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Contents
Contents
GCX User's Manual
Radu Corlan
Version 0.7.6 December 7, 2004
Contents
Introduction
Features
Free Software
Contributing
About this Manual
Related Projects
Getting Started
Building and Running gcx
Starting with gcx
Navigating the Image
Examining the FITS Header
Stars
World Coordinate System
Aperture Photometry
Going Further
Image Files
FITS Header fields
Viewing Image Files
Saving and Exporting Images
Stars and Catalogs
Star Detection
Loading Catalog Stars
Object Catalogs
Field Star Catalogs
Star Files
Setting up Catalogs
Setting up GSC
Setting up Tycho2
Setting up Object Catalog Files
World Coordinates
World Coordinate System Parameters
World Coordinate System States
Obtaining an Initial WCS
Fitting the WCS to an Image
WCS Fitting Commands
CCD Reduction
CCD Camera Response Model
Bias and Dark Frames
Working without Bias Frames
Flat-field Frames
Reducing the Data Frames
Frame Combining Methods
CCD Reduction with gcx
Loading and Selecting Image Frames
Creating a Master Bias or Master Dark Frame
Creating a Bias-Subtracted Master Dark Frame
Creating a Master Flat Frame
Reducing the Data Frames
Aligning and Stacking Frames
Running CCD Reductions from the Command Line
Aperture Photometry
Measuring Apertures
Sky Estimation
Placing the Apertures
Finding the Ensemble Photometry Solution
Annotations
Running Aperture Photometry
Creating Recipy Files
Target Stars
Standard Stars
Creating the Recipy File
Working without an Image Frame
Creating Recipies from the Command Line
Multi-Frame and All-Sky Reduction
Color Transformation Coefficients
Transforming the Stars
All-Sky Reduction
Extinction Coefficient Fitting
Calculating Zero Points
Running Multi-Frame Reduction
Specifying Reduction Bands
Loading Report Files
Fitting Individual Zero Points
Plots
Fitting Color Transformation Coefficients
All-Sky Reduction
Reporting
Noise Modelling
CCD Noise Sources
Noise of a Pixel Value
Dark Frame Subtraction
Flat Fielding
Instrumental Magnitude Error of a Star
Robust Averaging
Native Star Files
Command Line Options
Report Converter
Global Options
File and Device Options
Serial line for gps receiver control
Command for uncompressing files
Command for compressing files
Gnuplot command
Monospaced Font
Phot report file
Obs files search path
Rcp files search path
GSC location
Tycho2 location
Catalog files
Preload catalogs
Edb directory
Aavso validation file
Force unsigned FITS
Western longitudes
Report converter output format
Auto-unload frames
New frame width
New frame height
New frame scale
Merge positional tolerance
Fits Field Names
Fits field for X coordinate of reference pixel
Fits field for Y coordinate of reference pixel
Fits field for WCS R.A. of reference pixel
Fits field for WCS Dec of reference pixel
Fits field for degrees/pixel in R.A.
Fits field for degrees/pixel in dec
Fits field for field rotation
Fits field for equinox of WCS
Fits field for equinox of WCS
Fits field for object name
Fits field for object R.A.
Fits field for object dec
Fits field for image scale
Fits field for field center
Fits field for field center
Fits field for filter name
Fits field for exposure time
Fits field for julian date of observation
Fits field for modified julian date of observation
Fits field for date/time of observation
Fits field for time of observation
Fits field for telescope name
Fits field for focus designation
Fits field for telescope aperture
Fits field for focal length
Fits field for instrument name
Fits field for observer name
Fits field for latitude of observing site
Fits field for longitude of observing site
Fits field for altitude of observing site
Fits field for airmas
Fits field for sensor temperature
Fits field for horisontal binning
Fits field for vertical binning
Fits field for horisontal window origin
Fits field for vertical window origin
Fits field for electrons per ADU
Fits field for average bias of frame
Fits field for readout noise
Fits field for multiplicative noise coefficient
General Observation Setup Data
Latitude of observing site
Longitude of observing site
Altitude of observing site
Observer name
Observer code
Telescope name
Telescope focal length
Flipped field
Telescope aperture
Focus designation
List of filters
Status window pop-up
Telescope control options
Serial line for telescope control
Serial line for filter wheel control
Eastern limit for goto ops (hour angle)
Enable eastern limit
Western limit for goto ops (hour angle)
Enable western limit
Southern limit for goto ops (degrees)
Enable southern limit
Northern limit for goto ops (degrees)
Enable northern limit
Abort obscript gotos that cause a meridian flip
Mount speed when centering (times sidereal rate)
Mount speed when guiding (times sidereal rate)
Use timed centering moves for small slews
Precess coordinated sent to the scope to the epoch of the day
Amount of gear play we take out at the end of slews (degrees)
Mount stabilisation delay (ms)
Amount of pointing dither between frames (arcmin)
Enable pointing dithering
Max error we accept in telescope pointing (degrees)
Guiding options
Guiding algorithm
Reticle size
Centroid area radius
Guide box size
Guide box zoom
CCD Reduction options
Minimum backgound sigmas
Method used for stacking frames
Iteration limit for stacking operations
Clipping sigmas for mmedian and k-s
Run CCD reductions automatically on frame display
Star Detection and Search Options
Star Detection SNR
Maximum Detected Stars
Maximum Catalog Stars
Faintest Magnitude for Catalog Stars
Maximum Radius for Catalog Stars
Wcs Fitting Options
Scale tolerance
Star position tolerance
Rotation tolerance
Minimum number of pairs
Max skip
Maximum pairs
Min A-B distance
Max error for WCS validation
Min pairs for WCS validation
Scale change per iteration
Default image scale
Aperture Photometry Options
Radius of central aperture
Inner radius of sky annulus
Outer radius of sky annulus
Center apertures
Max centering error
Discard unlocated standards
Max center distance
Sky method
Sigmas
Saturation limit
Instrumental band
Force iband
Default catalog error
Alpha
Beta
Multi-Frame Photometry Options
Bands setup
Outlier threshold
Zeropoint outlier threshold
Minimum airmass variance
Minimum airmass variance
Airmass range
Airmass maximum range
Limiting magnitude from zeropoint
Star Display Options
Label Target Stars
Label Catalog Objects
Label Standard Stars
Standard Star Label Band
Minimum star size
Maximum display star size
Default display star size
Display pixels per magnitude
Brightest symbol magnitude
Display limiting magnitude
Show fainter stars
Zoom star shapes
Star shapes zoom limit
Plot error scale
Star Display Colors
Autodected Stars Color
Field Stars Color
Standard Stars Color
Target Stars Color
Catalog Objects Color
User-Marked Stars Color
Align Stars Color
Selected Stars Color
Star Display Shapes
Autodected Stars Shape
Field Stars Shape
Standard Stars Shape
Target Stars Shape
Catalog Objects Shape
User-Marked Stars Shape
Align Stars Shape
About this document ...
Radu Corlan 2004-12-07
