NGC 5042

{{Short description|Galaxy in the constellation Hydra}} {{Use dmy dates|date=February 2025}} {{Infobox Galaxy | name = [[New General Catalogue|NGC]]{{nbsp}}5042 | image = NGC 5042 Imaged by the Hubble Space Telescope.jpg | caption= NGC{{nbsp}}5042 imaged by the [[Hubble Space Telescope]] | alt = Image Description: A spiral galaxy. It’s noticeably bright around the central region of its disc, then dims somewhat out to the edge where there are fewer stars. Two spiral arms circle through the disc and emerge beyond its edge, around the galaxy’s sides. Many pink spots of new star formation, as well as dark reddish strands of dust, cover the galaxy. The arms contain some speckled, blue patches containing hot stars. | epoch = [[J2000]] | constellation name = [[Hydra (constellation)|Hydra]] | ra = {{RA|13|15|31.1269}}<ref name="ned">{{cite web | website = NASA/IPAC Extragalactic Database | publisher = [[NASA]] and [[California Institute of Technology|Caltech]] | title=Results for object NGC 5042 | url = https://ned.ipac.caltech.edu/byname?objname=NGC+5042 | access-date = 28 February 2025}}</ref> | dec = {{DEC|-23|59|00.958}}{{r|ned}} | z = 0.004637{{r|ned}} | h_radial_v = {{val|1390|1|u=km/s|fmt=commas}}{{r|ned}} | dist_ly = {{convert|14.680 ± 0.726|Mpc|Mly|abbr=on|lk=on|order=flip}}{{r|ned}} | group_cluster = | type = SAB(rs)c{{r|ned}} | size = ~{{convert|24.77|kpc|ly|abbr=on|lk=on|order=flip}} (estimated){{r|ned}} | appmag_v = 11.8{{r|ned}} | size_v = {{Val|4.2|×|2.2|u=arcminute}}{{r|ned}} | notes = | names = {{odlist | UGCA= 340 | name= ESO 508- G 031 | MCG= -04-31-043 | PGC= 46126 | IRAS= 13127-2343}}{{r|ned}} }} {{Sky|13|15|31.1269|-|23|59|00.958}} '''NGC{{nbsp}}5042''' is an [[intermediate spiral galaxy]] in the [[constellation]] of [[Hydra (constellation)|Hydra]]. Its velocity with respect to the [[cosmic microwave background]] for is {{val|1697|22|u=km/s|fmt=commas}}, which corresponds to a [[Hubble's law|Hubble distance]] of {{convert|25.03 ± 1.78|Mpc|Mly|abbr=on|lk=on|order=flip}}.{{r|ned}} However, 15 ''non redshift'' measurements give a much closer distance of {{convert|14.680 ± 0.726|Mpc|Mly|abbr=on|lk=on|order=flip}}.<ref>{{cite web | url = https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+5042 | title = Distance Results for NGC 5042 | website = NASA/IPAC EXTRAGALACTIC DATABASE | publisher = [[NASA]] | access-date = 28 February 2025}}</ref> It was discovered by British astronomer [[John Herschel]] on 25 March 1836.<ref name="selig">{{cite web | url = https://cseligman.com/text/atlas/ngc50.htm#5042 | title = New General Catalogue Objects: NGC{{nbsp}}5042 | last = Seligman | first = Courtney | website = Celestial Atlas | access-date = 28 February 2025}}</ref>

The [[Hubble Space Telescope|Hubble Space Telescope's]] image of NGC{{nbsp}}5042 shows its collection of [[H II region]]s, brilliant pink gas clouds in its spiral arms, getting their color from hydrogen atoms that have been ionized by ultraviolet light. Many of these clouds are associated with groups of blue stars, often appearing to form a shell around them.<ref>{{cite web | url= https://esahubble.org/images/potw2509a/ | title = A spiral of the water snake | website = ESA/NASA Hubble | publisher = [[NASA]] and the [[European Space Agency]] | access-date = 28 February 2025}}</ref>

==Image gallery== <gallery> File:NGC 5042 PanS.jpg|NGC{{nbsp}}5042 imaged by [[Pan-STARRS]] </gallery>

== See also == * [[List of NGC objects (5001–6000)]]

==References== {{reflist}}

==External links== * {{commons category-inline}} {{WikiSky}}

[[Category:NGC objects|5042]] [[Category:IRAS catalogue objects|13127-2343]] [[Category:Principal Galaxies Catalogue objects|046126]] [[Category:MCG objects|-04-31-043]] [[Category:Hydra (constellation)]] [[Category:Intermediate spiral galaxies]] [[Category:UGCA objects]] [[Category:ESO objects|508- G 031]] [[Category:Discoveries by John Herschel]] [[Category:Astronomical objects discovered in 1836|18360325]]