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WFC3 Instrument Handbook
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Wide Field Camera 3 Instrument Handbookfor Cycle 22 > Glossary

Glossary
The following terms and acronyms are used in this Handbook.
 
ADU: Analog-to-digital Unit
ADC: Analog to digital Converter
ABMAG: –2.5 log (Fν) – 48.60 where Fν is the flux from the source in erg cm–2 sec-1 Hz-1
ABν: Correction to ABMAG to account for the fact that the source spectrum is not constant in Fν (ABMAG=V+ABν)
ACS: Advanced Camera for Surveys
APT: Astronomer’s Proposal Tool
aXe: Spectroscopic Data Extraction Software
BOP: Bright Object Protection
calwf3: WFC3 calibration pipeline software
CCD: Charge Coupled Device. Solid-state, light detecting device
CDS: Correlated Double Sampling
COS: Cosmic Origins Spectrograph
CP: Call for Proposals
CR: Cosmic ray
CR-SPLIT: Division of a CCD exposure into shorter exposures to be used for cosmic ray rejection
CSM: Channel select mechanism
CTE: Charge transfer efficiency
CVZ: Continuous viewing zone
DCL: Detector Characterization Laboratory at NASA GSFC
DN: Data number
DQ: Data quality
EE: Encircled energy
ETC: Exposure Time Calculator. ETCs are Web-based tools which can be accessed through the WFC3 webpages.
FET: Field-effect Transistor
FGS: Fine Guidance Sensors
FITS: Flexible Image Transport System
FOV: Field of view
FPA: Focal-Plane Array
FSM: Filter select mechanism
FWHM: Full width at half maximum
GO: General Observer
GSC: Guide Star Catalog
GSFC: NASA’s Goddard Space Flight Center
Help Desk: Facility for getting help on HST related topics via email. help@stsci.edu.
HRC: High Resolution Channel of ACS (non-operational)
HST: Hubble Space Telescope
IPT: Integrated Product Team
IR: Infrared; also IR channel of WFC3
IRAF: Image Reduction and Analysis System. The environment in which ­STSDAS operates.
ISR: Instrument Science Report. Available at the WFC3 website.
K: Degree Kelvin
MBE: Molecular-beam Epitaxial
MPP: Multi Pinned Phased, a CCD mode that reduces dark current rate
MTF: Modulation Transfer Function
MUX: Multiplexer
NICMOS: Near-Infrared Camera and Multi-Object Spectrograph
NUV: Near ultraviolet (~2000 to 4000 Å)
OTA: Optical Telescope Assembly
PASP: Publications of the Astronomical Society of the Pacific
Phase I proposal: A proposal for observing time on HST
Phase II program: An approved HST program; includes precise detail of how program is to be executed
PI: Principal investigator
POM: Pick- off Mirror
PRF: Pixel Response Function
PSF: Point-spread function.
PyRAF: version of IRAF implemented in the Python language
QE: Quantum Efficiency
ramp: A sequence of non-destructive readouts comprising a single IR exposure
rms: Root mean square
SAA: South Atlantic Anomaly
SBC: Solar-Blind Channel of ACS
SDSS: Sloan Digital Sky Survey
SED: Spectral-energy Distribution
SIAF: Science Instrument Aperture File
SM4: Servicing Mission 4
SMOV: Servicing Mission Observatory Verification
S/N: signal-to-noise ratio
SOFA: Selectable Optical Filter Assembly
SOC: Scientific Oversight Committee
ST-ECF: Space Telescope European Coordinating Facility
STIS: Space Telescope Imaging Spectrograph
STScI: Space Telescope Science Institute
STSDAS: Space Telescope Science Data Analysis System. The complete suite of IRAF data analysis and calibration routines used to process HST data.
synphot: STSDAS synthetic photometry (IRAF) software package
TAC: Telescope Allocation Committee
TEC: Thermal Electric Coolers
UV: Ultraviolet
UVIS: Ultraviolet and Visual (CCD channel of WFC3)
WFC: Wide-Field Channel of ACS
WFC3: Wide Field Camera 3
WF/PC-1: Wide Field Planetary Camera-1. Original on-axis HST camera.
WFPC2: Wide Field Planetary Camera 2. Replacement for WF/PC-1 installed during first servicing mission of December 1993.
 

Wide Field Camera 3 Instrument Handbookfor Cycle 22 > Glossary

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