Results 21 to 30 of about 305,396 (186)
Recent results and perspectives for precision astrometry and photometry with adaptive optics [PDF]
Astronomical Telescopes + Instrumentation, 2010 Large ground-based telescopes equipped with adaptive optics (AO) systems have ushered in a new era of highresolution infrared photometry and astrometry. Relative astrometric accuracies of
Jessica R. Lu +6 more
semanticscholar +1 more source
First time-series optical photometry from Antarctica [PDF]
Astronomy & Astrophysics, 2008 Beating the Earth's day-night cycle is mandatory for long and continuous time-series photometry and had been achieved with either large ground-based networks of observatories at different geographic longitudes or when conducted from space. A third possibility is offered by a polar location with astronomically-qualified site characteristics. Aims.
Strassmeier, K. G. +13 more
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Stellar Photometry with the Optical Monitors [PDF]
International Astronomical Union Colloquium, 1993 AbstractThe Optical Monitors are small optical telescopes which will fly on board of the X-ray satellites SPECTRUM-X-GAMMA (JET-X experiment) and XMM. Their main scientific applications are the simultaneous observations (imaging) in the optical and UV band of the optical counterparts of X-ray sources, with limiting magnitudes of aboutmv=22(JET-X) and ...
E. Antonello, M. Cropper
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Optical Photometry of GRB 021004: The First Month [PDF]
The Astronomical Journal, 2003 21 pages with five figures. Uses AASTEX 5.02. To appear in AJ.
Holland, S.T. +19 more
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Rationale for the Choice of the Ellipsoidal Reflector Parameters for Biomedical Photometers
Приборы и методы измерений, 2021 Biomedical photometersʼ information-measuring systems with ellipsoidal reflectors have acceptable results in determining of biological tissues optical properties in the visible and near-infrared spectral range. These photometers make it possible to study
N. V. Bezuglaya +5 more
doaj +1 more source
Fast CCD Photometry in the Taiwan-America Occultation Survey
Open Astronomy, 2003 We describe the efforts of the Taiwan-America Occultation Survey (TAOS) project to develop a data acquisition and analysis scheme for fast CCD imaging photometry.
Chen W. P. +18 more
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Accurate photometry with adaptive optics in the presence of anisoplanatic effects with a sparsely sampled PSF [PDF]
, 2009 Anisoplanatic effects can cause significant systematic photometric uncertainty in the analysis of dense stellar fields observed with adaptive optics. Program packages have been developed for a spatially variable PSF, but they require that a sufficient ...
R. Schoedel
semanticscholar +1 more source
Angular Photometry of Biological Tissue by Ellipsoidal Reflector Method
Приборы и методы измерений, 2019 Angular measurements in optics of biological tissues are used for different applied spectroscopic task for roughness surface control, define of refractive index and for research of optical properties.
M. A. Bezuglyi +3 more
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REFERENCE-LESS DETECTION, ASTROMETRY, AND PHOTOMETRY OF FAINT COMPANIONS WITH ADAPTIVE OPTICS [PDF]
, 2008 We propose a complete framework for the detection, astrometry, and photometry of faint companions from a sequence of adaptive optics (AO) corrected short exposures.
S. Gładysz, J. Christou
semanticscholar +1 more source
The photometry of optical instruments [PDF]
Transactions of the Optical Society, 1922 The use of a portable surface-brightness photometer of the polarisation type for the measurement of the fraction of the incident light transmitted by an optical instrument or reflected by a mirror or system of mirrors, and for the measurement of the relative brightness of different parts of the field of view of an optical instrument, is described.
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