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1041. Exploring Interactive Archive Data Presentation at the COSSC
... Hughes STX/COSSC NASA/GSFC, Greenbelt, MD 20771 . ... The exploration of hypertextual data presentation at the COSSC was facilitated by the creation of tables of data, in electronic form, which describe the BATSE and EGRET datasets available in the Compton Observatory archive. ... As our store of data continues to grow, we will continue to explore new and novel ways in which hypertext allows the data in the COSSC archive to be presented and selected. 56 kB PostScript reprint . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jordanj.html -- 9.9 Кб -- 03.11.2000
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1042. Bias-Free Parameter Estimation with Few Counts, by Iterative Chi-Squared
... We demonstrate through numerical simulations that model parameters estimated with our technique are essentially bias-free, even when the average number of counts per bin is 1. ... The IW technique avoids such biases by estimating through successive iterations, where for each iteration, j, , and the best-fit parameters are determined by minimization of . ... In our sample, we find that the minimum values and best-fit parameters converge after about 6 iterations. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/kearnsk.html -- 12.3 Кб -- 03.11.2000
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1043. An Approach for Obtaining Polarization Information from COBE-DMR
... Because the DMR instrument is differential and every pixel is multiply sampled, sky maps are produced by solving a coupled system of linear equations (the normal equations) to minimize a chi-squared. ... This is reflected in the algebraic form of the normal equations matrix, so that, if one were to diagonalize the matrix, one would find a single eigenvector whose eigenvalue was identically zero, and the associated eigenvector, viewed as a sky map, would have a constant value. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/keegstrap.html -- 12.9 Кб -- 03.11.2000
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1044. A Graphical Planning and Scheduling Toolkit for Astronomical Spacecraft
... A small yet powerful planning and scheduling toolkit has been built for the Submillimeter Wave Astronomy Satellite ( SWAS ) Small Explorer spacecraft. ... The simple design, minimal resource requirements and easy extensibility of the SWAS planning and scheduling toolkit should make it useful for other space astronomy missions. ... The relatively severe time and manpower constraints for the development of the SWAS Planning and Scheduling toolkit have forced it to remain small and simple. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/kleiners.html -- 11.3 Кб -- 03.11.2000
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1045. Simulation of HST PSFs using Tiny Tim
... Tiny Tim has been used for generating Hubble Space Telescope ( HST ) point-spread functions (PSFs) for deconvolution, algorithm testing, proposal planning, and optical studies. ... Tiny Tim is a stand-alone program for simulating HST PSFs as viewed with the on-board imaging cameras (WF/PC-1, WFPC2, FOC, COSTAR/FOC). ... The measured aberrations for FOC f/96, WF/PC-1 PC6, WFPC2, and COSTAR/FOC are used by Tiny Tim . ... Figure: FOC f/96 observed and Tiny Tim model PSFs (pre-COSTAR) at 253 nm. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/kristj.html -- 10.1 Кб -- 03.11.2000
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1046. The IDL Astronomy User's Library
... Code 681, NASA/GSFC, Greenbelt, MD 20771 . IDL (Interactive Data Language) is a commercial plotting, image processing, and programming language that is widely used in astronomy. ... Therefore, in 1990 I created the IDL Astronomy User's Library (AUL), which is a collection of astronomy-related procedures written in the IDL language, available via anonymous FTP from idlastro.gsfc.nasa.gov . ... I then mention some additions to the IDL Astronomy Library since the previous report of Landsman (1993). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/landsmanw.html -- 14.1 Кб -- 03.11.2000
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1047. Cheating Poisson: A Biased Method for Detecting Faint Sources in All-Sky Survey
... One approach to compiling a catalog of point sources from all-sky survey data is to apply a source detection algorithm to the entire data set and include in the catalog any location whose significance exceeds some minimum value. ... If one has some prior knowledge of where the real sources are likely to be found, it is possible to ``cheat Poisson'' and include these sub-threshold sources without introducing significant numbers of spurious detections. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/lewisj.html -- 15.7 Кб -- 03.11.2000
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1048. Discrimination of Point-like Objects in Astronomical Images using Surface
... A new method for the discrimination of point-like objects in astronomical images is presented. The method makes use of the surface curvature of the image, without any a priori knowledge of the shape of the point-like objects. ... We propose a new approach to the problem based on the properties of surface curvature which is related to peaks, pits and flats in images and therefore contain the key information to discriminate point-like objects. ... The image of means is called the analysis image. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/llebariaa.html -- 15.6 Кб -- 03.11.2000
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1049. MACSQIID: A package for the reduction of data from the SQIID Infrared Camera
... The SQIID camera was developed at NOAO's Kitt Peak National Observatory to provide multi-band infrared imaging. ... We have developed a software package to facilitate the reduction of data from this instrument for this purpose. ... This package uses the stability of the camera to construct flat field calibrations over several nights. ... We have developed a software package to facilitate the reduction of data from the NOAO SQIID (Simultaneous Quad-color Infrared Imaging Device) camera (Ellis et al. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/mackentyj.html -- 15.8 Кб -- 03.11.2000
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1050. Classification of Objects in the Guide Star Catalog
... Next: Object Detection Using Up: Object Detection and Previous: Automated Classification of . ... A status report of the The GSC Object Classifier (GOC) project is presented. ... The GSC contains multiple entries for some objects due to plate overlap. It classifies objects as stars, non-stars, galaxies, blends and potential artifacts; the latter three classifications are rare, and only exist in GSC version 1.1, to which they were added manually. ... star, . ... non-star, . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/malkovo1.html -- 10.6 Кб -- 03.11.2000
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1051. GUIDARES: Reading the Guide Star Catalog in Very Many Ways
... Malkov, O. M. Smirnov . ... We present some current and future variations of our Guide Star Catalog Data Retrieval Software (GUIDARES). ... The GUIDARES software was born in 1991 (Malkov et al. 1992) as a PC-based tool for easy access to the Guide Star Catalog. ... Several applications arose (e.g., Malkov & Smirnov 1994b) where it was very useful for a program to be able to read the Guide Star Catalog easily, without the burden of sorting through its (very complicated) internal structure. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/malkovo2.html -- 9.6 Кб -- 03.11.2000
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1052. Applying Public Access Programming Techniques To SAOimage
... This paper describes our application of the X Public Access ( XPA ) interface to the new version of SAOimage . XPA allows an Xt program to define named public access points through which data and commands can be exchanged with external programs. ... It provides a high-level image display programming interface as well as low-level access to gterm-image widget functions. ... When a new file name is sent to SAOtng , the appropriate header access program is run to gather the overall image dimensions. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/mandele.html -- 11.7 Кб -- 03.11.2000
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1053. QPSIM: An IRAF/PROS Tool for Source Simulation
... The generation of simulated sources whose physical properties are well understood is useful in assessing the functionality of point source analysis software. Qpsim is an IRAF/PROS task which will generate events from sources of given intensity, shape, and position and either overlay them on a flat background in a new QPOE file or inject them into an existing QPOE file. ... The simulated data can be a useful tool in calibrating point source analysis software. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/manningk.html -- 11.9 Кб -- 03.11.2000
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1054. The World Wide Web: Cornerstone of the EUVE Science Archive
... The Science Archive for the Extreme Ultraviolet Explorer ( EUVE ) satellite is using the World Wide Web (WWW) client/server software model as the cornerstone for the dissemination of EUVE archival material. A number of on-line services are available for accessing the large amounts of EUVE data that have been released publicly in the past year; additional services provide access to EUVE -related software and information. ... One such innovative idea is the use of the World Wide Web (WWW). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/mcdonaldk.html -- 14.3 Кб -- 03.11.2000
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1055. Propagating Uncertainties and Units in Data Structures
... Next: An Abstract Data Up: Data Models and Previous: What is an . ... We describe a possible data structure designed to improve propagation of physics information in an analysis system, and an associated subroutine library for combining physical units. ... It has the size and shape of the physical data array, and its pixel values represent the exposure time for that element of the array. ... A Unit handling library parses physical unit definitions, and provides simple routines to combine them. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/mcdowellj.html -- 12.0 Кб -- 03.11.2000
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1056. EMSAO: Radial Velocities from Emission Lines in Spectra
... Many extragalactic objects for which radial velocities are desired display strong emission lines. ... EMSAO, a companion to the cross-correlation task XCSAO (Kurtz et al. 1992), was written to find emission lines automatically, compute redshifts for each identified line, and combine them into a single radial velocity. ... Figure: This EMSAO Summary page shows line centers and fit information for a night sky spectrum. ... To test EMSAO adequately, a lot of emission line spectra were needed. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/minkd.html -- 11.7 Кб -- 03.11.2000
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1057. The ASC Pipeline: Concept to Prototype
... Discusses the role of a pipeline in the AXAF Science Center Data System. Due to the complexity of the application, a prototyping effort was initiated to evaluate the risks involved with portability, open architecture, error handling/recovery, and distributed processing. Processes in the pipeline are initiated and monitored by a process control application developed using Perl. ... During that time, a Process Control application was developed to allow us to assess the risk factors. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/mistrya.html -- 11.5 Кб -- 03.11.2000
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1058. Restoration of HST WFPC2 Images in Gyro-Hold Mode
... Next: MEM Task for Up: Image Restoration and Previous: RegisteringPSF-Matching and . ... In gyro-hold tracking mode, HST is stabilized only with its gyros, and the Fine Guidance Sensors are not used to maintain pointing. ... Experiments have been done on WFPC 2 images of NGC 330 and NGC 422 (having exposure times of 80 and 100 s in gyro-hold mode) with complete success. ... An NGC 422 WFPC 2 WC2 image and an NGC 330 WFPC 2 PC1 image were taken in mode FSGLOCK = GYROS in 1994 January. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/moj.html -- 10.9 Кб -- 03.11.2000
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1059. WIP -- An Interactive Graphics Software Package
... WIP is an interactive package with a simple to use interface designed to produce high quality graphical output. WIP was developed as part of the Berkeley-Illinois-Maryland Association (BIMA) project and is available via anonymous ftp. ... Included in the WIP distribution is a complete manual which contains several sample figures with associated commands, a frequently asked questions section, and a descriptive listing of all available commands. ... Figure illustrates WIP's ability to handle images. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/morganj.html -- 11.8 Кб -- 03.11.2000
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1060. Accessing the Digitized Sky Survey
... The Digitized Sky Survey is now available on CD-ROMs and will be on the ST ScI archive. ... ST ScI has digitized Schmidt plates of the entire Sky. ... The software then accesses the data, decompresses the scans and returns the data in a form of a photographic intensity as a function of x and y plate pixel coordinates. ... accesses the Digitized Sky Survey (DSS) CD ROMs and decompressed the data returning a photographic intensity as a function of x and y pixel coordinates. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/morrisonj.html -- 8.3 Кб -- 03.11.2000
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