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Acronym Guide
This is a description of the acronyms and abbreviations used in this web site.

ACA Aspect Camera Assembly
ACIS AXAF CCD Imaging Spectrometer
ASC AXAF Science Center
ASCA also known as Asuka, Advanced Satellite for Cosmology & Astrophysics, Japanese X-ray satellite
ASCDS ASC Data Analysis System
ASCII American National Standard Code for Information Exchange
AXAF Advanced X-Ray Astrophysics Facility
CDT Central Daylight Time
CfA Center for Astrophysics (Harvard Smithsonian)
CoI Co-Investigator
CR Cosmic Ray
CST Central Standard Time
CXC Chandra X-ray Center
Dec Declination
DSN Deep Space Network
DSS Digitized Sky Survey
EC Ecliptic Coordinates
EDT Eastern Daylight Time
EKC Eastman Kodak Company
EST Eastern Standard Time
FITS Flexible Image Transport System
FOV Field of View
GMT Greenwich Mean Time
GO General Observer
GRO Compton Gamma Ray Observatory
GSFC Goddard Space Flight Center
GSPROPS Guide Star Properties
GTO Guaranteed Time Observer
GUI Graphical User Interface
HEASARC High Energy Astrophysics Science Archive Research Center
HETG High Energy Transmission Grating
HETGS HETG Spectrometer
HP Hewlett-Packard
HQ Headquarters
HRC High Resolution Camera
HRI High Resolution Imager
HRMA High Resolution Mirror Assembly
HST Hubble Space Telescope
ICD Interface Control Document
IDS Interdisciplinary Scientist
IPI Instrument Principal Investigator
IRAF Image Reduction and Analysis Facility
IRAS Infrared Astronomical Satellite
ISAS Institute of Space and Astronautical Science
IUE International Ultraviolet Explorer
JOVE Joint Venture (NASA/Universities)
JPL Jet Propulsion Laboratory
KSC Kennedy Spaceflight Center
LETG Low Energy Transmission Grating
LETGS LETG Spectrometer
MDT Mountain Daylight Time
MEG Medium Energy Grating
MIT Massachusetts Institute of Technology
MSFC Marshall Space Flight Center
MST Mountain Standard Time
NASA National Aeronautics and Space Administration
NASCOM NASA Communication system
NGC New General Catalogue
NRAO National Radio Astronomy Observatory
OBA Optical Bench Assembly
OBSCAT Observing Catalog
OCC Operations Control Center
OCLI Optical Coating Laboratories, Inc.
OS Operating System
PDT Pacific Daylight Time
PI Principal Investigator
PKS Parkes Radio Source
PST Pacific Standard Time
PSU Pennsylvania State University
RA Right Ascension
RF Republique Française
ROSAT Roentgen Satellite
RXJ Rosat X-ray source (J = Julian date 2000 as in Chandra sources)
RXTE Rossi X-ray Timing Explorer
SAO Smithsonian Astrophysical Observatory
SI Science Instrument
SIM Scientific Instrument Module
SN Space Network
SNR Supernova Remnant
SOHO Solar and Heliospheric Observatory
SOP Standard Operating Procedure
SOURCE Science Operations and User Research Central Exchange
STSCI Space Telescope Science Institute
TBD To Be Determined
TBR To Be Reviewed
TS Telescope System, or Telescope Scientist
TT Terrestrial Time
UT Universal Time
UV Ultraviolet
VETA Validation Engineering Test Article (mirror)
VLA Very Large Array
WWW World-Wide Web
XMM High Throughput X-ray Spectroscopy (Mission scheduled for launch in 2000)
XRCF X-ray Calibration Facility
XRS X-Ray Spectrometer
XTE X-ray Timing Explorer
XUV Extreme Ultraviolet