View source for Astronomy:NGC 1721

{{Short description|Lenticular galaxy in the constellation Eridanus}}
{{Infobox galaxy
| name               = [[Astronomy:New General Catalogue|NGC]] 1721
| image              = File:NGC 1721 NGC 1723 NGC 1725 NGC 1728 legacy dr10.jpg
| image_size         = 250px
| caption            = Galaxy group in Eridanus showing NGC 1721, [[Astronomy:NGC 1723|NGC 1723]], [[Astronomy:NGC 1725|NGC 1725]], and [[Astronomy:NGC 1728|NGC 1728]]. NGC 1721 is the right galaxy in the compact group in the middle.
| credit             = [http://www.kopernik.org/ Kopernik Observatory & Science Center, Vestal NY]
| epoch              = J2000
| pronounce          = <!-- {{IPA-en|  IPA string   |}} -->
| constellation name = [[Astronomy:Eridanus (constellation)|Eridanus]]
| ra = {{RA|04|59|17.4}}<ref name="NED">{{cite web
 | url = http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+1721&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES
 | title = NED results for object NGC 1721
 | publisher = NASA/IPAC Extragalactic Database (NED)
 | access-date = March 15, 2012
 }}</ref>
| dec = {{DEC|-11|07|07}}<ref name="NED" />
| z                  = 0.015010<ref name="NED" />
| h_radial_v         = 4 500 ± 9 km/s<ref name="NED" />
| gal_v              = 4 388 ± 10 km/s<ref name="NED" />
| dist_ly            = {{convert|200|Mly|Mpc|1|abbr=on|lk=on}}<ref name="NED" />
| group_cluster      = 
| type               = (R')SAB0<sup>0</sup>(s)<ref name=NED/>
| mass               = <!-- In solar masses 0{{e|0}}{{Solar mass|link=y|}} -->
| stars              = 
| appmag_v           = 
| size               = 36.92 by 17.58 kpc<ref name="NED" /> 
| notes              = 
| names              = {{odlist|MCG=-02-13-027|PGC=16484}}<ref name=NED/>
| references         = 
}}

'''NGC 1721''' is a [[Astronomy:Lenticular galaxy|lenticular galaxy]] (S0) located in the constellation [[Astronomy:Eridanus (constellation)|Eridanus]]. It was discovered on the 10th of Nov 1885<ref>{{Cite web|url=http://cseligman.com/text/atlas/ngc17.htm#1721|title=cseligman.com}}</ref> by [[Biography:Edward Emerson Barnard|Edward Emerson Barnard]]. This galaxy is a member of the NGC 1723 Group—consisting of [[Astronomy:NGC 1723|NCG 1723]] (the brightest member, 11.7-[[Astronomy:Magnitude|mag]]) and a close triplet of NGC 1721, [[Astronomy:NGC 1725|NGC 1725]] and [[Astronomy:NGC 1728|NGC 1728]].<ref>{{Cite web|url=http://www.deepskypedia.com/wiki/NGC_1723_Group|title=NGC 1723 Group|website=DeepSkyPedia}}</ref>

NGC 1721 is a Dreyer Object (a now archaic astronomical term), meaning that it was included in the original [[Astronomy:New General Catalogue|New General Catalogue]] by [[Biography:John Louis Emil Dreyer|JLE Dreyer]].<ref>{{Cite journal|title=Observations of nebulae with the 36-inch refractor of the Lick Observatory – by S. W. Burnham (Publications of the Lick Observatory)|bibcode = 1894PLicO...2..168B| last1=Burnham | first1=S. W. | journal=Publications of Lick Observatory | year=1894 | volume=2 | page=168 }}</ref>

== References ==
{{reflist}}

== External links ==

{{Sky|04|59|17.4|-|11|07|07|200000000}}

{{DEFAULTSORT:NGC 1721}}
[[Category:Eridanus (constellation)]]
[[Category:Lenticular galaxies]]
[[Category:NGC objects|1721]]
[[Category:Principal Galaxies Catalogue objects|016484]]



{{Sourceattribution|NGC 1721}}