Satellite Photo
The Satellite Photo widget on the toolbar shows a thumbnail image of the currently selected satellite:

The image is taken from the SatNOGS satellite database. Hover the mouse cursor over the thumbnail to see the satellite name as a tooltip.
The widget is empty when the selected satellite has no image available in the database.
Image Cache
Downloaded thumbnails are cached on disk so they only need to be fetched once. The cache
is kept in the sat_images sub-folder of the Data Folder. You may delete
this folder at any time to force SkyRoof to re-download the images.
Visibility
The widget hides itself automatically when the main window is too narrow to fit all of the other toolbar widgets. Resize the main window wider to bring it back into view.