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