The Cycle 11 calibration program will be defined a few months after the Phase II deadline for approved programs. ... In special situations it is possible that observers may find the STScI calibration programs do not meet their needs. ... In these cases observers may propose to obtain their own calibration data. ... During Cycles 9 and 10, two WFPC2 Calibration Outsource programs were awarded. ... Results of both programs will be disseminated via the WFPC2 WWW site, as results become available. ...

Next: Self-Calibrating with Multiple Models Up: Computation Previous: Computation . Both selfcal and gpscal produce antenna gain tables in the same format as the calibration tasks previously described. ... Finally, if the primary gains have appreciable XY phase (for any antenna for selfcal , but for the reference antenna only for gpscal ), or significant amplitude gain mismatches (for selfcal only) then these corrections should be applied to the data before self-calibration. ...

... The routine processing of STIS data in the calibration ``pipeline" requires an interrelated set of software tasks and databases developed and maintained by many groups at STScI. We present the systems-level design of this calibration pipeline from the perspective of the STIS instrument group at STScI. We describe the multiple interfaces to the pipeline processes that the STIS group works across in an effort to provide for the routine calibration of STIS data. ... For example, the STIS group: . ...

... In , the visibility amplitudes and phases of the program stars are calibrated using calibrator stars, for which those variables are modeled and the resulting model coefficients transferred to the program star data. ... When calibrating the data, the user should begin by looking at the calibrated and normalized amplitudes first to see whether the data has already been calibrated (for example when a .cha file was read). ... In the case of visibility phases, there are no normalized quantities.) ...

... A data set contains a science frame, all its associated raw calibration frames and the master calibration frames created by combining and processing the raw calibration frames. ... Either one creates a MIDAS catalogue which contains the names of all single calibration frames to be combined in to the master frame, or, in the case of pipe line reduction, one use the Association Table. ... The names of single calibration frames are however also available in the Association Table. ...

... the alfa calibration results (.ps) ( .pdf ): . the pointing error vs rotation angle offset (.ps) ( .pdf ): . ... Comparing the two lets you separate out the alfa installation errors with general telescope pointing problems (from the beam repair). ... Part of the pointing error could come from the alfa rotation angle being off. ... Compute the change in the pointing error if the alfa rotation error was off by -5 to +5 degrees in .1 degree steps. ... Top: rms pointing error vs rotation angle offset. ...

Next: The STScI NICMOS Calibration Up: No Title Previous: CONICA: The high resolution . The STScI NICMOS Calibration Pipeline . Introduction . ... Dark Current Subtraction . ... Input Data . ... Scalar Background Subtraction . 2-D Background Subtraction . ... Status and Goals of the NICMOS Calibration Plan . ... Photometry . ... Photometric Performance of NICMOS . ... NICMOS Photometry. ... ST-ECF Grism Spectrum Software for NICMOS Grism Data . ... Analysis . ... STScI NICMOS Software . ...

... Class . ... Packages that use Calibration . ... TextEncoder ( ImageProcessor ip, Calibration cal, int precision) . Constructs a TextEncoder from an ImageProcessor and optional Calibration. ... ImageStatistics. getStatistics ( ImageProcessor ip, int mOptions, Calibration cal) . ... ByteStatistics ( ImageProcessor ip, int mOptions, Calibration cal) . ... ColorStatistics ( ImageProcessor ip, int mOptions, Calibration cal) . ... FloatStatistics ( ImageProcessor ip, int mOptions, Calibration cal) . ...

... Phase Correction Algorithms | ... This page describes work undertaken at the Cavendish Astrophysics Group , developing phase correction algorithms and software for the Atacama Large Millimetre Array (ALMA). Without correction, phase fluctuations, mainly arising from the water content of the atmosphere, would limit ALMA's performance . ... The following people are currently involved in the phase calibration workpackage, based at the Cavendish Astrophysics Group in the University of Cambridge : . ...

Next: Vignetting correction Up: Spatial Analysis Previous: *imcontour* - Iso-intensity contour . In order to perform detailed analysis on an x-ray field, a user will need to access the various calibration files, apply corrections for vignetting and propagate errors. Vignetting correction . makevig, vigdata* - Apply Vignetting Correction to an image . ... Background Corrections . imcalc* - Obtain a background subtracted image for ROSAT PSPC Data . ... To Resample Calibration Images . ...

... Flats : Properly exposed flats over all echelle orders require a two-step process. Flats are taken both with and without a CuSO4 (aka "blue") filter in the beam. ... Suggested exposures are 7 seconds ("red"; no filter) and 240 seconds ("blue", CuSO4 filter) yielding S/N values of ~480. The filter for "blue" flats is listed as "blue" in the Config window in Echelle control under Remark. ... Exposure times for objects can be derived from the following plot: . ...

... Credit: AAVSO Explanation: Humanity's understanding of the relative brightness and variability of stars was revolutionized by the work of Henrietta Swan Leavitt (1868-1921). Working at Harvard College Observatory , Leavitt precisely calibrated the photographic magnitudes of 47 stars to which all other stars could be compared. ... Publications with keywords: scientist - Henreitta Leavitt - star . Publications with words: scientist - Henreitta Leavitt - star . ... The Quintuplet Star Cluster . ...

... 2000 September 3 . Henrietta Leavitt Calibrates the Stars . ... Explanation: Humanity's understanding of the relative brightness and variability of stars was revolutionized by the work of Henrietta Swan Leavitt (1868-1921). ... Leavitt discovered and cataloged over 1500 variable stars in the nearby Magellanic Clouds . From this catalog, Leavitt discovered that brighter Cepheid variable stars take longer to vary, a fact used today to calibrate the distance scale of our universe . ...

... Created: 22 January 2001 . ... SERVICE AND CALIBRATION MANUAL . ... Draft Document Outline. ... 4 Preparing NIFS for Use or Storage . ... The purpose of this Service and Calibration Manual is describe the procedures used to service, maintain, and calibrate the operation of the Gemini Near-infrared Integral Field Spectrograph. ... Section 19.4.2 of the document “Programmatic Requirements for Gemini Instrumentation Development” states the requirements for the Service and Calibration Manual . ...

... Published spectra . Published k-corrections (Bessel & Brett filters) . K-corrections using CIT filters . Filters used for the integration: U B V Rc Ic J CIT H CIT K CIT . Filters used for the k-corrections: J BB H BB K BB . New calibration of the spectra: set the desidered colors (Johnson BV- Cousins RI- CIT JHK) in the table below, press "SUBMIT" and save the output as text file. ... Spectra of individual galaxies ( calibrated in lambda and flux and normalized to average=1) . ...

Test stand for geometrical calibration of imaging cameras . determination of the elements of internal orientation for imaging cameras as well as the parameters of mutual orientation of the internal and instrument coordinate systems . Test stand for photometric calibration of imaging spectrometric cameras . determination of the spectral and radiance characteristics of the imaging systems . ... Test stand for determining radiation stability of components . ...

... Left: A POSSM plot of the uncalibrated spectrum of DA 193 at 1.66 GHz on a baseline Bear Lakes to Noto. ... The phase slope as a function of frequency is clear evidence for a small delay error in the correlator model. Right: The same data as shown on the left, but corrected for a delay error and a residual fringe rate. ... Left: A VPLOT plot of the uncalibrated amplitude (upper frame) and uncalibrated phase (lower frame) as a function of time for the source DA 193 on a baseline HartRAO to Noto. ...

. MFSpromcalib_manual.pdf . Author of the procedure: Pavol Schwartz (pschwartz@astro.sk) .

Next: Correlator Products . Previous: RSOG Post-Observation Products . ... Merged Correlator Input Log . Calibration and Flag files . SRT Amplitude Calibration Data . ... Phase Calibration (PCal) Data . ... DPC to Correlators . What: The RSOG produces the `merged' correlator input log file based on the Data Processing Logs supplied by the GTSs and on Executed Sequence of Events supplied by GOCG to produce a single correlator input log for all the GTSs for each observation. ...