... The WFPC2 cameras have significant geometric distortion which not only affects astrometry, but also affects photometry (because the extended sources used to generate flat fields have an induced change in apparent surface brightness). It can be a large effect, with "true" positions differing from observed positions by several pixels in the corners of the cameras. ... The cubic distortion coefficients can be used to derive effective pixel areas as presented in Figure 5.12 . ...

Next: Resampling the Data Up: Geometric Correction Previous: Getting the Dispersion . The distortion љ along the slit can be modelled using an image containing one or several spectra of (ideally: point-) sources with well defined continuum. ... If the resulting coefficients are stored in the keyword COEFY*, (*=I,R,D) and combined with suitable (if necessary: dummy) coefficients for the dispersion resolution in the keyword KEYLONG*, (*=I,R,D) , the command RECTIFY/LONG can be applied. ...

... The plug-plates for the Sloan Digital Sky Survey are drilled with the plate elastically deformed over a convex mandrel and with the sky-facing side away from the mandrel. ... The deformation of the plug-plate by the drilling mandrel and the plug-plate cartridge causes radial distortion of the plate that must be anticipated by the computer numerical controlled (CNC) drilling program so that the end of each fiber optic is positioned correctly on the focal surface by the plug-plate. ...

... Distortion from a Distant Cluster . ... Hardly noticeable in the original picture is the small cluster of about 15 galaxies nearly 3 billion light-years distant , circled at the lower right. ... As predicted by Einstein's General Relativity theory, the cluster's gravitational mass acts like a lens, bending light and distorting the shape of background galaxies. ... Publications with keywords: gravitational lens - galaxy cluster . Publications with words: gravitational lens - galaxy cluster . ...

... 2001 August 23 . Distortion from a Distant Cluster . ... As predicted by Einstein's General Relativity theory, the cluster's gravitational mass acts like a lens, bending light and distorting the shape of background galaxies. ... Computer mapping of weak distortions of background galaxy shapes across the Big Throughput image revealed that the large scale distribution of mass in that part of the sky was concentrated in a small region. ... About APOD | ...

... 1024 x 768 x 256 display mode is distorted. ... VESA LB Video card with S3 805 chip, 1MB RAM. ... The problem seems to be that SVGA.EXE shipped with Warp generates an SVGADATA.PMI file that does not properly "program" this particular type of S3 card. ... This generates the Warp version of \OS2\SVGADATA.PMI that you need as a base for later steps . ... Edit \OS2\SVGADATA.PMI and replace the 1024 x 768 x 256 mode configuration with the equivalent section from \OS2\PMI\OLD\SVGADATA.PMI . ...

Declination: -85.0 -80.0 -75.0 -70.0 -65.0 -60.0 -55.0 -50.0 -45.0 -40.0 -35.0 -30.0 - 25.0 - 20.0 - 15.0 - 10.0 - 5.0 0.0 5.0 10.0 15.0 20.0 25.0 degrees Wavelength: 3800.0 3900.0 4000.0 4100.0 4200.0 4300.0 4400.0 4500.0 4600.0 4700.0 4800.0 4900.0 5000.0 5100.0 5200.0 5300 ASCII file: . PDF file: . PNG file: . ...

... disprm Struct Reference . ... Returned ) Pointer to the first element of an array of int* containing pointers to the first elements of the arrays of integer distortion parameters for each axis. double ** disprm::dparm . Returned ) Pointer to the first element of an array of double* containing pointers to the first elements of the arrays of floating point distortion parameters for each axis. int disprm::i_naxis . ... Returned ) The number of distortion functions. struct wcserr * disprm::err . ...

... Calabretta, M. R., Valdes, F., Greisen, E. W., & Allen, S. L. 2003, in ASP Conf. ... Of particular interest to the fields of astrometry and spectroscopy, the fourth in a series of papers defining conventions for encoding world coordinate information in FITS headers will consider the problem of representing small systematic errors, or distortions. ... Greisen, E. W., Valdes, F. G., Calabretta, M. R. & Allen, S. L. 2003, A&A, in preparation, Representations of spectral coordinates in FITS (Paper III) ...

... Пластилин - Набор для праздника Hasbro с 2 лет - 15 баночек с разноцветным пластилином . ... Браслеты . ... Детская лыжная куртка JUNGLE от Fusalp - модель, в которой актуальный спортивный стиль сочетается с новейшими технологиями обработки материала. ... Цвет: Черный . ... Цвет луча: красный ; . ... Цвет: разноцветный . ... Материал верха: спилок, текстиль . ... Материал подошвы: резина . ... Кроссовки Nike. Цвет: мультиколор. Материал: спилок, текстиль. ... Мужская обувь Nike - Nike - Nike . ...

... Two additional extensions contain the polynomial coefficients describing the distortion for all the filters. FILTER-U . ... Each extension FILTER-FilterId holds a binary table sampling the detector distortion of a specific filter at a coarse resolution ( 1 datapoint every 25 subpixel). ... The filter element is found in the column FILTER_ID. The required binary table entry is identified by matching the value of the column FILTER_ID with the State Variable FilterID. ... not applicable . ...

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Chandra Proposer's Guide pile up section ] During frame readout, the ACIS CCDs take 40 microsec to (parallel) transfer the charge by one pixel. As a result of this, each frame readout, each pixel is exposed for 40 microsec to a source (plus cosmic X-ray background) at each location along its column. ... Note also that the image does not just trail, it extends along the whole column. ... Chandra Supernova Remnant Catalog . ...

... IMAGEH = 2592 / Image height, in pixels. ... HISTORY For more details, see http://astrometry.net . ... COMMENT -- blind solver parameters: -- COMMENT Index (0): / usr / local / astrometry / data / index -4018.fits COMMENT Index (1): / usr / local / astrometry / data / index -4017.fits COMMENT Index (2): / usr / local / astrometry / data / index -4016.fits COMMENT Index (3): / usr / local / astrometry / data / index -4015.fits COMMENT ...

Stellarium 0.12.3 . ... FileљStructure . ... SphericalRegion . DrawParams . ... SphericalRegion::DrawParams Struct Reference . Parameters specifying how to draw a SphericalRegion . More... #include < StelSphereGeometry.hpp > . DrawParams (class StelProjector *projector) . Construct DrawParams with default parameters and specified projector. ... Do not subdivide the region to follow projection distortions. ... class StelProjector * SphericalRegion::DrawParams::projector_ . ...

Main Program Travel Where to go in Moscow Information . ... The 2014 year marks the 100th anniversary of Yakov Zeldovich . ... John Carlstrom (University of Chicago) . ... Lyman Page (Princeton University) . ... The conference will be held at the Space Research Institute (IKI) in Moscow, Russia, on June 16-20, 2014 . ... International Conference: Cosmology and High Energy Astrophysics (Zeldovich-90) 20-24 Dec 2004, Moscow, Russia . ... 2014 Space Research Institute, Moscow Русская версия ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

LBO LBO has many unique characteristics that contribute to its wide use as a nonlinear optical crystal. ... LBO Specifications Wavefront Distortion Dimension Tolerance Clear Aperture Scattering Sites Flatness Surface Quality Parallelism Perpendicularity Angle Tolerance Damage Threshold /8 at 633nm (W: +/- 0.1mm ) x (H: +/- 0.1mm ) x (L: + 0.2mm/- 0.1mm ) 80% of central area No visible scattering centers when inspected by a 30 mW green laser /8 at ...

Polarization signatures of clusters in the microwave background Anthony Challinor University of Cambridge, U.K. Galaxy clusters along the line of sight leave an imprint in the po- larization of the cosmic microwave background radiation (CMB). ... We also discuss the prospects of detecting such e ects, and outline some possibili- ties for using cluster polarization as a probe of cluster physics and cosmology. ...

Download Izmccd (~2.7 MB). ... a) a choice of the best mode of measurements of stars and objects ("Properties/Measurement"), . b) a choice of reference stars. ... 1) necessity of presence on an image of a plenty of stars (we recommend to apply this mode, if on the frame of reference stars is more 100) . ... Sx and Sy depend from residuals at all reference stars (reference stars are marked by blue color). ... These residuals are the image of the star a minus function of a profile for each pixel. ...