Results 21 to 30 of about 30,911 (193)

24. Photographic Astrometry (Astrometrie Photographioue) [PDF]

Transactions of the International Astronomical Union, 1991
Despite some much publicized disappointments, the highlights of Astrometry during the past three year period are dominated by the successful launches of the ES A 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   +1 more source

Gaia: Organisation and challenges for the data processing [PDF]

, 2007
Gaia is an ambitious space astrometry mission of ESA with a main objective to map the sky in astrometry and photometry down to a magnitude 20 by the end of the next decade.
Bailer-Jones, C., Bastian, U., Drimmel, R., Eyer, L., Katz, D., Luri, X., Mignard, F., O'Mullane, W., Passot, X., Pourbaix, D., Prusti, T., van Leeuwen, F.   +11 more
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Simulation of CSST’s astrometric capability

Frontiers in Astronomy and Space Sciences, 2023
Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude
Zhen-Sen Fu, Zhen-Sen Fu, Zhao-Xiang Qi, Zhao-Xiang Qi, Shi-Long Liao, Shi-Long Liao, Xi-Yan Peng, Yong Yu, Yong Yu, Qi-Qi Wu, Qi-Qi Wu, Li Shao, You-Hua Xu   +12 more
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Orbital Parameter Determination for Wide Stellar Binary Systems in the Age of Gaia

, 2020
The orbits of binary stars and planets, particularly eccentricities and inclinations, encode the angular momentum within these systems. Within stellar multiple systems, the magnitude and (mis)alignment of angular momentum vectors among stars, disks, and ...
Dupuy, Trent J., Kraus, Adam L., Mann, Andrew W., Newton, Elisabeth R., Pearce, Logan A., Tofflemire, Benjamin N., Vanderburg, Andrew   +6 more
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The History of Astrometry [PDF]

, 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 ...
Perryman, Michael
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Commission 8: Astrometry [PDF]

Proceedings of the International Astronomical Union, 2005
AbstractThis triennial report from Commission 8 covers astrometry-related matters for objects ranging from Solar system bodies out to Milky Way stars and QSOs at cosmological distances. This enormous range of distances is needed to establish, maintain, and improve the metric of the visible Universe--a very challenging effort since everything is moving.
Platais, Imants, I. Kumkova, Irina, Costa, E., Ducourant, C., W. Evans, D., Jin, W.-J., G. Lattanzi, M., Lu, C.-L., Scholz, R.-D., Sôma, M.   +9 more
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Astrometry of circumstellar masers [PDF]

, 2002
The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this technique is discussed, including the accuracy and the uncertainties of the method.
A Eckart, F Colomer, HJ Langevelde Van, HJ Langevelde Van, KM Menten, LO Sjouwerman, P Sivagnanam   +6 more
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Commission 24: Photographic Astrometry: (Astrometrie Photographique) [PDF]

Transactions of the International Astronomical Union, 2000
The scope of scientific interests of about 130 Commission members is much more complex than one may expect from the title of the commission. Besides traditional topics like the compilation of astrometric catalogues and the construction of an inertial reference system, more and more investigations performed by our members have been dedicated to the ...
E. Schilbach, Wenjing Jin, M. Crézé, P. D. Hemenway, I. I. Kumkova, I. K. Platais, S. Röser, C. Turon, J. J. Wang   +8 more
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PEXO : a global modeling framework for nanosecond timing, microsecond astrometry, and μm/s radial velocities [PDF]

, 2019
54 pages, 2 tables, 19 figures, accepted for publication in ApJS, PEXO is available at https://github.com/phillippro/pexoThe ability to make independent detections of the signatures of exoplanets with complementary telescopes and instruments brings a new
Alan P. Boss, Arzoumanian Z., Auer L. H., Beichman C., Catanzarite J., Catanzarite J. H., Damour T., Eastman J., Eastman J., ESA (ed), Event Horizon Telescope Collaboration, Fabian A. C., Fabo Feng, Feng F., Folkner W. M., Folkner W. M., Folkner W. M., Fomalont E. B., Fomalont E. B., Gubler J., Guillem Anglada-Escudé, Hohenkerk C., Holczer T., Hugh R. A. Jones, Irwin A. W., Johns-Krull C. M., Jordán A., Kjeldsen H., Klioner S. A., Klioner S. A., Kopeikin S. M., Kopeikin S. M., Kopeikin S. M., Lelli F., Maksym Lisogorskyi, Mamajek E. E., Mangum J. G., McCarthy D. D., Mignard F., Miralda-Escudé J., Misner C. W., Moe M., Murray C. D., Perryman M., Petit G., Petit G. ed Finkelstein A., Plavchan P., Pourbaix D., Psaltis D. ed Kaaret P., R. Paul Butler, Rüeger J., Sana H., Sergei M. Kopeikin, Standish E., Standish E. M., Thiele T. N., Unwin S. C., Viswanathan V., Weisberg J. M., Wex N., Winn J. N., Wright J. T., Zhao L.   +62 more
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Bound Orbits and Epicyclic Motions around Renormalization Group Improved Schwarzschild Black Holes

Universe, 2022
We study timelike particles’ bound orbits around renormalization group improved Schwarzschild black holes (RGISBHs), which originate from renormalization group improvement of the Einstein–Hilbert action by using the running Newton constant.
Hou-Yu Lin, Xue-Mei Deng
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