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Glossary

The following terms and acronyms are used in this manual.

A/D or ADC: Analog to digital converter.

AEDP: Astrometry and Engineering Data Processing.

CADC: Canadian Astronomical Data Center.

CCD: Charge-coupled device. Solid-state, light detecting device.

CDBS: Calibration Data Base. System for maintaining reference files and tables used to calibrate HST observational datasets.

C&DH: Control and Data Handling.

CL: Command language. The IRAF system-level prompt.

COSTAR: Corrective Optics Space Telescope Axial Replacement.

CTE: Charge transfer efficiency.

CVC: Current to voltage converter. Used with HSP.

DADS: Data Archive and Distribution System.

DAT: Digital audio tape.

DC: Dark current.

DMF: Data Management Facility. Used for archiving HST data.

DN: Digital number.

DQ: Data quality.

DQE: Detector quantum efficiency.

DQF: Data quality file.

EBS: Electron Bombarded Silicon.

EED: Extracted engineering data.

ESA: European Space Agency.

FDA: Field Divider Assembly (NICMOS).

FES: Fine error signal (used with FGS).

FFT: Fast Fourier transform.

FGE: Fine Guidance Electronics. (Used with FGS).

FGS: Fine Guidance Sensors.

FITS: Flexible Image Transport System. A generic IEEE- and NASA-defined standard used for storing image data.

FOC: Faint Object Camera.

FOM: Field Offset Mechanism.

FOS: Faint Object Spectrograph.

FOV: Field of view.

FTP: File Transfer Protocol. Basic tool used to retrieve files from a remote system. Ask your system manager for information about using FTP.

FWHM: Full width at half maximum.

GCI: Geocentric inertial.

GEIS: Generic Edited Information Set. The multigroup format used by STSDAS for storing HST image data.

GHRS: Goddard High-Resolution Spectrograph.

GIF: Graphic Interchange Format. Data format developed by -CompuServe for storing and transporting image data. Supported by Mosaic and xv for use over Internet.

GIM: Geomagnetically-induced motion problem. Formerly a correction in the FOS calibration pipeline, now applied on the spacecraft.

GO: General Observer.

Gopher: Hypertext-oriented software developed at University of Minnesota for retrieving information through the Internet.

GPB: Group parameter block.

GSC: Guide Star Catalog.

GTI: Good time interval.

GTO: Guaranteed Time Observer.

HDU: Header Data Unit.

HSP: High-Speed Photometer.

HST: Hubble Space Telescope.

HTML: Hypertext Markup Language.

Hz: Hertz. Cycle per second.

ICD: Interface control document. Defines data structures used between software or systems to ensure compatibility.

ICF: Intrinsic correlation function.

IDL: Interactive Data Language.

IDT: Investigation Development Team.

IFOV: Instantaneous field of view.

IFT: Inverse Fourier transform.

IGI: Interactive Graphics Interpreter. Graphics program in STSDAS.

imset: Image set (STIS and NICMOS).

IPPPSSOOT: HST file naming convention to uniquely identify files (described in Appendix B).

IR: Infrared.

IRAF: Image Reduction and Analysis System. The system on which STSDAS is built.

IUE: International Ultraviolet Explorer.

JPL: Jet Propulsion Laboratory, located at California Institute of Technology in Pasadena. Home of WF/PC team.

K: Degree Kelvin.

LOS: Line of sight.

LSA: Large science aperture. One of two apertures on GHRS.

LVPS: Low-voltage power supply.

mas: Milliarcsecond.

MEM: Maximum Entropy Method. Algorithm for restoring images.

MIE: MAMA Interface Electronics.

MIF: Multiple Initial and Final (readouts, NICMOS).

MJD: Modified Julian date.

MOSS: Moving Object Support System.

ND: Neutral density.

NICMOS: Near Infrared Camera and Multi-Object Spectrometer.

NOAO: National Optical Astronomy Observatories.

OCX: Observer comments file from OSS. Contains updated mission information obtained when the observation is taken.

OFAD: Optical field angle distortion.

OIF: Old IRAF (data format).

OMS: Observatory Monitoring System.

OPUS: OSS and PODPS Unified Systems.

OTA: Optical telescope assembly.

OV: Orbital verification. Process of checking out equipment on HST.

PC: Planetary Camera; part of WF/PC.

PCS: Pointing Control System.

PDA: Photon Detector Assembly (in FOC).

PDB: Project Data Base.

PDQ: PODPS data Quality file. Contains predicted and actual observation parameters.

PI: Principal investigator.

pipe: To use the output from one task or program as the input to another task or program. The output of a STSDAS or IRAF task can be piped to another task.

PMT: Photomultiplier tube.

pset: Parameter set (IRAF).

PSF: Point spread function.

RA: Right ascension.

R-L: Richardson-Lucy. Algorithm for restoring images.

rms: Root mean square.

RSDP: Routine Science Data Processing. The basic calibration (pipeline) system used for processing all HST observation datasets.

RTB: Return-to-brightest. Target acquisition mode for GHRS.

SAA: South Atlantic Anomaly.

SDF: Science Data Formatter.

SHL: Science header line.

SHP: Standard header packet. File containing spacecraft information from time of observation.

SM97: 1997 Servicing Mission.

SMOV: Servicing Mission Orbital Verification.

S/N: Signal-to-noise ratio.

SOGS: Science Operations Ground System.

SSA: Small science aperture. One of two apertures on GHRS; the other is LSA.

ST-ECF: Space Telescope European Coordinating Facility.

STAN: Space Telescope Analysis Newsletter.

STARCAT: System used for retrieving archived HST data. To be replaced by StarView in 1994.

STEIS: Space Telescope Electronic Information System. The anonymous FTP host from which information, software, documentation, and other resources pertaining to the HST can be obtained.

STIS: Space Telescope Imaging Spectrograph.

STL: Science trailer line.

STScI: Space Telescope Science Institute.

STSDAS: Space Telescope Science Data Analysis System. The complete suite of data analysis and calibration routines used to process HST data.

SV: Science verification. Process of taking observations that can be used for HST instrument calibration.

TEC: Thermal electric cooler. Part of WF/PC.

TF: Transfer function.

TFMRP: Transfer Function Mode Reduction Package. Used with respect to FGS.

TIFF: Tagged Image File Format. Method of storing images, usually from a scanner.

TIM: Telescope Image Modeling. Software used to generate PSF.

UDL: Unique data log. File containing instrument command settings.

URL: Uniform resource locator. Address for WWW.

UT: Universal time.

UV: Ultraviolet.

VPU: Video processing unit.

WAIS: Wide-Area Information Server. Method of locating information on a network using indexes to files.

WCS: World Coordinate System.

WFC: Wide Field Camera. One of the two cameras in WF/PC.

WF/PC: Wide Field/Planetary Camera.

WFPC2: Wide Field Planetary Camera-2. Replacement for WF/PC installed during first servicing mission of December 1993.

world coordinates (WC): The coordinate system naturally applying to the data, pixels or wavelength, for example.

WWW: World Wide Web. Hypertext-oriented method for finding and retrieving information over the Internet.

ZD: Zenith distance.



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