Results 131 to 140 of about 41,651 (296)
On reference star recognition and identification
Geodesy and Cartography, 2014 The paper deals with a research in the area of automation of positional star observations. In order to fully employ recent progress in imaging technologies, star image recognition and reference star identification process should gain comparable level of ...
Ansis Zariņš +2 more
doaj +1 more source
The utilization of conventional and VLBI interferometer techniques for accurate determination of UTI, polar motion, and radio source position catalog data is ...
Johnston, K. J.
core +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 +4 more
core +1 more source
Revisiting the Excitation of Free Core Nutation
Journal of Geophysical Research: Solid Earth, Volume 129, Issue 9, September 2024.Abstract Earth possesses a Poincaré mode called Free Core Nutation (FCN) due to the misalignment of the rotation axes of the mantle and fluid outer core. FCN is the primary signal in the observations of Celestial Pole Offsets (CPO) and maintained by geophysical mechanisms that are yet to be understood. Earlier studies suggested an origin in Atmospheric
Mostafa Kiani Shahvandi +4 more
wiley +1 more source
Observational data and orbits of the asteroids discovered at the Molėtai Observatory in 2010–2012
Open Astronomy, 2017 This paper is devoted to the discovery of asteroids at the Molėtai Astronomical Observatory (MAO) in 2010- 2012 together with the orbital analysis of two dynamically interesting Near Earth Objects (NEOs) discovered at the MAO, namely 2006 SF77 and 2010 ...
Włodarczyk Ireneusz +2 more
doaj +1 more source
The Astrometric Foundation of Astrophysics [PDF]
, 2014 Astrophysical studies require a knowledge of very accurate positions, motions and distances of stars. A brief overview is given of the significance and development of astrometry by ESA's two astrometric satellites, Hipparcos and Gaia, launched in ...
Høg, Erik
core +1 more source
Astrometric Methods and Instrumentation to Identify and Characterize Extrasolar Planets: A Review
, 2005 I present a review of astrometric techniques and instrumentation utilized to search for, detect, and characterize extra-solar planets. First, I briefly summarize the properties of the present-day sample of extrasolar planets, in connection with ...
Alessandro Sozzetti +33 more
core +2 more sources
Astrometry with Small Telescopes [PDF]
Symposium - International Astronomical Union, 1986 At the Quonochontaug Observatory of the University of Rhode Island, we specialize in the development of simple seeing limited optical telescopes. Our main instrument is a heavy Serrier trussed f/10.7, .4-m astrometric reflector which provided the last-minute astrometry in the successful prediction of the occultation of SAO 120774 by Herculina in 1978 ...
openaire +2 more sources
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin +11 more
wiley +1 more source
, 2013 High-precision astrometry can identify exoplanets and measure their orbits and masses, while coronagraphic imaging enables detailed characterization of their physical properties and atmospheric compositions through spectroscopy.
Ammons, Stephen M. +14 more
core +2 more sources