... BARS.BDF . consists, firstly, of three rectangular bars; each of length 25 pixels; of width 1, 4, and 9 pixels; horizontally positioned; and flush with pixel boundaries. The uniform flux density in each pattern is 100 units per pixel. ... In order to illustrate the case of a point spread function which in one dimension is extremely undersampled, a delta function is also included (the lower left hand pattern in BARS). ... Uniform flux density of 100 units/pixel is used. ...

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... Figure 1.1 on page 2 also illustrates the projected orientation of the WFPC2 CCDs onto the sky. ... On the CCDs this region appears as a blank "shadow" region along the X~0 and Y~0 edges of each CCD; the exact limits of this region are given in Table 2.5 for each CCD. ... The WFPC2 has two readout formats, namely full single pixel resolution ( FULL Mode), and 2x2 pixel summation ( AREA Mode which is obtained by specifying the optional parameter SUM=2x2 as described in the Proposal Instructions). ...

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• COS Instrument Handbook
• Polarizer Quad Filter
• Introduction to Patterns

... the radiative transfer equation (RTE) for the randomly-irregular magnetized plasma has been derived on the base of general grounds of the multiple scattering theory . ... Solutions of several absolute tasks of the scattering theory have been obtained (on the optical depth of the ionospheric plasma layer, on the value of radio wave anomalous attenuation, on anomalous refraction, on the backscattered signal intensity for the source being placed within a plasma layer). ...

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... Coordinate system . It is necessary to specify the coordinate system for the drilling of plug-plates so that the drilling file (currently named plPlugMap), plate drilling, cartridge, rotator wrap and the rotator itself are compatible. ... The TCC rotator angle (object system) is defined to be 0 degrees for this orientation. ... Thus, the rotator angle gives the conventional astronomical position angle on the sky of the y axis (although Russell won't acknowledge this necessarily). ...

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• Rotation range
• Instrument Orientations and Offset Directions

... satvelsrc computes as a function of time the component of the spacecraft velocity vector in the direction of given celestial source. ... SAS_ODF . or named via the generic command line parameters -o or -odfdir (see taskmain for details). ... The source coordinates obtained from the ODF can be overridden with the command line paramters withsrccoord=yes srcra=<ra> srcdec=<dec> and withorthosrc=yes defines a fictitious source in the direction perpendicular to the orbital plane. ...

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• Description

Intensity of atmospheric motions in the mabl retrieved from ocean surface radar imagery M. Mityagina E-mail: mityag@iki.rssi.ru Abstract. The paper is dedicated to the theory and practice of analysis of radar images of sea surface, obtained under unstable atmospheres. In this case, the sea surface reveals wind field variations in the marine atmospheric boundary layer (MABL) caused by atmospheric convec-tive processes, accompanied by air motions with mainly vertical direction. ...

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• Trigonometry beyond 90 degrees
• Space physics cordinate systems
• Problems in Trigonometry

Program: ANTPAT Purpose: Calculate beam width (Full Widths at Half Maximum) and position angle of synthesized beam. ... BOX= Give box in ..... [entire subset] The data enclosed by this box will be used to estimate the beam parameters: Full Width At Half Maximum (FWHM) of major axis, FWHM of minor axis and the position angle Only the data within the box that belong to the first maximum of the antenna pattern with a value greater than or equal to CLIP= will be used in the calculations. ...

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• http://www.atnf.csiro.au/computing/software/gipsy/sub/fitgauss2d.dc2
• http://www.atnf.csiro.au/computing/software/gipsy/tsk/rotcur.dc1
• WCSLIB: sph.h File Reference

spaceweb@oulu.fi - last update: 21 December 1998, 1400 UT (RR) . ... This is not as trivial a question as one might think, since it is not enough to know the location with respect to the Earth and/or the Sun in some arbitrary coordinate system. One may have to consider things like differences between the solar equatorial plane and the Earth's orbital plane, the changing direction of Earth's spin axis during the year, and the magnetic dipole orientation. ... Geocentric solar ecliptic . ...

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• Trigonometry beyond 90 degrees
• Basic definitions [Oulu]
• Maps of the Heavens

Coordinate Systems used for spacecraft trajectory description: . ... The HGI coordinates are Sun centered and inertially fixed with respect to an X-axis directed along the intersection line of the ecliptic and solar equatorial planes. ... Cometocentric (solar) Ecliptic Coordinate System (CSE) . ... CSE coordinate system for the SC POSITION: axis origin at comet center, X-axis to the SUN, Z-axis to ecliptic north pole, (X,Y)-plane is parallel to the ecliptic plane. ...

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... When feed is rotated over the tertiary: . ... z is toward the tertiary from the focus position . ... angle : Center of rotation is about the optical axis. range 0 to 360 degrees (minus a few degrees for the limits) . ... CW when sitting on the tertiary looking up at the dipoles. radius : moves in the x,y plane along the direction that the angle currently points . ... Dipole positions : . ... D1 is at the center of the dipole array. processing: x101/projects/byuPhAr/idl/doplotoff.pro . ...

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• Orbits in the period / acceleration plane
• puntasalinas radar
• alfabmmaps

pswiggle - Plot anomaly along track on a map pswiggle xyz _ files -J parameters -R west / east / south / north [ r ] -Z scale [ -A direction ] [ -B tickinfo ] [ -C center ] [ -D gap ] [ -E azimuth / elevation ] [ -G fillrgb ] [ -H [ nrec ] ] [ -I fix _ az ] [ -K ] [ -M [ flag ] ] [ -N ] [ -O ] [ -P ] [ -S [ x ] lon0 / lat0 / length [ units ] ] [ -T ... Je lon0 / lat0 / scale (Equidistant). ... I Set a fixed azimuth projection for wiggles [Default uses track azimuth, but see -A ]. ...

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• http://xray.sai.msu.ru/~ivan/gmt/man/grdgradient.html
• http://xray.sai.msu.ru/~ivan/gmt/man/grdedit.html
• http://xray.sai.msu.ru/~ivan/gmt/man/grdvector.html

... The Earth orientation parameters UT1 and polar motion (x pol ; y pol ) are relat­ ed with the values of UT0 and VOL obtained from the LLR analysis for a station with geocentric longitude and latitude (–; OE) by the following expression: 7 UT0 \Gamma UTC = UT1 \Gamma UTC + (x pol sin – + y pol cos –) tan OE 15 V OL = x pol cos – \Gamma y pol sin – At least four normal points for each station--reflector pair at one day were accepted for the diurnal UT0 estimations. ...

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• IAA EOP Service
• ENGAMPLE
• (Untitled)

Stellarium 0.12.3 . ... TextParams Struct Reference . Parameters specifying how to draw text. ... TextParams (const float x, const float y, const QString &string) . Construct TextParams with default parameters. ... TextParams ( Vector3 < F > &position3D, StelProjectorP projector , const QString &string) . Construct TextParams to draw text at a 3D position, using specified projector. ... string љ . ... Text string to draw. ... The required string parameter is also set, as is the projector. ...

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• Stellarium: core/planetsephems/gust86.h Source File

This WWW form allows the user to obtain "postage stamp" FITS or jpeg images or contour plots of selected, small fields from the The VLA Low-Frequency Sky Survey (VLSS, formerly VLSS). ... The specified region of the closest VLSS field is returned as a FITS or jpeg format image or a contour plot. ... The VLSS postage stamp server can return a FITS file with the MIME type of image/x-fits; your browser needs to be told a suitable display program for FITS files. ...

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• Help for FIRST Survey Postage Stamp Server incl contour option
• Determination of the relative orientation between radio and dynamical reference
• NVSS Postage Stamp Server Documentation Help for NVSS Postage Stamp Server

... Previous: Residual Bias Removal in HST NICMOS Images . ... Bias frames taken with CCDs should be homogeneous in intensity. ... Using a large number of bias frames obtained in one specific run, the time-dependent pattern was found to be built up of a fixed one-dimensional periodic function whose phase-shift varies from row to row. It was successfully removed from calibration and science frames through the use of pre- and upscan ``bias'' pixels available in each of these frames. ...

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• Representations of Celestial Coordinates in FITS
• Identification and Analysis of Binary Star Systems using Probability Theory
• Discrimination of Point-like Objects in Astronomical Images using Surface

Classroom Activity: Pinhole Protractor Gene Byrd and Renato Dupke . ... We cannot directly perceive the distances or sizes of far-away objects. Instead, our eyes only detect the angular size of objects. ... In Part II, which will appear in a future issue of The Universe in the Classroom, students will see how astronomers use parallax -- an extension of binocular vision -- to determine the distances of stars in the Sun's neighborhood. ... distance = 57.3 x physical size angular size (in degrees). ...

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• ASP: Using Multicultural Dimensions to Teach Astronomy

... PUL2 catalog contains original absolute proper motions of 59646 stars in 149 fields with galaxies. ... Mean errors of relative proper motions in PUL2 catalog is 5.5 mas/year. ... The external mean error of one relative proper motion of a bright star of PUL2 catalog is 9 mas/year for both of coordinates. ... After issue of UCAC2 catalog, we decided to improve accuracy of proper motions, using Pul-3 coordinates (of 1950s) as the first epoch, and UCAC2 coordinates as the second epoch. ...

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Text of these problems is available also in other languages : . ... What can one see in the Moon's sky more often - the Sun or the Earth? ... There are about of 250 millions of stars in the elliptical galaxy M32 (a satellite of Andromeda galaxy). ... The masses of Capella's components. ... You are proposed to estimate the masses of Capella's components, using our observational data. ... A galaxy's mass. ... Estimate the mass of FGC 1908 and compare it to the mass of our galaxy. ...

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• BRIZ: a vizualization program for Brillouin zone ? Fermi sphere
• Stuff LSR ISSP RAS
• Laboratory for Spectroscopy of Molecular Structures

... Several attempts to discover the FICN signal in VLBI nutation series made during last years failed. ... We investigated several VLBI CPO series by means of spectral and wavelet analysis. It has been shown that there are several periodic signals with close amplitude around the expected FICN period without any prevailing one that can be reliably associated with the FICN. ... DATA ANALYSIS We analyzed several CPO series obtained in IVS analysis centers by means of spectral and wavelet analysis. ...

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• http://www.gao.spb.ru/english/personal/malkin/publ/zm12e.pdf
• http://www.gao.spb.ru/english/personal/malkin/publ/zm14e.pdf
• Pulkovo NEO Page: Ephemeris Support

... An estimate the rotation period of cometary nuclei is important for understanding and describing the physical processes of the cometary activity. Unfortunately, the measurements of the rotation periods of the comet nucleus depend on the model assumptions and it is one of the main reasons for the scatter of the estimates given in various articles for a given comet. ... Right: the image of the comet 29P/Schwassmann-Wachmann 1 obtained at the 6-m telescope. ...

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• Measurement of the dark halo shape in polar ring galaxies
• Galaxy sector, archive 2004
• Sun image