55 Cancri Ad
extrasolar planet
55 Cancri Ad (abbreviated 55 Cnc Ad), formally named Lipperhey , is an extrasolar planet in a long-period orbit around the Sun-like star 55 Cancri A. If confirmed, it would be at a similar distance from its star as Jupiter is from the Sun, and the fifth and outermost known planet in its planetary system. 55 Cancri Ad was discovered on June 13, 2002.
Name
In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Lippershey for this planet. The winning name was submitted by the Royal Netherlands Association for Meteorology and Astronomy of the Netherlands. It honors the spectacle maker and telescope pioneer Hans Lippershey. In January 2016, in recognition that his actual name was Lipperhey (with Lippershey an error introduced in the 19th century), the exoplanet name was corrected to Lipperhey by the IAU and that name was submitted to the official sites that keep track of astronomical information.
Discovery
Like the majority of known extrasolar planets found at the time, 55 Cancri Ad was detected by observing changes in its star's radial velocity. This was achieved by making sensitive measurements of the Doppler shift of the star's spectrum.
“55 Cancri Ad” enters the record as extrasolar planet. Crown Archives preserves that source wording while asking what Cancri, extrasolar and planet can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 9, 2026. The linked authority identifier is Q50667. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2002, 2014, 2015 and 2016.
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This entry incorporates text from “55 Cancri Ad” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.