Next: *ltcplot* - Plot the Up: Counting rate vs. time Previous: Counting rate vs. time . Produce a light curve for the source at 6940 9390, using timesorted QPOE file . input file: rp90_sti.qp . ... xt> ltcurv # In the timing package Input Source Timing File: rp90 # Only the root name is needed, # the default extension is known Input Background Timing File (NONE): <cr> # No bkg data rootname for output file: rp90 or . will assign same root name Number of Bins: 500 # 500 data bins xt> . ...

Please enter the lightcurve file name and period search parameters: . Lightcurve file: . ... Apply the Heliocentric correction and convert all dates to Terrestrial Time (TT)? ... Also, the Heliocentric correction cannot be applied to such lightcurves. ... This period search service is also available at the mirror sites: Mirror 1 , Mirror 2 , Mirror 3 , Mirror 4 . You may download the latest source code distribution and install the period search service at your own web server. ...

... Light curve extraction is controlled by setting the parameter rateset , which is the name of the output file containing the ligh curve. Light curves are OGIP compliant histogram files of counts as a function of time. ... The bin size is set with the parameter timebinsize . ... As with images, rather than just accumulating counts in each bin of a light curve, one can sum up the values of a another column in the input table, by specifying the name of the column in the parameter zcolumn . ...

... As described in "Tabular Storage of STIS Data" on page 20-5 , raw time-tagged Sdata are stored in an event table which contains separate columns for the x and y pixel coordinates and the arrival time of each detected photon event. ... Generate a series of ACCUMulated images from user specified time intervals of data and then process the image(s) with calstis . ... The default behavior for inttag is to accumulate all events from the table, writing the results as one image set in the output FITS file....

Next: Analysis in the Up: MIDAS utilities for Previous: Fourier analysis . For the detection of smooth signals, e.g. sinusoids, use either SCARGLE/TSA or AOV/TSA with bins. ... SCARGLE/TSA -- . Scargle sine model: This command computes Scargle's (1982) periodogram for unevenly spaced observations x . ... In this way, the command can be used to perform a CLEAN-like analysis manually by removing individual oscillations one by one in the time domain (see Roberts et al. ... AOV/TSA -- . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Our Galaxy . ... Stars . ... Space Flight . ... New observations with the European Southern Observatory (ESO)тАЩs Very Large Telescope of some of the most distant galaxies ever detected are revealing the mysteries of this important phase of the early Universe. ... These powerful instruments are essential for exploring this early period in cosmic history as they alone can enable the accurate observations of €аthese extremely distant and faint galaxies. ...

... total pwr in range vs ipp images . ... pol1 is the pol we started with. ... I was trying to write these times down as they happened. looking at some of the total power plots, it looks like some of the times were recorded were not correct (signal appears when hf off). ... To see when things happened, i made images of total pwr (in rang) vs time for each data file . ... The title of each image contains the start time (ast) as well as the state of hf xmiter when the file started. 5 sigma images . ...

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... For SIMS (Secondary Ion Mass Spectrometry) analysis, a solid surface is bombarded by primary ions of some keV energy. ... The subsequent mass analysis of the emitted ions provides detailed information on the elemental and molecular composition of the surface. ... Extremely short ion pulses with a duration below . ... By rastering a fine-focussed ion beam over the surface, like an electron beam in an electron microprobe, mass resolved secondary ion images (chemical maps) can be obtained...

... Up: Real-Time Systems . ... The Rossi X-ray Timing Explorer ( RXTE ) spacecraft contains a large Proportional Counter Array (PCA) experiment which produces high count rates for many X-ray sources. ... This allows opportunity for some serious real time interpretation and decision making by the experiment controller, duty scientist, and Guest Observer (GO), if present. ... This paper briefly describes the available Science Monitoring subsystem display options. ...

. Please, enter light elements for your star and Julian Day interval. HJD0: . Period: . JD1: . JD2: .

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

... Basic time functions . ... Example 2: Set a random number seed . ... Uses of time functions include: . ... time_t time(time_t *tloc) -- returns the time since 00:00:00 GMT, Jan. 1, 1970 , measured in seconds. ... timer.c */ #include <stdio.h> #include <sys/types.h> #include <time.h> main() { int i; time_t t1,t2; (void) time(&t1); for (i=1;i<=300;++i) printf(``%d %d %d n'',i, i*i, i*i*i); (void) time(&t2); printf(`` n Time to do 300 squares and cubes= %d seconds n'', (int) t2-t1); } . ...

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... Data dimen: 90 # # #translated to LF by G.V.Lipunova #LF = log flux #flux = erg/cm^2/sec #1=TJD 2=V 3=err 4=B-V 6=V,LF 7=V-errors,LF #1(JD-2440000) 2,3,4=(mag) # 1 2 3 4 6 7 2660.653 11.59 0.2 0.21 -10.12661 0.08 2676.627 11.86 0.07 0.26 -10.23461 0.028 2679.621 11.96 0.07 0.18 -10.27461 0.028 2690.676 11.90 0.07 0.3 -10.25061 0.028 2691.634 11.86 0.07 0.15 -10.23461 0.028 2717.539 12.57 0.07 0.04 -10.51861 ...

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE ANCIENT UNIVERSE . c) The Age of Light from the Most Distant Galaxies: The "Time Machine" Effect . ... Thus we are actually seeing these galaxies not as they are today, but as they were billions of years ago. ... The Universe: An Overview | ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...

... Classes . ... casa::PrecTimer . ... Precision timer to measure elapsed times in a cumulative way. More... #include < PrecTimer.h > . ... The PrecTimer supplements the Timer class. ... Get the real time (in seconds). void casa::PrecTimer::print_time . ... Show real time on cout or a user supplied stream. void casa::PrecTimer::show . ... Show real time on cout or a user supplied stream preceeded by the string parameter. void casa::PrecTimer::start . ... long long casa::PrecTimer::total_time . ...

Trace: q3c . start : q3c . ... SAI VO Projects . ... Help on Wiki search . ... dropdb q3ctest createdb q3ctest psql q3ctest /usr/local/pgsql/share/contrib/ q3c .sql psql q3ctest /usr/local/pgsql/share/contrib/pg_sphere.sql \timing on DROP TABLE running_ q3c ; DROP TABLE running_pgsphere; CREATE TABLE running_ q3c (id INT, ra FLOAT, dec FLOAT); CREATE INDEX running_ q3c _idx ON running_ q3c ( q3c _ang2ipix(ra, dec)); CREATE ... SAI VO | ... SAI MSU | ...

Astronomy Picture of the Day . ... Spanning about 1/2 degree on the sky, the pretty picture is the result of astronomer Johannes Schedler's project to look back in time, toward a quasar 12.7 billion light-years away . ... Of course, the expansion of the Universe has redshifted the light. Schedler added image data extending to the near-infrared, acquired by collaborator Ken Crawford, to detect the distant quasar, with a measured redshift of 6.04. ... Publications with keywords: quasar - redshift . ...

A computer controlled low light photometer for nightglow observations. Hardware units of portable photometer for low light measurements, especially night glow emission is described. ... Interface card contain three channels of 24 bit counter, 4 channels of 12 bit ADC and the buffer bus for the controlled motors of the altazimuthal fork mounting and filters wheel, the position encoders. ... Where N( ) is output signal photometer generated input light flux F( l ) . ... PMT # . 599 . ...