Next: Combining Bias Frames Up: Preparing Your Calibration Previous: Input and Output . Except for summing the frames together, combining frames may require correcting for variations between the frames due to different exposure times, sky backgrounds, extinctions, and positions. ... The input frames are combined by applying a sigma clipping algorithm at each pixel. ... The input frames are combined with a variant of the sigma clipping algorithm which works well with only a few frames. ...

... The NICMOS data reduction and calibration pipeline employs file formats and software architecture techniques that are new and different from what has been used for previous HST instruments. This paper describes the FITS file format used for NICMOS data, which includes error estimate and data quality arrays for each science image, and describes the approach used to associate multiple observations of a single target. ... This group of five data arrays is called an image set, or ``imset'' for short. ...

... Using the Echelle with TUI . Using the Echelle with Remark . ... Configuring TUI to use the Echelle . Setting up the Echelle exposure parameters . ... Focusing the Echelle . ... Changing the echelle guider filters . ... Configuring Remark to use the Echelle . ... Echelle User's Manual . ... The Echelle home page is http://astro.uchicago.edu/echelle . ... Echelle Description . ... Enclosure . ... schematic CAD files . schematic PDF files . ... enclosure wiring schematic . ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

Next: Setting the Rest Frequency Up: Spectral Line Data Reduction Previous: Listing and Plotting Velocity . Although atlod or fits is the best place to set the velocity information, this can also be handled by the task uvredo . This task recomputes a number of the `derived' quantities (such as observatory radial velocity) which are stored in a visibility dataset. You have to select uvredo 's velocity option, and set the keyword velocity to indicate the rest frame to be used. ... UVREDO . ...

... First, we computed the mean errors of orbit parameters on the assumption of the linear connection of them with observation errors and then we compared obtained estimates with those resulting from the assumption of the nonlinearity of this connection. Secondly, we correlate orbital parameters and their errors obtained by the method of the least modulus with those obtained by the least-squares method. ...

... Archives . ... On the other hand, CHASC scientists relate more general and broad statistical inference problems in estimating the intensity map, like intensity uncertainties at each point and the scientifically informative display of the intensity map with uncertainty according to the Poisson count model and constraints from physics and the instrument, where the field, multiscale modeling is associated. As the post title [MADS] indicates, no abstract has keywords multiscale modeling. ...

Computer Ephemeris . ... Content of the Computer Ephemeris is the same as content of Soviet Astronomical Almanac (Ezhegodnik), but fully original algorithms and computer methods of calculations were used. Your requests for Computer Ephemeris for years before 2014 and your comments on its contents please direct to the author charlie@mail.univ.kiev.ua . ... Keywords: Computer Ephemerides, Computer Ephemeris, Computer Almanac, Computer Calendar. ...

The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...

On/off position switching on continuum sources was done at 2380 Mhz with the sband narrow receiver and the correlator. ... Use the total power information, cal values, and source flux to compute tsys, gain, sefd. Fit the data to a function of (az,za). ... Include losses from pitch, roll, and focus. ... Tsys - fit. ... These plots take a closer look at the average gain fit and how the azimuth terms of the fit compare to the azimuth terms of the gain loss computed from pitch,roll, and focus. ...

... 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 : . ...

Organiser: Xavier Caruso (CNRS, Poncelet Laboratory) . ... Isogenies are an essential tool in Elliptic Curves cryptography, where they are used in a wide variety of area: fast point counting, complex multiplication methods.. V lu's formulas give an efficient method for computing such isogenies, but there were no known formulas for computing isogenies for hyperelliptic curves of higher genus, except in particuliar cases. ... Poncelet Laboratory web page . ...

... Colors of Sunlight . S-4A.Color Expts. ... Here is your opportunity to demonstrate the three-color theory by using your computer. I am indebted for this to Joe Burns , on whose color demonstration file it is based. ... You see below two tables with colored fields. ... blue . ... D0FBFF gives the intensity of the three colors which make up the background: D0 is the intensity of red , FB is the intensity of green and the second FF is the intensity of blue , the maximum blue you can get. ...

ON THE IMPACT OF THE GALACTIC ABERRATION ON VLBI-DERIVED PRECESSION MODEL Z.M. MALKIN Pulkovo Observatory Pulkovskoe Ch. ... Corrections to adopted precession rate are usually computed from the linear trends in long-term time series of celestial pole offset (CPO), which are the differences between the measured and the theoretical coordinates of the celestial pole. ... CONCLUSIONS We have estimated the impact of GA on parameters of precession-nutation model derived from VLBI observations. ...

... Dr. Ravil Nazirov is the head of the workshop, and Andrew Ananjev is the secretary of the workshop. ... The workshop is used to be held in the last decade of the month, preferably on Tuesdays. ... The next session will take place October 29, 1996 . ... There is "CONPAS" mailing list which you can join to discuss issues of problem solving and to be automatically notified of important dates and decisions with respect to the coming sessions. ... Secretary of the Workshop: Andrew Ananjev . ...

COLOR PRINT OF NGC 4881 AND PART OF THE SURROUNDING FIELD This photo mosaic, which shows a field of distant galaxies, is a computer enhanced reproduction of a picture taken 4 March 1994 with the repaired Hubble Space Telescope. ... It is a 13th-magnitude elliptical galaxy in the outskirts of the Coma Cluster, a great cluster of galaxies more than 5 times farther away than the Virgo Cluster. ... We must find that peak ("turnover") in NGC 4881 in order to judge the distance. ...

... Thomson's multiple window method of spectral estimationthomson provides a very good estimate of the power spectrum by measuring the energy contained within a collection of rectangular shaped frequency intervals. ... Often, much of the fine structure of a spectral estimate is due to noise. It should be stressed that while other methods of spectral estimation (such as the Welchoppenheim method) exist, the Thomson method is particularly noteworthy for its precisely defined rectangular frequency bins. ...

... SCIENCE AND BUSINESS . Such a trifle as a starry night sky of largest observatories turned out to be a small change coin in commercial bargains for exclusive communal services in Russia, and for a few elite flats in penthouses in Ukraine. SCIENCE AND BUREAUCRATISM . ... Till in Russian) . ... Clericalization of science and education (Till in Russian). ... Researcher of the Sternberg Astronomical Institute, The Moscow University. ... SAI home page . ... October, 2008) . ... November, 2007) . ...

Armagh Observatory, 21 December 2001: . ... The Armagh Observatory's contribution, led by astronomers Simon Jeffery and Gerry Doyle , is to develop new computational tools to study the atmosphere of the Sun and other stars. ... Computers will communicate with one another using the grid, and computing power will become a commodity just like electricity. ... FOR FURTHER INFORMATION CONTACT: Simon Jeffery or Mark Bailey at the Armagh Observatory (Tel.: ... WWW contact: webmaster@star.arm.ac.uk . ...

... Meade Instruments Corporation . ... Autostar Computer Controller Instruction Manual . Autostar Computer Controller . ... NOTE: This manual covers both Model #495 Autostar and #497 ETX Autostar Computer Controllers. ... Autostar Primary Menus and Options . ... Chapter 3: Alignment . ... Guided Tour Menu . ... Chapter 5: Autostar Menu Functions . ... Meade Autostar Computer Controller . ... Meade #505 Connector Cable Set Manual . ... Copyright 2006 Meade Instruments Corporation, All Rights Reserved. ...