![]() Crop your image to the region of interest as follows:Ī. If you need to adjust the Scale (brightness) of your image, select Scale – fixed brightness and contrast, and use the scale controls at the bottom to adjust your imageġ1. Use your mouse wheel to zoom in and use your mouse to position the image such that your moving object is centered in the image and it is visibleġ0. Drag the slider located at the bottom of your images to verify that your images are alignedĩ. AstroImageJ will align your images using the three stars as reference starsį. Press Enter on your keyboard once you have selected at least three starsĮ. Select three stars that are visible on all of the images and are relatively clear of your moving object and are mostly alone (not surrounded by other nearby stars)ĭ. Uncheck all options except ‘ Align only to whole pixels’ and ‘ Show help panel during aperture selection’Ĭ. Click the 13th icon from the left (the tooltip says ‘ align stack using apertures’)ī. Drag the scroll bar at the bottom of the image to check the alignment of the images (your images should ideally not shift as you drag the scroll bar I explain how to align your images in the next series of steps)Ī. AstroImageJ imports your sequence of images in chronological order and opens the stackħ. Verify that the number of files is correct in the Sequence Options dialog box and click OkĦ. Select one of the files in the sequenceĥ. Browse to the folder containing your FITS filesĤ. Start with FITS files of your object and ensure you have them all in one folder to make them easier to import using AstroImageJ.ģ. Creating an animated GIF using AstroImageJ ![]() I created this animation using AstroImageJ and GIMP and followed the steps in this tutorial. Just before this asteroid disappeared from our view, it developed a second tail and the Hubble Space telescope caught an image of that. Astronomers think it is rotating at a speed high enough to cause it to break up and the tail you see is the broken-up material. ![]() The tail on this asteroid is being formed because the asteroid is breaking apart. This is an animation of asteroid 6478 Gault taken January 30, 2019: You’ll need both AstroImageJ and GIMP installed on your system to follow these steps. How to add the logo to your animated GIF.How to create an animated GIF using AstroImageJ.Images of asteroids and comets are interesting but are even more so when you can see the object moving against the background stars.
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