This section lets you go through some of the
functions without reading the rest of the manual, just to get some
overview of the available functions.
Apart from a working
fitsblink program you also need the
example images which are distributed together with both binary and
source version. In the
examples directory you will find the
98kd3r5-98kd3r6.inp 98kd3r5.dat 98kd3r5.fts 98kd3r6.dat 98kd3r6.fts coordinates
Go to the
you installed the RPM package) directory and start
$HOME/.fitsblinkrc file does not exist yet,
fitsblink will complain. Just press the OK button and
from the Astrometry menu choose the Settings item.
Set all of the settings and save them by pressing the Save
button. Next time you run
fitsblink it should not complain
anymore about the missing parameter file.
98kd3r5.ftsfile from the file selector. The image will be loaded and displayed in the blink window. Repeat this procedure with the
98kd3r6.ftsfile. Now you have two images in the memory and you can blink them just by pressing the Blink button. The images will be alternately displayed on the screen. You can adjust the blinking frequency with the Delay counter. You noticed that the images are not aligned perfectly. So, center a star in the left small window with the magnified image and double-click on it. Four cursor buttons will appear. Click on them until small images are aligned and then press the button with a blue circle. The images will be aligned now. If you look for moving objects, you will find one right to the center of the screen. To stop blinking, press Blink again.
As soon you detect stars, you can also get their positions by pressing
the RIGHT mouse button when you are close to one of the DETECTED
objects. A window with a magnified part of the image around the
object position will appear. You will get object x and ycoordinates, as well as object intensity, all in pixel units. If the
WCS values are present in the image header or if you made a successful
match with catalog stars, you will also see the object's celestial
coordinates. For the example image
coordinates of the moving object are:
There is another way to get object coordinates: choose the Do astrometry item. You will see the cursor change shape into a cross. Now press the LEFT mouse button on a selected object. An astrometry report window will appear and if you are happy with the measurement, type in the object name and press Accept. For more details about this, see sections 12.3 and 12.6.
After you detect objects and make a match to the catalog stars, it is possible to check the star catalog numbers. They will appear in the object field after you click on a star. Note that the star will not be identified if it does not lie within the distance from the detected object set in the Options window, which defaults to 1 arcsecond. This especially comes into account for the saturated stars which cause blooming.
For the identification of asteroids you need access to the services
provided by the program
asteroid_server, written by the same
fitsblink. There are two uses. One is when you
click on a detected object and a small window containing the magnified
image of an object appears. Inside this window there is a button
Identify. After you press it,
fitsblink asks the
asteroid_server to send the data for all asteroids within the
given distance. It then presents a list of these asteroids together
with the distances from the detected object so you can transfer the
designation of the (most likely) the closest asteroid to the
Object field. More about the
asteroid_server in the
Another interesting feature of
fitsblink are markers. You
already saw them if you detected stars and matched them with a
catalog. You can find some examples of the use of markers in the file
98kd3r5-98kd3r6.inp. From the command line run
fitsblink -i 98kd3r5-98kd3r6.inp and see what happens.
This concludes the quick overview of the main