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981. A Technique for Determining Proper Motions from Schmidt Plate Scans at ST ScI
... Keywords: Proper Motions, Schmidt Plates, Astrometry, Guide Star Catalog, Palomar Sky Survey . In this paper we describe a program of determining proper motions from digitized scans of 1950's-era Palomar Sky Survey (POSS) Schmidt Plates and 1980's-era Palomar Oschin Schmidt `Quick V' plates that were taken for the Hubble Space Telescope ( HST ) Guide Star Catalogue. ... Arrows indicate the magnitude and direction of the proper motion for the stars. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/williamsonr.html -- 10.9 Кб -- 03.11.2000
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982. Comprehensive Index
. Enter words for search: . This is a WAIS search of the entire contents of all the articles, performed by the wwwwais gateway program. Forms support in your web browser is required. You may use "and" and "or" in a search. For example, compare the results of a search for "midas and aips" to the results of searching for "midas" alone. Author Index . Subject Index . adass4_editors@stsci.edu
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Ссылки http://www.adass.org/adass/proceedings/adass94/windex.html -- 2.2 Кб -- 03.11.2000
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983. MEM Task for Image Restoration in IRAF
... Next: Statistical Analysis Up: Image Restoration and Previous: Restoration of HST . ... This presentation is devoted to the MEM (Maximum Entropy Method) task, version D, for image restoration in IRAF. Described in detail are its enhanced functions of Poisson noise only case handling and subpixelization technique; improved algorithms for maximization including the preconditioned conjugate method, accurate Newton method, the accurate one-dimensional search, and the model updating technique. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/wun.html -- 14.8 Кб -- 03.11.2000
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984. Robust Estimation and Image Combining
... A task GCOMBINE in the STSDAS package, for combining images, is briefly reviewed. With a stack of input images, one can identify bad pixels by comparing the deviation of a pixel from the mean with a user-specified threshold times the clipping sigma. It is crucial that estimation of the mean and sigma be robust against unidentified outliers, in order to reject cosmic ray events effectively. ... By uniform weighting, we mean that the weight is a constant for all pixels in an input image. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/zhangc.html -- 15.8 Кб -- 03.11.2000
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985. Volume Cover
Next: Preface Up: Contents Previous: Contents . Cover Illustration: Two B- band images of the Phoenix dwarf galaxy at different epochs ( top ), and the difference of the two using new software to register and scale the images ( bottom left ) and to match their PSFs ( bottom right ). In the fully matched case about a dozen Cepheid variables are readily apparent, as is one high proper-motion star just below and left of center. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/ -- 3.3 Кб -- 03.11.2000
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass94/cover.html -- 3.3 Кб -- 03.11.2000
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986. Author Index
... Akella, R., 429 . ... Angelini, L., 117 , 219 . ... Binegar, S., 429 . ... Brunner, R. J., 169 . Busetta, M., 383 . ... Butcher, J. A., 211 . ... Cherkauer, K., 272 . Choo, T. H., 429 . ... Connolly, A. J., 169 . ... Corbet, R. H. D., 211 . Corcoran, M., 219 . ... de Carvalho, R. R., 272 . ... Djorgovski, S. G., 272 . ... Favata, F., 383 . Fayyad, U., 272 . ... Freeman, M., 357 . ... Gaetz, T., 357 . ... George, I., 219 . ... Gray, A., 272 . ... Hamabe, M., 173 . ... Hester, T., 429 . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/aindex.html -- 19.6 Кб -- 03.11.2000
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987. Calculating the Position and Velocity Components of HST
... The HST uses an onboard model of its orbit to perform in real-time various control functions relating to spacecraft operations and observation support. ... New coefficients for the ephemeris are updated every other day, and are archived as FITS keywords for each HST observation data set. Using these coefficients,an observer can perform a variety of calibration and characterization calculations relating to the orbital position and velocity of the telescope. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/aket.html -- 12.3 Кб -- 03.11.2000
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988. An Abstract Data Interface
... Next: Proposed FITS Keywords Up: Data Models and Previous: Propagating Uncertainties and . ... The Abstract Data Interface (ADI) is a system within which both abstract data models and their mappings on to file formats can be defined. The data model system is object-oriented and closely follows the Common Lisp Object System (CLOS) object model. ... ADI is a system for defining ``abstract data models.' ... ADI was designed as an object-oriented system where data models are defined as classes. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/alland.html -- 11.6 Кб -- 03.11.2000
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989. What Happened to the Results?
... Even future mission archives tend to concentrate more on what can be extracted out of a proposal or a Guaranteed Time Observation log than the actual extracted science out of the data itself. ... A year later the data is then publicly available. An archive researcher has then to go through a mass of data to find what may be useful without any indication as to what the actual observer's results were while using the data except the proposal, which in most cases is very general. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/ansaris.html -- 8.3 Кб -- 03.11.2000
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990. Robust Data Analysis Methods for Spectroscopy
... This paper describes various methods for the analysis of spectroscopic data, particularly as they relate to wavelength calibration of echelle-format spectra. ... Keywords: spectroscopy, Hough transform, wavelet transform, robust regression, echelle, wavelength calibration . ... Wavelet transform can be useful in complementing robust techniques for multiresolution analysis, and Section 4 presents an application of the Mexican hat transform to the detection of spectral features. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/ballesterp.html -- 14.5 Кб -- 03.11.2000
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991. Application of the Linear Quadtree to Astronomical Databases
... Quadtrees have a wide range of applications, from graphics to image processing to spatial information systems. ... With the advent of the Guide Star Catalog and other large astronomical source lists, an efficient method of storing and accessing such spatial data is necessary. ... We also discuss how the linear quadtree can aid in the correlation of source positions from different astronomical catalogs and how it can be applied to relational databases. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/barrettp.html -- 12.6 Кб -- 03.11.2000
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992. Improvements in Filter Design for Removing Galactic ``Cirrus'' from IRAS Images
... Next: Star Finding and Up: Image Restoration and Previous: Multiresolution and Astronomical . ... Design improvements continue to be made in the filter developed using mathematical morphology principles for the Infrared Astronomical Satellite ( IRAS ) images. The purpose of this filter is to eliminate Galactic cirrus emission from extragalactic fields. ... With an appropriate normalization, the filter curve was applied to each pixel in the image to remove the Galactic cirrus. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/basartj.html -- 11.6 Кб -- 03.11.2000
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993. A Graphical User Interface for a Development Environment (GUIDE)
... GUIDE'' (Graphical User Interface for a Data Environment) is an interactive IDL widget-based package that enables users to retrieve selected sets of satellite instrument data and perform various types of graphical analyses on them, without writing a specialized program. GUIDE simplifies the task of laying out multiple plots on a page by (1) using a page-editor to define and laying out multiple ``panels'' which contain the ``plot objects'', and (2) integrating data retrieval functions. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/bhatnagara.html -- 11.7 Кб -- 03.11.2000
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994. FTOOLS: A FITS Data Processing and Analysis Software Package
... FTOOLS, a highly modular collection of over 110 utilities for processing and analyzing data in the FITS (Flexible Image Transport System) format, has been developed in support of the HEASARC (High Energy Astrophysics Science Archive Research Center) at NASA's Goddard Space Flight Center. ... The FTOOLS software package is designed to be both compatible with IRAF and completely stand alone in a UNIX or VMS environment. ... Figure: FTOOLS Task and Package Design. Original PostScript figure (21 kB) . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/blackburnj.html -- 13.1 Кб -- 03.11.2000
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995. A Test for Weak Cosmic Ray Events on CCD Exposures
... It is notoriously difficult to identify weak cosmic ray events in long exposure observations. ... The method is to compare the probability distribution function (PDF) of cosmic ray events between an observation and a dark frame matched in exposure time. We illustrate the basic idea using dark exposures from a Tek 1024 1024 CCD with varying exposure lengths and read-out times. ... Figure: Histogram of cosmic ray events in a two hour dark frame. ... Original PostScript figure (78 kB) . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/blandhawthornj.html -- 7.9 Кб -- 03.11.2000
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996. Proposed FITS Keywords and Column Headers for ALEXIS Mission Data Files
... We propose a set of standard character strings to be used in FITS files generated by data from the ALEXIS (Array of Low Energy X-ray Imaging Sensors) satellite mission. ... The following is our current proposal for keywords to use for storing raw and processed ALEXIS mission data in FITS format. TELESCOP= 'ALEXIS ' . ... In migrating these existing files to FITS formats, we propose the following non-inclusive list of generic column headers (these will be of the form TTYPE n = ' header ' ). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/blochj.html -- 13.7 Кб -- 03.11.2000
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997. The Hubble Space Telescope Data Archive
... Next: The Hubble Data Up: Archives and Databases Previous: What Happened to . ... We describe recent progress at the Space Telescope Science Institute in the development of the HST Data Archive and of StarView , the user interface to the HST archive system. ... The Hubble Space Telescope ( HST ) Data Archive has been open for archival research since early in 1993. ... A new archive engine, ST-DADS (Space Telescope Data Archive and Distribution Service), is now in use. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/bornek.html -- 15.6 Кб -- 03.11.2000
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998. The Electronic PictureBook and Astronomy's Education Initiative
... The Exploration in Education (ExInEd) program at the Space Telescope Science Institute seeks to promote basic teaching and learning by exploiting the connections between astronomy research and education. Our primary product category consists of Electronic PictureBooks (EPBs): educational show-and-tell software allowing astronomers to communicate their ideas and results to a broad audience. ... ExInEd has also created its first CD-ROM, entitled Space Science Library of Electronic PictureBooks. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/brownr.html -- 17.5 Кб -- 03.11.2000
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999. Modelling Astrophysical Turbulent Convection
... Numerical simulations of highly turbulent flows in astrophysics benefit greatly from recent advances in high performance computing. ... Figure: Perspective full domain view of vertical velocity at one instant in time in 3-D turbulent convection simulation ( ). ... Original PostScript figure (1496 kB) . ... Figure: Phase diagram of pointwise convective flux as function of the vertical velocity in a horizontal plane near midlayer for turbulent convection with , and , with . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/brummelln.html -- 31.6 Кб -- 03.11.2000
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1000. An Object-Oriented Approach to Astronomical Databases
... Next: Data Archive System Up: Archives and Databases Previous: Designing an Open . ... We describe here an implementation of a prototype object-oriented database, distributed in a client-server framework that is capable of both handling these volumes of data and facilitating geometric queries in an efficient manner. ... Our proposed solution is to store the data in an object-oriented database using a multidimensional indexing scheme: the k-d tree. ... Figure: The data flow model. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/brunnerr.html -- 14.3 Кб -- 03.11.2000
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