Xi Aquilae
star in the constellation Aquila
Xi Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from ξ Aquilae, and abbreviated Xi Aql or ξ Aql. The star has the official name Libertas, pronounced , a Latin word for liberty. Based on parallax measurements, it is located at a distance of 186 light-years (57 parsecs) from the Sun. This is an aging giant star that is close to a billion years old.
A companion star has been detected using speckle interferometry 0.09″ away.
As of 2008, an extrasolar planet has been confirmed in orbit around the star. Designated Xi Aquilae b, this massive world was later named Fortitudo.
Nomenclature
ξ Aquilae (Latinised to Xi Aquilae) is the star's Bayer designation. Following its discovery the planet was designated Xi Aquilae b.
Begin with the source’s own compact description: “Xi Aquilae” is star in the constellation Aquila. The dossier treats that line as a proposition to test through Aquilae, star and constellation, not as a finished interpretation.
Why this record matters
The phrase “star in the constellation Aquila” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Feb 16, 2026. The linked authority identifier is Q1509518. The first chronological checks are 2008.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
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The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
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- Expand the search: follow Xi Aquilae primary sources, Xi Aquilae archive and Aquilae research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Xi Aquilae” 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.