... Current APO Weather . ... Search Site . ... Information for New Users . ... Technical Staff pages . Night Logs and Mailing Lists (maintained by APO) . ... Technical Documents and Database Search . ... Observer's Documentation and Procedures . ... Problem Reporting and APO Technical Documents Database Search . ... APO Drawing/Document Management Procedures . ... APO Technical Documents Database Search . Home Astrophysical Research Consortium . ... Mail Lists (maintained by APO) . ...

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• Astrophysical Research Consortium - Apache Point Observatory

... To perform robust image coaddition, mosaic generation, extraction and position determination of faint sources, the pointing will need to be refined to better than a few-tenths of an arcsecond. ... When absolute astrometric references are available, the "fiducial" reference image (mosaic) frame is treated like a single input image, which contains the absolute point source positions. ... The SSC point source extractor was then used to extract 50 point sources from each input image (with pointing error...

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• An Extragalactic Point Source Simulator for SIRTF Pipeline Testing
• QPSIM: An IRAF/PROS Tool for Source Simulation
• ADASS 2002 Conference Proceedings

. XMM-Newton Science Analysis System . arfgen (arfgen-1.75.6) [???] . Meta Index / Home Page / Usage and Examples . Here is another example with an explicit source position - (1000,-1000) in DET coordinates - specified: . arfgen spectrumset=spectrum.pha . withsourcepos=true sourcecoords=det sourcex=1000 sourcey=-1000 . See also 7.4 for details of why the task needs the source position, and how to change it. XMM-Newton SOC/SSC -- 2008-10-22

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• Description

... Positions in 2000 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2001 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2002 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2003 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2004 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . ...

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... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

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• Trigonometry beyond 90 degrees
• Seasons of the Year
• Corrected Geomagnetic Coordinates

. Space Telescope Science Institute . http://www.stsci.edu . Voice: (410) 338-1082 . help@stsci.edu .

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• Chapter 5:  Point Spread Function
• Pointing Accuracy
• Comments

Next: A box, to include Up: To produce a region Previous: To produce a region . select cursor and circle . When in the image window, the mouse now has a box shape with an arrow at the upper left corner. The mouse buttons act as follows: . LEFT - to move the center of the circle at the position of the arrow point. ... RIGHT - idle. center the circle at the point source by positioning the arrow point and clicking on the LEFT mouse button. A circle will appear at the arrow position. ...

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• The AstroStat Slog point spread function
• The AstroStat Slog poisson point process
• SAO RSDC Home Page - RRA - PSPC

... connection points . ... The point P3 is the connection between the horizontal and vertical actuators and is the axis of rotation for the tail gunner motion. processing: survey/020204/reduc We can compute P3,P5 (the moveable points) in dome centerline coordinates if we have the actuator distances and we know the positions of the above connection points in dome centerline coordinates for a given position of the tertiary (say the nominal focus position).(see actuator distances to dome centerline ). ...

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• http://www.naic.edu/~phil/pnt/turretPositions.html
• pntErrVsPlatformMotion
• optics

... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

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• Two points (INTERBALL-1 and MAGION-4) observations of magnetopause motion
• Corrected Geomagnetic Coordinates
• Trigonometry beyond 90 degrees

Operations in Point operations use the pointer to query sets about points, delete points in a set, and move points. In all cases where interaction is required, pressing the right mouse button with the pointer in the drawing area cancels the operation. ... Report on a point in a set . ... Press the left mouse button. ... Press Delete point with the left mouse button to activate. ... Move the pointer to the new location and press the left mouse button again to register the point's new location. ...

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• http://xray.sai.msu.ru/~polar/xmgr/view.html
• http://xray.sai.msu.ru/~ivan/gmt/man/fitcircle.html
• http://xray.sai.msu.ru/~ivan/gmt/man/grdtrack.html

... The first of the equations defines the position of the spectral orders, m , in the raw image, while the second equation gives, for each order, the dispersion relation in one dimension. ... where the coefficients are computed using least squares techniques on a grid , i.e. sample number and line number of points located within the spectral orders of the image. These points in the grid are found automatically by an order--following algorithm, normally using the FLAT or STD image. ...

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• Source Positions
• Star tables
• Other Useful Commands

WCSLIB љ 5.15 . ... sph.h File Reference . Go to the source code of this file. intљ . sphx2s (const double eul[5], int nphi, int ntheta, int spt, int sxy, const double phi[], const double theta[], double lng[], double lat[]) . ... sphs2x (const double eul[5], int nlng, int nlat, int sll, int spt, const double lng[], const double lat[], double phi[], double theta[]) . ... sphdpa (int nfield, double lng0, double lat0, const double lng[], const double lat[], double dist[], double pa[]) . ...

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• kpvslice: interactive position-velocity slicing
• The GIPSY Recipes Book
• Satellite Tracking

... 24 } Line { SrcBlock sin SrcPort 1 DstBlock func1 DstPort 1 } Line { SrcBlock Fcn SrcPort 1 Points [0, -55] DstBlock func DstPort 1 } Line { SrcBlock (G*M) ^1/2 SrcPort 1 Points [25, 0] DstBlock func DstPort 3 } Line { SrcBlock func SrcPort 1 Points [40, 0] Branch { ...

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Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Moon . ... Space Flight . ... Science Fiction . UFOs and Fringe Science . Monthly Sky Notes . ... NASA's Cassini spacecraft obtained this image of Saturn's moon Helene on June 18, 2011. Image credit: NASA/JPL-Caltech/Space Science Institute) . ... Your email address will not be published. ... Email * . ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

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Russian Academy of Sciences Pulkovo Observatory On systematic and stochastic errors of radio source position catalogues Zinovy Malkin Pulkovo Observatory and St. Petersburg State University malkin@gao.spb.ru JournИes 2013, Paris, France, September 2013 Topics to discuss The following topics related to the radio source position catalogues are considered: 1. ... A new approach to assess the external stochastic errors of radio source position catalogues has been presented. ...

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• http://www.gao.spb.ru/english/as/j2014/presentations/vavilov.pdf
• http://www.gao.spb.ru/english/personal/malkin/publ/zm12c.pdf
• The Canadian S2 Correlator - Principles of Radio Interferometry

This diagram illustrates the effects of absolutely positioning a box. A document window is shown, with 8 lines (numbered 1 to 8), each 24px high. All text outside the "outer" box has been flowed into lines 1 and 2. The "outer" box is positioned absolutely so that it occupies the lower right quadrant of the document window. ... The lines, as they appear in the image, contain: 1 Beginning of body contents. End of 2 body contents. ... Inner 7 contents. End of 8 outer contents. ...

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• Long description illustrating absolute positioning with respect to the initial
• Long description for example illustrating positioning with respect to a
• Dynamic HTML in Communicator

... F10.7, format: hh.dec: . LT, format: hh . ... F10.7< = 200. for LT=18., 20., 22., 0., 2., 4. or 6. ... LT, format: hh.dec . LAT[-40.,-80.], format: hh.dec . ... F10.7<= 200. for LT from [18.,24.) to [0., 6.] . ... LONG [0., 360.], format: hh.dec . ... at Longitude [0., 360.] . ... LONG [0., 360.] . with Latitude [-40.,-80.] and Longitude [0., 360.] . ... F10.7< 200. or LT from [18.,24.) to [0., ... MIT position and foF2 in the trough . ...

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• SINGULAR POINTS IN THE SOLAR CHROMOSPHERE

IRAF/STECF 2-D spectrum point source / background decomposition package . ... The general problem is one of spectral decomposition - of separating the spectra of the point sources from the background. ... The STECF IRAF layered package "specres" provides two tasks to extract point source spectra from 2-D images (either longslit, multislit or cross-dispersed) and decompose the full background over the image. ... A Point Source Function spectrum image is required as a 2-D spectrum. ...

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• POLIMPLOT (V2.00) --- November00 --- POLIMPLOT (V2.00)
• FORS1 Photometric System Characterization
• A visual tour

... Activity 3: Measuring the Position of the Sun in the Sky . Purpose: To give students the opportunity to measure the position of the Sun in the sky using simple tools and methods. ... Alternatively, you may have students devise their own methods of relative measurement and apply them to measuring the position of the Sun in the sky. ... Rangi is the sky, and when the Sun is near Rangi's head it is summer in New Zealand. ... Read the Maori story to students. ... back to Teachers' Newsletter Main Page ...

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• ASP: To Every Season There is a Reason
• ASP: Indiana Jones and the Astronomers of Yore
• ASP: Monster Comet Promises Big Show

polimplot -- Plot a polarization vector map . ... inpol = "" [name] . Input linear polarization image (in %) to plot. inpopa = "" [name] . Input image for position angle of linear polarization vectors (degrees). poi_err = "" [boolean] . ... Name of corresponding polarization position angle error image (degrees). ... This task is a flexible tool for plotting a polarization vector map from two images of the polarization and the position angle of the polarization vector. ...

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• ST-ECF IRAF package
• Some Experiments with the Restoration of NICMOS Camera 2 Images of OMC-1
• stecf.cplucy - Enhanced Two-channel Photometric Restoration