NGC 5591
NGC entry
NGC 5591 is a peculiar spiral galaxy, or more precisely an interacting galaxy pair, located in the constellation of Boötes, located around 540 million light years away. It was discovered by the American astronomer Lewis Swift in 1886. Its velocity relative to the cosmic microwave background is 7902±18 km/s, corresponding to a Hubble distance of 116.6±8.2 Mpc.
Observations
In fact, this system is a pair of galaxies in gravitational interaction consisting of NGC 5591 and PGC 93125. However, Swift’s description (very faint, small, and round) suggests that he observed only NGC 5591. At a distance of 116.27±8.14 Mpc, PGC 93125 is therefore considered a companion galaxy rather than an object in the NGC catalogue.
NGC 5591 exhibits a broad H I line. According to the SIMBAD database, NGC 5591 is classified as a radio galaxy. NGC 5591 is a galaxy whose nucleus shines in the ultraviolet region of the spectrum. It is listed in the Markarian Catalogue under the designation Mrk 809 (MK 809).
The public source identifies “NGC 5591” as nGC entry. This brief keeps that definition visible, then builds a research path around entry.
Why this record matters
A short description can identify a subject without explaining its stakes. For “NGC 5591”, the useful work is to connect “nGC entry” to the records capable of establishing context and consequence.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 3, 2026. The linked authority identifier is Q1121262. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1886.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. 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.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “NGC 5591”, its source revision and the description used here.
- Expand the search: follow NGC 5591 primary sources, NGC 5591 archive and entry 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
- Which source most directly establishes the central claim about “NGC 5591”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “NGC 5591” 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.