential magnitudes. Uncertainties in position angle and separation were 7.8o/p and 0.16 arcseconds respectively. The position angles, separations and differential V magnitudes were compared with WDS figures. It was determined that only 29% _+ 5% of the observed pairs had undergone significant movement since the last previous measurement, which agrees with the res
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3

Bauer, Christina. "Astrometric observations of wide southern double stars." Thesis, View thesis, 1995. http://handle.uws.edu.au:8081/1959.7/251.

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Abstract (sommario):
Observations were made of 309 binary systems between RA 17h - 07h and Dec -70 degrees to -60 degrees. The images were calibrated against pairs measured for CCD astometry. Measurements were made of separations, position angles and differential magnitudes. Uncertainties in position angle and separation were 7.8o/p and 0.16 arcseconds respectively. The position angles, separations and differential V magnitudes were compared with WDS figures. It was determined that only 29% _+ 5% of the observed pairs had undergone significant movement since the last previous measurement, which agrees with the res
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4

Bauer, Christina. "Astrometric observations of wide southern double stars /." View thesis, 1995. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030827.113613/index.html.

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5

Pasquato, Ester. "Effects of stellar surface inhomogeneities on astrometric accuracy." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209872.

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Surface brightness asymmetries are a very common feature of stars. Among other effects they cause a difference between the projected centre of mass and the photocentre. The evolution of those surface features makes this difference time-dependent. In some cases the displacement can be a non-negligible fraction of the star radius R, and if R>1 AU, of the parallax. We investigate the impact of surface brightness asymmetries on the Gaia astrometric solution and on the data processing flow. In particular we derive analytical expressions for the change in the derived astrometric parameters for a sin
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6

Andrei, Alexandre Humberto. "Observed and predicted data in radio astrometric observations." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279145.

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7

Colavita, Michael Mark. "Atmospheric limitations of a two-color astrometric interferometer." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15223.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Bibliography: leaves 381-389.<br>by Michael Mark Colavita.<br>Ph.D.
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8

Huang, Chunsheng. "Design and analysis of the Astrometric Telescope Facility." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184994.

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Abstract (sommario):
The Astrometric Telescope Facility (ATF) is designed to be a space-based facility searching for planets and extra solar planetary systems. In order to be able to positively identify other planetary systems such as Uranus/Neptune-class planets, the ATF is required to be capable of surveying approximately 100 stars within about 10 parsecs of the earth, of measuring a change in the relative position of stars to an accuracy of 10 microarcseconds, and of being stable for about 10 to 20 years. The ATF approach to astrometry is to modulate the intensity on the focal plane of the telescope by a moving
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9

Eriksson, Urban. "Stellar Surface Structures and the Astrometric Serach for Exoplnaets." Licentiate thesis, Kristianstad University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235229.

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Abstract (sommario):
Measuring stellar parallax, position and proper motion is the task of astrometry. With the development of new and much more accurate equipment, different noise sources are likely to affect the very precise measurements made with future instruments. Some of these sources are: stellar surface structures, circumstellar discs, multiplicity and weak microlensing. Also exoplanets may act as a source of perturbation. In this thesis I present an investigation of stellar surface structures as a practical limitation to ultra-high-precision astrometry. The expected effects in different regions of the HR-
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10

Brannigan, Emma Leigh. "A spectroscopic and spectro-astrometric study of T Tauri stars." Thesis, University of Hertfordshire, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440155.

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11

Brown, Scott William. "Characterization and mitigation of radiation damage on the Gaia Astrometric Field." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/238290.

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Abstract (sommario):
In November 2012, the European Space Agency (ESA) is planning to launch Gaia, a mission designed to measure with microarcsecond accuracy the astrometric properties of over a billion stars. Microarcsecond astrometry requires extremely accurate positional measurements of individual stellar transits on the focal plane, which can be disrupted by radiation-induced Charge Transfer Inefficiency (CTI). Gaia will suffer radiation damage, impacting on the science performance, which has led to a series of Radiation Campaigns (RCs) being carried out by industry to investigate these issues. The goal of thi
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12

Lew, Alfie Katat 1960. "Astrometric telescope simulator for the design and development of telescope teleoperation." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276844.

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A real-time discrete-event simulation model is built to emulate the functional operations of the Thaw telescope of the Allegheny Observatory and its attached scientific instrument. The OASIS software system is used to communicate with the simulation model. This simulation model, written in Ada, consists of three major parts. The Command Receiver and the Data Transmitter are software written to service the incoming telecommands and outgoing telemetry, the Command Processor is the actual simulator itself consisting of a Command Retriever, a Scanner, a Parser, a Command Interpreter, and the actua
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13

Marcatelli, Camilla. "Astrometric and photometric characterization of the PRISMA fish-eye cameras for meteor observations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15801/.

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The project PRISMA is the first network for systematic surveillance of meteor and atmosphere. More specifically this thesis is about the astrometric and photometric characterization of PRISMA cameras and also the computation of meteoric trajectories. In the first and second chapter there is a general overview of meteor phenomena and a theoric description of meteoroid interaction with the atmosphere. At the beginning of the third chapter there is a description of the project, what it deals with and who partecipates. Then there is the general specification of the Basler camera and the tests that hav
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14

Konopacky, Q. M., C. Marois, B. A. Macintosh, R. Galicher, T. S. Barman, S. A. Metchev, and B. Zuckerman. "ASTROMETRIC MONITORING OF THE HR 8799 PLANETS: ORBIT CONSTRAINTS FROM SELF-CONSISTENT MEASUREMENTS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621227.

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Abstract (sommario):
We present new astrometric measurements from our ongoing monitoring campaign of the HR 8799 directly imaged planetary system. These new data points were obtained with NIRC2 on the W.M. Keck II 10 m telescope between 2009 and 2014. In addition, we present updated astrometry from previously published observations in 2007 and 2008. All data were reduced using the SOSIE algorithm, which accounts for systematic biases present in previously published observations. This allows us to construct a self-consistent data set derived entirely from NIRC2 data alone. From this data set, we detect acceleration
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15

Klüter, Jonas [Verfasser], and Joachim [Akademischer Betreuer] Wambsganß. "On the use of Gaia for astrometric microlensing / Jonas Klüter ; Betreuer: Joachim Wambsganß." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1215576366/34.

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16

Toyozumi, Hiroyuki Physics Faculty of Science UNSW. "The intra-pixel sensitivity variation of a CCD." Awarded by:University of New South Wales. School of Physics, 2005. http://handle.unsw.edu.au/1959.4/25995.

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The effect of Intra-pixel sensitivity variation (IPSV) in charge-coupled devices (CCDs) can be important in astronomical applications. This thesis studies the IPSV in a front-illuminated three-phase EEV05-20 CCD used in the Automated Patrol Telescope (APT), from multiple points of view. To explore the detailed sensitivity variation within pixels, the CCD was scanned using a 4 \mu meter diameter light beam in four colour bands: B, V, R and I. The resulting images clearly show the IPSVs due to the CCD electrode structure, and its dependence on wavelength. Unexpected ghost images appear in the s
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17

Mogren, Karen Nicole. "Analytic Expressions for the Detectability of Exoplanets in Radial Velocity, Astrometric, and Transit Surveys." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338324650.

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18

Dorland, Bryan N. "An astrometric analysis of eta Carinae's eruptive history using HST WF/PC2 and ACS observations." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7220.

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Abstract (sommario):
Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Physics. Title from t.p. of PDF. On t. p. "eta" is a Greek symbol. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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19

Denis, Jean Marc. "Characterization of online archives of astronomical imaging vis-a-vis serendipitous asteroids, and their astrometric properties." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5186.

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Abstract (sommario):
The identification of known asteroids on existing CCD pictures would allow us to obtain accurate astrometric and photometric asteroid properties. Some asteroids might have ambiguous orbital elements, thus their identification along with their exact positions on multiple picture frames could significantly improve their orbital elements. Furthermore, the possibility of identifying known asteroids on older pictures, sometimes preceding their discovery date, might allow the study of non-gravitational effects like the Yarkovsky effect. Identifying a potential Yarkovsky effect on asteroids is cha
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20

Röll, Tristan Alexander [Verfasser], Ralph [Akademischer Betreuer] Neuhäuser, and Thomas [Akademischer Betreuer] Preibisch. "Astrometric search for extrasolar planets in stellar multiple systems / Tristan Alexander Röll. Gutachter: Ralph Neuhäuser ; Thomas Preibisch." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2011. http://d-nb.info/1016683294/34.

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21

Parvex, Pichaida Taky. "Astrometric precision spectroscopy: Experimental development of a dual-frequency laser synthesizer based on an optical frequency comb." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/159288.

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Ingeniero Civil Eléctrico<br>La tecnología de terahercios se encuentra en un estado de desarrollo atrasado con respecto a las tecnologías usadas en las bandas adyacentes, como la óptica infrarroja o la electróni- ca de microondas. En particular, no se poseen fuentes compactas de radiación que operen dentro esta banda logrando buenos niveles de potencia y amplios rangos de frecuencia. Las útiles propiedades de la radiación de terahercios como su capacidad de detectar moléculas complejas, buena resolución espacial y ser radiación no ionizante, hacen que el desarrollo de tecnología para est
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22

Green, Daniel W. E. "Assessment of early-modern observations of comets and supernovae : focus on pre-telescopic European astrometric and physical data." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3053/.

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The two-century period prior to the publication of Newton's Principia (first edition 1687; third edition 1726) was most important in terms of the radical changes that occurred in the observation, perception, and understanding of celestial objects that in turn spurred Newton to deduce his laws of gravitation and motion. Surprisingly, much of the available observational data embedded in contemporary texts from that two-century period has remained unused by modern astronomers, and this thesis (a) describes large amounts of data that were found and reanalyzed during the course of this Ph.D. resear
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23

Proft, Svea [Verfasser], and Joachim [Akademischer Betreuer] Wambsganß. "On the Exploration of Quasars and the Astrometric Microlensing Effect with the Gaia Satellite / Svea Proft ; Betreuer: Joachim Wambsganß." Heidelberg : Universitätsbibliothek Heidelberg, 2016. http://d-nb.info/1180615689/34.

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24

Richardson, Matthew. "Mass Estimation through Fusion of Astrometric and Photometric Data Collection with Application to High Area-to-Mass Ratio Objects." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1742.

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This thesis work presents the formulation for a tool developed in MATLAB to determine the mass of a space object from the fusion of astrometric and photometric data. The application for such a tool is to better model the mass estimation method used for high area-to-mass ratio objects found in high altitude orbit regimes. Typically, the effect of solar radiation pressure is examined with angles observations to deduce area-to-mass ratio calculations for space objects since the area-to-mass ratio can greatly affect its orbital dynamics. On the other hand, photometric data is not sensitive to mass
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25

Xi, Xiaojin. "Analytical representation for ephemeris with short time-span : application to the longitude of Titan." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO015/document.

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Abstract (sommario):
Les éphémérides issues d'intégrations numériques qui peuvent être facilement téléchargées des sites de l'IMCCE ou du JPL, ont une très bonne précision pour les observations récentes. En même temps, un autre type d'éphémérides, celles analytiques comme TASS, décrivent en détail le système dynamique par une représentation en combinaison de fréquences propres. Notre but est d'associer ces deux types d'éphémérides pour l'utiliser dans les études de la rotation des satellites naturelles. Cela signifie qu'il faut reconstruire des éphémérides à long terme et de haute précision montrant les caractéris
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26

Mor, Crespo Roger. "The star formation history and the stellar initial mass function of the Milky Way disc. The population synthesis Besançon Galaxy Model in the Gaia era." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667482.

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AIMS: We develop a new theoretical framework to generate Besançon Galaxy Model Fast Approximate Simulations (BGM FASt) to address fundamental questions of the Galactic structure and evolution performing multi-parameter inference. The flexibility of BGM FASt allows the inference of fundamental parameters related to the stellar initial mass function (IMF), the star formation history (SFH), the density distribution, the kinematics and the chemo-dynamics, among others. BGM FASt allows the study of different Milky Way (MW) components. In this thesis we are focused in a first application of our
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27

Dominis, Dijana. "The role of binary stars in searches for extrasolar planets by microlensing and astrometry." Phd thesis, Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2006/1081/.

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28

Honková, Michaela. "Numerical Methods of Image Analysis in Astrometry." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-375536.

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Velmi přesná následná astrometrie je nezbytným předpokladem sledování blízkozemních objektů, které mohou představovat riziko srážky se Zemí. Tato práce přináší ucelený přehled přesné astrometrie, obsahuje potřebnou matematickou teorii, postup předzpracování snímků v astronomii, a nastiňuje použití filtrů. Navrhuje nové metody pro vyrovnání pozadí snímků před provedením astrometrického měření pro případ, kdy nejsou dostupné kalibrační snímky. Tyto metody jsou založeny na vytvoření syntetického flatfieldu pomocí aplikování filtru na snímek a následné užití tohoto flatfieldu pro odstranění pozadí
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29

Langhans, Ralf. "Automatisierte universelle CCD-Astrometrie von Kleinplaneten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1120649880132-10813.

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Nowadays, CCD observations are widely used to determine astrometric positions of minor planets differentially. Especially, follow-up observational programs require to produce and analyse a large number of CCD frames. This dissertation discusses the methods which are used to process such astrometrical CCD frames and extract scientific information from them. These methods are then combined into a complete astrometric software package. Among all corrections which have to be taken into consideration, special attention is given to the effects of differential chromatic refraction (DCR). It is demons
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30

Castro, Ginard Alfred. "Detection, characterisation and use of open clusters in a Galactic context in a Big Data environment." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/671790.

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Open clusters are groups of stars, gravitationally bound together, that were born from the same molecular cloud and, thus, share similar positions, kinematics, ages and metallicities. Traditional methods to detect open clusters rely in the visual inspection of regions of the sky to look for positional overdensities of stars, which then are checked to follow an isochrone pattern in a colour-magnitude diagram. The publication of the second Gaia data release, with more than 1.3 billion stars with parallax and proper motion measurements together with mean photometry in three broadbands, boosted t
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31

Perez-Torres, Miguel ©¹ngel. "Radioemision dy supernovas y astrometria de alta precision = radio emission from supernovae and high precision astrometry / memoria presentada por Miguel Angel Perez Torres." Link to ADS abstract, 1999. http://adsabs.harvard.edu//abs/1999PhDT........11P.

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32

Zschocke, Sven. "Light propagation in the Solar System for astrometry on sub-micro-arcsecond level." Cambridge University Press, 2018. https://tud.qucosa.de/id/qucosa%3A38698.

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We report on recent advancement in the theory of light propagation in the Solar System aiming at sub-micro-arcsecond level of accuracy: (1) A solution for the light ray in 1.5PN approximation has been obtained in the field of N arbitrarily moving bodies of arbitrary shape, inner structure, oscillations, and rotational motion. (2) A solution for the light ray in 2PN approximation has been obtained in the field of one arbitrarily moving pointlike body.
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33

IOVENITTI, SIMONE. "ASTROMETRY TECHNIQUES FOR THE CALIBRATION OF THE ASTRI TELESCOPE WITH THE VARIANCE METHOD." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/914143.

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In the study of Very High-Energy (VHE) astrophysical phenomena the next generation of Imaging Atmospheric Cherenkov Telescopes (IACT) will play a key role thanks to specific ground-based astronomical observations. In this context, the ASTRI project developed a novel instrument endowed with a Schwarzschild-Couder dual-mirror optical configuration (that has never been adopted before in gamma-ray astronomy) and a dedicated Cherenkov camera entirely designed by the Istituto Nazionale di Astrofisica (INAF) based on SiPM sensors. The prototype telescope ASTRI– Horn is located in Italy and carried ou
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34

Mignard, François, and Sergei Klioner. "Gaia DR1 compared to VLBI positions." Cambridge University Press, 2017. https://tud.qucosa.de/id/qucosa%3A70690.

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35

Berthier, Jérôme. "Astrometrie des occultations d'etoiles par les asteroides." Observatoire de Paris, 1997. https://tel.archives-ouvertes.fr/tel-00011923.

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L'etude presentee ici concerne la prediction et l'observation des occultations d'etoiles par les asteroides. Le sujet traite comprend la modelisation et le developpement d'algorithmes de predictions des occultations stellaires completes par l'amelioration de leur precision a travers des considerations theoriques et observationnelles. Pour cela je developpe dans un premier temps toutes les definitions relatives aux ephemerides en m'attachant plus particulierement aux notions de reperes et systemes de references celestes et terrestres. Je presente ensuite les differentes echelles de temps s'y ra
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36

Belikov, Andrew. "Development and implementation of the quasi-online archive system for the mixed astrometrical and photometrical data." [S.l. : s.n.], 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11878639.

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37

Echeverría, Solís Alex Mauricio. "Astrometría desde un enfoque Bayesiano." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/138544.

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Abstract (sommario):
Ingeniero Civil Eléctrico<br>En la Astronomía ha habido un salto cuantitativo gigantesco desde el nacimiento de la tecnología CCD y las imágenes digitales. A pesar de ello, todavía existe un espacio de mejora en lo que respecta a las técnicas para estimación de parámetros importantes que caracterizan a las estrellas. Es por eso que esta Memoria de Título se presenta como objetivo el estudiar y cuantificar el uso de nuevos enfoques de estimación modernas no aplicados aún en esta disciplina para la estimación de la posición de objetos luminosos (Astrometría). Para poder entender el problema se
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38

Libralato, Mattia. "Astrometry and photometry with wide-field imagers." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424959.

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Abstract (sommario):
Several projects in astronomy require detectors with a high number of resolution elements on the sky. For this reason, many observatories equipped their telescopes with a particular kind of detectors, the so-called wide-field imagers, that fulfil this requirement. In this thesis we show that, with a careful data analysis based on an accurate point-spread-function (PSF) modelling and geometric-distortion correction, it is possible to obtain high astrometric and photometric accuracy over wide field of views (FoVs). The prescriptions discussed in the thesis can be extended to the most of the dete
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39

Kirsten, Franz [Verfasser]. "Pulsar astrometry with VLBI and beyond / Franz Kirsten." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1060787172/34.

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40

Salim, Samir. "Applications of High-Resolution Astrometry to Galactic Studies." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1029517017.

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41

Thomas, Eric. "Contributions a l'interferometrie spatiale. Astrometrie globale et detection de planetes extra-solaires." Nice, 2000. http://www.theses.fr/2000NICE5405.

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Abstract (sommario):
En 1992, l'agence spatiale europeenne chargeait un comite d'experts d'etablir les priorites scientifiques des ses futures grandes missions spatiales. En reponse, ce comite recommandait a l'esa l'initiation d'un programme en interferometrie avec deux objectifs. Le premier est la realisation d'observations astrometriques avec des precisions de l'ordre de 10 micro-secondes d'arc et le second, la detection de planetes extra-solaires en interferometrie infrarouge. Dans ce memoire, apres un rappel des grands principes de l'interferometrie, je presente les etudes de concepts d'interferometres adaptes
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42

Page, Gary L. "Exploring the weak limit of gravity at solar system scales." Fairfax, VA : George Mason University, 2009. http://hdl.handle.net/1920/4547.

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Abstract (sommario):
Thesis (Ph.D.)--George Mason University, 2009.<br>Vita: p. 234. Thesis director: John F. Wallin. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computational Sciences and Informatics. Title from PDF t.p. (viewed Oct. 11, 2009). Includes bibliographical references (p. 224-233). Also issued in print.
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Castañeda, Pons Javier Bernardo. "High performance computing of massive Astrometry and Photometry data from Gaia." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/382464.

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Gaia is an extremely ambitious astrometric space mission adopted within the scientific programme of the European Space Agency (ESA) in October 2000. It aims to measure with very high accuracy the positions, motions and parallaxes of a large number of stars and galactic objects, including also for almost all the objects information about their brightness, colour, radial velocity, orbits and astrophysical parameters. Gaia requires a demanding data processing system on both data volume and processing power. The treatment of the Gaia data has been designed as an iterative process between several s
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44

Schildknecht, Benno Schildknecht Thomas. "Optical astrometry of fast moving objects using CCD detectors /." Zürich : Institut für Geodäsie und Photogrammetrie, 1994. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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45

Pourbaix, Dimitri. "Space astrometry of unresolved binaries: from Hipparcos to Gaia." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210649.

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Building upon its success with the Hipparcos space astrometry mission launched in 1989, the European Space Agency has agreed to fund the construction of its successor, Gaia, and its launch in 2011. Despite the similarities between the two missions, Gaia will be orders of magnitude more powerful, more sensitive, but also more complex in terms of data processing. Growing from 120,000 stars with Hipparcos to about 120,000E4 stars with Gaia does not simply mean pushing the computing resources to their limits (1 second of processing per star yields 38 years for the whole Gaia-sky). It also means fa
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46

Deller, Adam Travis. "Precision VLBI astrometry instrumentation, algorithms and pulsar parallax determination /." Swinburne Research Bank, 2009. http://hdl.handle.net/1959.3/48485.

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Thesis (PhD) - Faculty of Information and Communication Technology, Faculty of Life and Social Sciences, Swinburne University of Technology, 2009.<br>Submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy, Faculty of Information and Communication Technology, Swinburne University of Technology, 2009. Typescript. Bibliography: p. 165-186.
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47

Hugentobler, Urs. "Astrometry and satellite orbits: theoretical considerations and typical applications /." [S.l.] : [s.n.], 1997. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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48

Kok, Yitping. "Phase-referenced Interferometry and Narrow-angle Astrometry with SUSI." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10028.

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This thesis describes the development of an astrometric facility at the Sydney University Stellar Interferometer (SUSI) with an aim to measure at high precision the relative astrometry of bright close binary stars and ultimately to detect the presence of exoplanets within those binary star systems through observations of the systems’ perturbed motion. At the core of the facility is a new beam combiner that is phase-referenced to an existing primary beam combiner in the visible wave- length regime. The latter provides post-processed fringe-tracking information to the former for fringe stabiliza
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49

Ciulli, Alexandre. "Cosmologie et supernovas Ia : influence des vitesses propres et recherche d'anisotropies avec LSST." Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC072/document.

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Les supernovas de type Ia (SNIa) sont des objets transitoires, observables pour une durée de quelques mois et dont la luminosité à son maximum équivaut à celle d'une galaxie entière. Une fois standardisées (c'est à dire corrigées de leurs principales variabilités), elles représentent, un excellent indicateur de distance et ont permis de mettre en évidence, en 1998, ce que l'on peut représenter comme une accélération de l’expansion de l'Univers. Cette thèse s’intéresse à trois points qui concerne l’étude de la cosmologie par les SNIa :En premier lieu on s'intéresse à la chaîne de production des
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50

Atri, Pikky. "Constraining black hole natal kicks with high-precision radio astrometry." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/83286.

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Studying the motion of black hole systems in our Galaxy allows us to constrain the distances and velocities of these systems. We used radio telescopes around the globe to measure these motions and report the first observationally determined birth velocity distribution for black holes, helping us understand how these objects are born. We used the motion of unclassified radio sources to identify a new subpopulation of possible Galactic black hole candidates.
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