ESA's Gaia Just Took a Picture of L2 Neighbor JWST - By Nancy_A
Oh, hello there new neighbor! In February, the Gaia spacecraft took a picture of its new closest companion in space at the second Lagrangian point, the James Webb Space Telescope.by surveying the motions of more than a thousand million stars. Astronomers for the mission realized that once JWST reached L2, it would be in Gaia’s field of view. It spied JWST when the two spacecraft were a million km apart.
A few weeks before Webb’s arrival at L2, Gaia astronomers Uli Bastian of Heidelberg University and Francois Mignard of Nice Observatory realized that during Gaia’s continuous scanning of the entire sky, its new neighbor should occasionally cross Gaia’s fields of view. JWST appears as a tiny speck of light, as astronomers said that very little reflected sunlight came Gaia’s way from the new telescope.
Every six hours, Gaia’s sky mapper scans a narrow 360-degree strip around the entire celestial sphere. The successive strips are slightly tilted with respect to each other, so that every few months the entire sky is covered, with Gaia gathering data on everything that’s bright enough to be seen by the spacecraft’s instruments.
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