NGC 657

{{Short description|Open cluster in the constellation of Cassiopeia}}

{{Infobox open cluster

| name = NGC 657

| image = 250px

| caption = NGC 657

| credit = Sloan Digital Sky Survey

| epoch = J2000

| constellation = Cassiopeia

| ra = {{Deg2HMS|025.849|sup=yes}}

| dec = {{Deg2DMS|+55.840|sup=yes}}

| dist_ly = 6308 ly

| dist_pc = 1934 pc{{cite journal|doi=10.1051/0004-6361/201322302|bibcode=2013A&A...558A..53K|title=Global survey of star clusters in the Milky Way|year=2013|last1=Kharchenko|first1=N. V.|last2=Piskunov|first2=A. E.|last3=Schilbach|first3=E.|last4=Röser|first4=S.|last5=Scholz|first5=R.-D.|journal=Astronomy & Astrophysics|volume=558|pages=A53|doi-access=free|arxiv=1308.5822}}

| appmag_v =

| size_v =

| mass_msol =

| age = ~1 Gyr

| notes =

| names = C 0140+556, MWSC 135{{cite simbad|title=NGC 657|access-date=2020-05-23}}

}}

NGC 657 is an open cluster containing very few stars or a group of stars located in the constellation Cassiopeia. It was discovered by British astronomer John Herschel in 1831.{{Cite web|url=https://in-the-sky.org/data/object.php?id=NGC657|title=The open cluster NGC 657 - In-The-Sky.org|last=Ford|first=Dominic|website=in-the-sky.org|language=en|access-date=2020-04-05}}{{Cite web|url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+657&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=Your NED Search Results|website=ned.ipac.caltech.edu|access-date=2020-04-05}}