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Present day searches for exoplanets are insensitive to exoplanets located at the distances from their host star comparable to the semi-major axes of the gas giants in the Solar System, greater than about 5 AU.
In the 1960s astronomer Peter van de Kamp claimed that he had discovered a planet orbiting Barnard's Star using astrometry.
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They repeated the astrometry measurements made by van de Kamp with improved equipment and failed to detect any sign of Barnard's Star companions.