AstroPeek

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Easily preview the field of view you'd get of a deepsky object! Simply highlight either the name of an object (Orion Nebula) or the object's classification (M42) and a tooltip will be shown with the preview. Make sure to set your field of view first by click on the extension. The images are courtesy of Strasbourg astronomical Data Center and their API which can be found at https://alasky.cds.unistra.fr/hips-image-services/hips2fits

Screenshots from Chrome Web Store