Stellar Help
This GUI allows you to identify stars from images. Since version 9.
Contents
- Control Summary
- Quaternion
- Star Catalog
- Dark File
- Image File
- Identify
- Centroid
- Select Star Catalog
- Select Dark Frame
- Select Image
- Use Intensity
- Show Centroid Images
- Star threshold
- Threshold
- Dot Product Tolerance
- Intensity Tolerance
- Intensity Scale
- Horiz. Pixels/Degree
- Vert. Pixels/Degree
- Centroid List
- Star List
- Using the GUI
- The Process
- Needed Data
Control Summary
Quaternion
Displays the attitude quaternion obtained from the star map.
Star Catalog
Displays the name of the star catalog in use.
Dark File
The file name of the dark frame used to calibrate the images.
Image File
The file name of star image that is to be procesed.
Identify
Identify stars and compute the quaternion. This will only by enabled after the centroid button has been pushed.
Centroid
Identify star centroids.
Select Star Catalog
Select the star catalog. It will bring up a file selection dialog.
Select Dark Frame
Select the dark frame. It will bring up a file selection dialog.
Select Image
Select the star image. It will bring up a file selection dialog.
Use Intensity
When clicked the star id will use intensity information.
Show Centroid Images
This is a toggle button. When pushed it will cause the centroiding software to display the star images.
Star threshold
This is the minimum stellar magnitude of stars that are to be loaded from the database.
Threshold
This is the fraction of the maximum pixel value that will be used to threshold the star image.
Dot Product Tolerance
The tolerance used on dot products when doing star identification.
Intensity Tolerance
The tolerance used on intensity when doing star identification.
Intensity Scale
The scale used to convert pixel output to watts/m^2.
Horiz. Pixels/Degree
The horizontal angular width of a pixel.
Vert. Pixels/Degree
The vertical angular width of a pixel.
Centroid List
List of objects and their centroids from the centroiding algorithm.
Star List
List of identified stars.
Using the GUI
The Process
The steps you take are: a. Select an image file. b. Set the threshold c. Hit "Centroid" d. Select a star catalog e. Enter the CCD parameters f. Hit identify
Needed Data
You need to have the intensity scaling data if you plan to use intensity information. This is most easily done by finding a known star, measuring the output using the centroiding algorithm, and setting the intensity scale. Once this is done you should be able to use the same number for multiple images.
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