NGC 231

{{short description|Open cluster in the constellation Tucana}}

{{Infobox open cluster

| name = NGC 231

| epoch = J2000

| ra = {{RA|00|41|06.4}}{{cite web

| title=NASA/IPAC Extragalactic Database

| work=Results for NGC 0231

| url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+231&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

| access-date=2016-09-02}}

| dec = {{DEC|-73|21|09}}

| constellation = Tucana

| dist_ly = ~210000

| appmag_v = 12.87{{cite simbad|title=NGC 231|access-date=31 December 2016}}

| size_v = 1.8{{prime}} × 1.8{{prime}}

| mass_msol = {{val|6.9e3}}{{cite journal|doi=10.1093/mnras/stab2297|title=STEP survey – II. Structural analysis of 170 star clusters in the SMC|year=2021|last1=Gatto|first1=M.|last2=Ripepi|first2=V.|last3=Bellazzini|first3=M.|last4=Tosi|first4=M.|last5=Cignoni|first5=M.|last6=Tortora|first6=C.|last7=Leccia|first7=S.|last8=Clementini|first8=G.|last9=Grebel|first9=E. K.|last10=Longo|first10=G.|last11=Marconi|first11=M.|last12=Musella|first12=I.|journal=Monthly Notices of the Royal Astronomical Society|volume=507|issue=3|pages=3312–3330|doi-access=free |arxiv=2108.02791}}

| age = 87 Myr

| notes =

| names = ESO 029-SC 005.

|image_size=250|image=NGC 220 NGC 222 NGC 231 DECam.png|caption=NGC 220 (lower right), NGC 222 (middle) and NGC 231 (upper left) with DECam}}

NGC 231 is an open cluster in the Small Magellanic Cloud. It is located in the constellation Tucana. It was discovered on August 1, 1826 by James Dunlop.{{cite web|title=New General Catalog Objects: NGC 200 - 249|url=http://cseligman.com/text/atlas/ngc2.htm#231|publisher=Cseligman|access-date=September 15, 2016}}