NGC 5172

{{Short description|Galaxy in the constellation Coma Berenices}} {{Use dmy dates|date=November 2025}} {{Infobox Galaxy | name = [[New General Catalogue|NGC]] 5172 | image = NGC 5172 SDSS2.jpg | caption = NGC 5172 imaged by [[Sloan Digital Sky Survey|SDSS]] | alt = | epoch = [[J2000]] | constellation name = [[Coma Berenices]] | ra = {{RA|12|29|19.3104}}{{r|ned}} | dec = {{DEC|+17|03|06.901}}{{r|ned}} | z = {{val|0.013443|0.00000300}}{{r|ned}} | h_radial_v = {{val|4030|1|u=km/s|fmt=commas}}{{r|ned}} | dist_ly = {{convert|50.477 ± 3.572|Mpc|Mly|abbr=on|lk=on|order=flip}}{{r|ned}} | group_cluster = | type = SAB(rs)bc{{r|ned}} | size = ~{{convert|51.39|kpc|ly|abbr=on|lk=on|order=flip}} (estimated){{r|ned}} | appmag_v = 12.63{{r|ned}} | size_v = {{Val|3.3|×|1.7|u=arcminute}}{{r|ned}} | notes = | names = {{odlist | 2MASX= J13291914+1703061 | CGCG= 101-057 | IRAS= 13268+1718 | MCG= +03-34-041 | PGC= 47330 | UGC= 8477}}{{r|ned}} }}

'''NGC 5172''' is an [[intermediate spiral galaxy]] in the [[constellation]] of [[Coma Berenices]]. Its velocity with respect to the [[cosmic microwave background]] is {{val|4308|19|u=km/s|fmt=commas}}, which corresponds to a [[Hubble's law|Hubble distance]] of {{convert|63.53 ± 4.46|Mpc|Mly|abbr=on|lk=on|order=flip}}.{{r|ned}} However, 13 ''non-redshift'' measurements give a closer mean distance of {{convert|50.477 ± 3.572|Mpc|Mly|abbr=on|lk=off|order=flip}}.{{r|ned-distance}} It was discovered by British astronomer [[John Herschel]] on 7 May 1826.{{r|selig}}

NGC 5172 has a possible [[active galactic nucleus]], i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.{{r|AGN|SIMBAD}}

According to Abraham Mahtessian, NGC 5172 and {{ill|NGC 5190|fr}} form a pair of galaxies.{{r|mahtessian}}

==Supernovae== Two [[supernova]]e have been observed in NGC 5172: * '''SN 1998cc''' ([[Type Ib and Ic supernovae|Type{{nbsp}}Ib]], mag. 18.1) was discovered by the [[Lick Observatory]] Supernova Search (LOSS) on 15 May 1998.{{r|IAUC6907|TNS-1998cc}} * '''SN 2001R''' ([[Type II supernova|Type{{nbsp}}II]], mag. 18.5) was discovered by LOTOSS (Lick Observatory and [[Tenagra Observatories|Tenagra Observatory]] Supernova Searches) on 6 January 2001.{{r|IAUC7579|TNS-2001R}}

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

==References== <references>

<ref name=ned>{{cite web | website = NASA/IPAC Extragalactic Database | publisher = [[NASA]] and [[California Institute of Technology|Caltech]] | title = Results for object NGC 5172 | url = https://ned.ipac.caltech.edu/byname?objname=NGC+5172 | access-date = 30 November 2025}}</ref>

<ref name=ned-distance>{{cite web | url = https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+5172 | title = Distance Results for NGC 5172 | website = NASA/IPAC Extragalactic Database | publisher = [[NASA]] | access-date = 30 November 2025}}</ref>

<ref name=selig>{{cite web | url = https://cseligman.com/text/atlas/ngc51a.htm#5172 | title = New General Catalogue Objects: NGC 5172 | last = Seligman | first = Courtney | website = Celestial Atlas | access-date = 30 November 2025}}</ref>

<ref name=AGN>{{cite journal|last1=Asmus |first1=D. |last2=Greenwell |first2=C. L. |last3=Gandhi |first3=P. |last4=Boorman |first4=P. G. |last5=Aird |first5=J. |last6=Alexander |first6=D. M. |last7=Assef |first7=R. J. |last8=Baldi |first8=R. D. |last9=Davies |first9=R. I. |last10=Hönig |first10=S. F. |last11=Ricci |first11=C. |last12=Rosario |first12=D. J. |last13=Salvato |first13=M. |last14=Shankar |first14=F. |last15=Stern |first15=D. |title=Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC |journal=Monthly Notices of the Royal Astronomical Society |date=2020 |volume=494 |issue=2 |page=1784 |doi=10.1093/mnras/staa766 |doi-access=free |arxiv=2003.05959 |bibcode=2020MNRAS.494.1784A}}</ref>

<ref name=SIMBAD>{{cite simbad | title=NGC 5172 | access-date=30 November 2025}}</ref>

<ref name=mahtessian>{{cite journal|doi=10.1007/BF03036100 | title=Groups of galaxies. III. Some empirical characteristics | date=1998 | last1=Mahtessian | first1=A. P. | journal=Astrophysics | volume=41 | issue=3 | pages=308–321 | bibcode=1998Ap.....41..308M}}</ref>

<ref name=IAUC6907>{{cite journal |last1=Li |first1=W. D. |last2=Modjaz |first2=M. |last3=Treffers |first3=R. R. |last4=Filippenko |first4=A. V. |last5=Jha |first5=S. |last6=Garnavich |first6=P. |last7=Kirshner |first7=R. |last8=Berlind |first8=P. |title=Supernova 1998cc in NGC 5172 |journal=International Astronomical Union Circular |date=1998 |issue=6907 |page=1 |bibcode=1998IAUC.6907....1L | url = http://www.cbat.eps.harvard.edu/iauc/06900/06907.html#Item1}}</ref>

<ref name=TNS-1998cc>{{cite web | website=Transient Name Server | title= SN 1998cc | url= https://www.wis-tns.org/object/1998cc | publisher= [[International Astronomical Union|IAU]] | access-date= 30 November 2025}}</ref>

<ref name=IAUC7579>{{cite journal |last1=Weisz |first1=D. |last2=Modjaz |first2=M. |last3=Li |first3=W. D. |title=Supernova 2001R in NGC 5172 |journal=International Astronomical Union Circular |date=2001 |issue=7579 |page=1 |bibcode=2001IAUC.7579....1W | url = http://www.cbat.eps.harvard.edu/iauc/07500/07579.html#Item1}}</ref>

<ref name=TNS-2001R>{{cite web | website=Transient Name Server | title= SN 2001R | url= https://www.wis-tns.org/object/2001R | publisher= [[International Astronomical Union|IAU]] | access-date= 30 November 2025}}</ref>

</references>

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

[[Category:NGC objects|5172]] [[Category:MCG objects|+03-34-041]] [[Category:Principal Galaxies Catalogue objects|047330]] [[Category:IRAS catalogue objects|13268+1718]] [[Category:UGC objects|08477]] [[Category:Coma Berenices]] [[Category:Intermediate spiral galaxies]] [[Category:Astronomical objects discovered in 1826|18260507]] [[Category:Discoveries by John Herschel]]