... 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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• Astigmatism II
• Deforming Plug-plates
• Measurements of 3.5-m Secondary Mirror Motions

... Aperture is the generic term used for any targetable area in an SI; a small slit, an occulting finger, different points on a CCD, a virtual aperture that encompasses a number of chips (e.g. WFALL), anything that can be specified in the APERTURE field of the proposal file, and a few more that can't. The scales, orientations, locations in the HST FOV, and a number of other properties of these targetable areas are calibrated and updated periodically. ... Observation Log (jitter file) Documentation . ...

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• Pointing Accuracy
• WFC3 Aperture Coordinate System
• Appendix B: Point Source SNR Plots

... Tonight's Sky . ... The Magazine . News . Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... lagrangian points . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

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• How big are the Lagrangian points? I hear of telescopes orbiting at a certain
• Laser pointer safety | Astronomy.com
• Data from NASA's Voyager 1 point to interstellar future | Astronomy.com

... 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/optics/hornpos/121102/sb_surveyresults.pdf
• Alfa_ang - IDL procedure for calculating the optimum rotation angle for ALFA
• The Telescope Optics and Pointing

Total number of pointings to be observed in survey : 2670 Number of unique pointings observed so far: 2350 Number of unique ptgs on processed tapes : 0 Number of pointings on dud tapes : 88 Number of processed pointings on dud tapes : 0 Number of non- survey pointings found : 29211 Number of short or test survey pointings ...

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• Deconvolution with CLEAN
• WCSLIB: Example code, testing and verification
• The GIPSY Recipes Book

... The mouse pointer is represented on the screen by a small bitmap called the cursor . ... GdkWindow* gdk_window_get_pointer (GdkWindow* window , gint* x , gint* y , GdkModifierMask* state ); . ... It is possible to grab the pointer, which means that all pointer events will go to the grab window for the duration of the grab. ... gint gdk_pointer_grab (GdkWindow* window , gint owner_events , GdkWindow* confine_to , GdkCursor* cursor , guint32 time ); . void gdk_pointer_ungrab (guint32 time ); . ...

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• Rulers
• Source Positions
• Discussion

IBIS Data Analysis . ... IBIS . ... Flat Fielding - Introduction . The images obtained by IBIS will have intensity variations across the field of view that are not due to the solar image, but rather caused by instrumental effects that alter the observed intensity in each point of the field of view. ... IBIS Flat Fielding Techniques . ... Therefore, it is desirable to obtain the flat field measurements center on a point along the equator near the heliographic center of the solar disk. ...

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Astronomy Picture of the Day . ... Credit: NOAA Explanation: A magnetic compass does not point toward the true North Pole of the Earth. ... Evidence indicates that the North Magnetic Pole has wandered over much of the Earth's surface in the 4.5 billion years since the Earth formed. ... Indicated in the above picture is Ellef Ringnes Island , the location of Earth's North Magnetic Pole in 1999. ... Publications with keywords: Earth - north pole - magnetic north . ... Earth at Twilight . ...

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• Earth's North Magnetic Pole
• Астронет > Earths North Magnetic Pole
• Астронет > Earth's North Magnetic Pole

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

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• A Graphical Field Extension for sky
• A Program Complex Equipped With a GUI for Investigation of 3D Structure of
• ADASS 2003 Conference Proceedings

nearneighbor - A Nearest neighbor gridding algorithm nearneighbor [ xyzfile ( s ) ] -G out _ grdfile -I x _ inc [ m|c ][/ y _ inc [ m|c ]] -N sectors -R west / east / south / north [ r ] -S search _ radius [ m|c|k|K ] [ -E empty ] [ -F ] [ -H [ nrec ] ] [ -L flag ] [ -V ] [ -W ] [ -: ] [ -bi [ s ][ n ] ] nearneighbor reads arbitrarily located (x,y,z[,w]) triples [quadruplets] from standard ... Default is quadrant search, i.e., sectors = 4]. ... H Input file(s) has Header record(s). ...

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• http://xray.sai.msu.ru/~polar/xmgr/points.html
• Initial Distributions of Binary Parameters

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... The algorithm and appropriate program for decametric radiosignal propagation conditions prediction for paths from 500 to 9000 km have been developed at ISTP SB on the basis of normal wave method (AltyntsevaB.I,Iliyin N.V., Kurkin V.I. and others //Decameters channel simulation on the base of normal wave method . ... Solar activity indices are chosen automatically from the prediction date from the database . ...

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... This task operates on event data in an event list. ... In the first two cases, the celestial coordinates of the reference point are taken respectively as the values of the RA_NOM , DEC_NOM or RA_OBJ , DEC_OBJ values in the input event file header. ... Although the OM attitude information may be more accurate, it will not be present throughout part of the observation, and as such, the default source for the attitude data should be "ahf". ...

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• Example 1: Point source

... 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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• (Untitled)

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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• Lagrangian Points
• The Lagrangian Point L1
• Trigonometry beyond 90 degrees

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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• Finding Your Way in the Milky Way | Astronotes

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Through improving the search criteria used in Christou (2000b) and numerical integrations of candidate coorbitals, we have identified approximately 51 (44) objects currently in co-orbital libration with Ceres (Vesta). We show that these form part of a larger population of transient coorbitals; 129 (94) MBAs undergo episodes of co-orbital libration with Ceres (Vesta) within a 2 Myr interval centred on the present. ...

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• Explosive Events
• The Human Orrery
• Human Orrery

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. ...

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... 2004 September 19 . Earth's North Magnetic Pole . ... Explanation: A magnetic compass does not point toward the true North Pole of the Earth. Rather, it more closely points toward the North Magnetic Pole of the Earth. ... Evidence indicates that the North Magnetic Pole has wandered over much of the Earth's surface in the 4.5 billion years since the Earth formed. ... Indicated in the above picture is Ellef Ringnes Island , the location of Earth's North Magnetic Pole in 1994. ... About APOD | ...

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• APOD: October 19, 1999 - Earth's North Magnetic Pole
• APOD: 2002 August 18 - Earth's North Magnetic Pole
• APOD: 2000 December 3 - Earth's North Magnetic Pole

... Posts tagged ?breakdown point? ... Tags: biased , breakdown point , chi-square , confidence interval , coverage , delta chi-square , estimator , LAD , mean , median , plug-in , rmse . Category: Bad AstroStat , Cross-Cultural , Data Processing , Jargon , Uncertainty | 2 Comments . ... The breakdown point of the mean is asymptotically zero whereas the breakdown point of the median is 1/2. ... ArXiv] use of the median? Tags: breakdown point , mean , median , quantile . ... Comment . ...

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• The AstroStat Slog Blog Archive [MADS] multiscale modeling
• The AstroStat Slog mean
• The AstroStat Slog median

... What happens if you do a cd (change directory) to this type of directory? ... Look at this example: pwd (print the user's working directory) /usr/home/john/tmp ln -s $HOME/accounts/may fifth (use a symbolic link named fifth that points to the directory $HOME/accounts/may) ls fifth cd fifth (change directory to the new directory) pwd (print the working directory) /usr/home/john/accounts/may (the user is actually in the the directory that the linked directory points to) . ...

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• To define the 'region'
• Understanding UNIX files