{{Short description|Interacting peculiar spiral galaxy in the constellation Boötes}} {{Notability|1=Astro|date=April 2026}} {{Infobox galaxy | name = NGC 5591 | image = NGC 5591 SDSS2.jpg | caption = NGC 5591 is the galaxy in the center of the image. Image by [[Sloan Digital Sky Survey|SDSS]] | constellation name = [[Boötes]] | epoch = J2000 | ra = 14h 22m 32s | dec = +13° 41' 01" | h_radial_v = 7,541 ± 27 (NGC 5591 NED 1)<ref name="ned">{{cite web |title=NGC 5591 |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+5591&extend=no&out_equinox=J2000.0&list_limit=5&img_stamp=YES |website=NASA/IPAC Extragalactic Database}}</ref> 7,642 ± 27 (NGC 5591 NED 2) | size_v = {{Val|1.3|×|0.6|u= arcminute}}{{r|ned}} | dist_ly = 540 Million Light years | size = ~150,000 [[Light year|ly]] | type = [[Interacting galaxy]] | z = 0.0256{{r|ned}} | appmag_v = 14.5 | notes = | names = {{odlist | UGC= 9207 | Mrk= 809 | PGC= 51368 | MCG= +02-37-005}} }}
'''NGC 5591''' is a [[peculiar galaxy|peculiar]] [[spiral galaxy]], or more precisely an [[interacting galaxy]] pair,{{cn|date=March 2026|reason=where's the evidence these are interacting, as compared to just a line-of-sight pair? I found none.}} 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 {{val|7902|18|u=km/s}}, corresponding to a [[Hubble's law|Hubble distance]] of {{val|116.6|8.2|u=Mpc}}.<ref name="ned"/>
==Observations== In fact, this system is a pair of galaxies<ref name="ned"/> in [[interacting galaxy|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 {{val|116.27|8.14|u=Mpc}}, PGC 93125 is therefore considered a companion galaxy rather than an object in the [[New General Catalogue|NGC catalogue]].<ref name="selig"/>
NGC 5591 exhibits a broad [[21-centimeter line|H I line]].<ref name="ned"/> According to the [[SIMBAD]] database, NGC 5591 is classified as a [[radio galaxy]].<ref name="Simbad"/> 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).<ref name="astroVall"/>
== See also == * [[List of NGC objects (5001-6000)]]
== References == {{Reflist|refs=
<ref name="astroVall">{{cite web |title=Data from the "Revised NGC and IC Catalog" by Wolfgang Steinicke, NGC 5500 to 5599 |url=https://astrovalleyfield.com/AstronomieCompl/NGC%20et%20autres/WolfgangS/N5500_exc_web.htm |website=astrovalleyfield.com |language=fr |access-date=6 January 2024 }}</ref>
<ref name="selig">{{cite web |last=Seligman |first=Courtney |title=Celestial Atlas Table of Contents, NGC 5591 |url=http://cseligman.com/text/atlas/ngc55a.htm#5591 |website=Celestial Atlas |language=en |access-date=28 November 2021 }}</ref>
<ref name="Simbad">{{cite web |title=NGC 5591 - Radio Galaxy |url=https://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+5591 |website=SIMBAD Astronomical Database |publisher=Centre de Données astronomiques de Strasbourg |access-date=27 November 2021 }}</ref>
}}
{{ngc60}} {{Boötes}}
[[Category:Spiral galaxies]] [[Category:Peculiar galaxies]] [[Category:Radio galaxies]] [[Category:Interacting galaxies]] [[Category:Boötes]] [[Category:NGC objects|5591]] [[Category:Principal Galaxies Catalogue objects|51368]] [[Category:UGC objects|9207]] [[Category:MCG objects|+02-37-005]] [[Category:Markarian galaxies|809]] [[Category:Astronomical objects discovered in 1886]] [[Category:Discoveries by Lewis Swift]]