We are just five days away from the July 12th release of the first full-color images from NASA’s James Webb Space Telescope, but how does the observatory find and lock onto its targets? Webb’s Fine Guidance Sensor (FGS) was designed with this particular question in mind. (The FGS, as well as the Nea
This Fine Guidance Sensor test image was acquired in parallel with NIRCam imaging of the star HD147980 over a period of eight days at the beginning of May 2022. This engineering image represents a total of 32 hours of exposure time at several overlapping pointings of the Guider 2 channel. The observations were not optimized for the detection of faint objects, but nonetheless, the image captures extremely faint objects and is, for now, the deepest image of the infrared sky.
Even though the FGS’s primary purpose is to enable accurate science measurements and imaging with precision pointing, it has always been capable of capturing imagery. When it does, the imagery is usually not kept: Given the limited communications bandwidth betweenand Earth , Webb only sends data from up to two science instruments at a time.
The resulting engineering test image has some rough-around-the-edges qualities to it. It was not optimized to be a science observation; rather, the data was taken to test how well the telescope could stay locked onto a target, but it does hint at the power of the telescope. It carries a few hallmarks of the views Webb has produced during its postlaunch preparations.
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