![]() ![]() However, followup radial-velocity observations of VB 10b did not detect the signal that would be expected based on the astrometric data, so most researchers consider it another false positive. Chegg angular resolution detect earth astrometry archive#As of February 2020 there is only one confirmed planet on the NASA exoplanet archive which is listed as an astrometric discovery, DENIS-P J082303.1-491201b, also known as VB 10b. Until recently, the level of precision required to detect the slight shifts in a star's position that indicate the presence of a planet was at the outer edge of technological feasibility. The fact that all of these claims, based on decades of meticulous observations, were subsequently cast into serious doubt, testifies to the immense difficulties confronting an astrometric hunt for planets. In 1960 Sproul astronomer Sarah Lippincott published a paper claiming that the star Lalande 21185 was orbited by a planet of roughly ten Jupiter masses, and in 1963 the observatory's director, Peter Van de Kamp, announced the discovery of a planet orbiting Barnard's Star. ![]() The tradition of planet hunting through astrometry nevertheless remained strong at Sproul, where Strand's announcement was followed decades later by two other contentious claims. Although the announcement was greeted with enthusiasm at the time, the claim has remained unproven and astronomers today are highly skeptical of Strand's results. As early as 1943 astronomer Kaj Strand, working at the Sproul Observatory at Swarthmore College announced that his astrometric measurements revealed the presence of a planet orbiting the star 61 Cygni. Astrometry is the oldest method used to search for extrasolar planets. ![]()
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