Results 51 to 60 of about 31,207 (206)

PHASES High Precision Differential Astrometry of delta Equulei

, 2005
delta Equulei is among the most well-studied nearby binary star systems. Results of its observation have been applied to a wide range of fundamental studies of binary systems and stellar astrophysics.
Aristidi E., Balega I., Balega I. I., Balega I. I., Balega I. I., Balega Y. Y., Benjamin F. Lane, Bernard F. Burke, Boehm C., Bonneau D., Bonneau D., Castelli F., Couteau P., Couteau P., Couteau P., Danjon A., Docobo J. A., Duquennoy A., Finsen W. S., Finsen W. S., Finsen W. S., Finsen W. S., Finsen W. S., Finsen W. S., Finsen W. S., Habets G. M. H. J., Heintz W. D., Holden F., Ismailov R. M., Isobe S., Jeffers H. M., M. M. Colavita, M. Shao, Maciej Konacki, Matthew W. Muterspaugh, Miura N., Morgan B. L., Morgan B. L., Muller P., Muller P., Rabl G., S. R. Kulkarni, Smalley B., Soderhjelm S., Starikova G. A., Struve O., Tokovinin A. A., Tokovinin A. A., Tokovinin A. A., Tokovinin A. A., van den Bos W. H., van Leeuwen F., Wilson R. H., Wilson R. H., Wilson R. H.   +54 more
core   +1 more source

FinalKAN: A Dual‐Stream KAN Network Integrating Multisource Features for Radio Telescope Pointing Correction

Advances in Astronomy, Volume 2026, Issue 1, 2026.
This paper investigates the degradation of pointing accuracy in the Kunming 40‐m radio telescope due to long‐term equipment aging and environmental disturbances. Conventional linear pointing models are constrained by their linear modeling framework, making it difficult to accurately represent the nonlinear errors induced by temperature, wind speed, and
Yao He, Longfei Hao, Wei Dai, Fernando Aguado Agelet   +3 more
wiley   +1 more source

Optimality of the Maximum Likelihood estimator in Astrometry

, 2018
The problem of astrometry is revisited from the perspective of analyzing the attainability of well-known performance limits (the Cramer-Rao bound) for the estimation of the relative position of light-emitting (usually point-like) sources on a CCD-like ...
Espinosa, Sebastian, Lobos, Rodrigo, Mendez, Rene A., Orchard, Marcos, Silva, Jorge F.   +4 more
core   +1 more source

Astrometry

, 2023
An introduction to how astrometric measurements are done with long-baseline optical interferometry, in single or dual-field, and in particular with the GRAVITY instrument.
openaire   +1 more source

Uncertainties in Historic Visual Double Star Measures—III Accurate Calibration Pairs

Astronomische Nachrichten, Volume 346, Issue 10, December 2025.
ABSTRACT Based on space‐based positions and proper motions, we present accurate rectilinear elements for 857 double star pairs over the celestial sphere. These elements allow for the computation of precision ephemeris Position Angles and Separations of these pairs.
Roderick R. Letchford, Graeme L. White
wiley   +1 more source

An Efficient Method for Measuring the Color of a Natural Satellite with Astrometric Applications

The Astronomical Journal
The Gaia DR3 catalog released in 2022 contains precise broadband photometry for more than one billion stars in the G , BP, and RP passbands, which is very useful for calibrating the differential color refraction (DCR) effect in ground-based observations.
X. Q. Fang, Q. Y. Peng, X. Lu, B. F. Guo
doaj   +1 more source

Astrometry Lost and Regained

Open Astronomy, 2011
Technological and scientific developments during the past century made a new branch of astronomy flourish, i.e. astrophysics, and resulted in our present deep understanding of the whole Universe.
Høg E.
doaj   +1 more source

Initial Scientific Results from Phase-Referenced Astrometry of Sub-Arcsecond Binaries [PDF]

, 2004
The Palomar Testbed Interferometer has observed several binary star systems whose separations fall between the interferometric coherence length (a few hundredths of an arcsecond) and the typical atmospheric seeing limit of one arcsecond.
Burke, B. F., Konacki, Maciej, Kulkarni, S. R., Lane, Benjamin F., Muterspaugh, Matthew W.   +4 more
core   +3 more sources

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

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer, Michael E. Brown, Martin Cordiner, Richard Teague   +3 more
wiley   +1 more source