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| | Van der Kamp, Peter (1901-1955) |
 | | In 1937, using a technique brought to Sproul by Kaj A. Strand, he initiated a search for unseen companions of 54 stars known to lie within 16 light-years (5 parsecs) of the Sun (see stars, nearest). |
| | Over the next two decades, the Sproul group, which also included Sarah Lee Lippincott, reported evidence for planetary bodies around several of the target stars, including 61 Cygni, Ross 614, and Lalande 21185. |
| | In 1963, van de Kamp claimed that a giant planet, about 11 times the mass of Jupiter, was in a 24-year orbit around Barnard's Star, |
| www.daviddarling.info /encyclopedia/V/vanderKamp.html (401 words) |
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