NGC 411

{{Short description|Globular cluster located in the constellation Tucana}}

{{Infobox open cluster

| name = NGC 411

| image = 300px

| caption = Hubble Space Telescope image of the open cluster NGC 411

| credit = NASA/ESA

| epoch = J2000

| constellation = Tucana

| ra = {{RA|01|07|55.95}}

| dec = {{DEC|-71|46|04.5}}

| dist_ly = {{convert|55000|+/-|4000|pc|ly|abbr=on|lk=on|order=flip}}{{cite web|title=NASA/IPAC Extragalactic Database|work=Results for NGC 0411|url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+411&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=2 September 2016}}

| appmag_v = 12.1{{cite simbad|title=NGC 411|access-date=6 February 2017}}

| size_v = 2.1{{prime}} × 1.9{{prime}}

| mass_msol = {{val|3.0e4}}

| age = 1.5 billion years{{cite journal|title=The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population|author1=Li, C.|author2=de Grijs, R.|author3=Bastian, N.|author4=Deng, L.|author5=Niederhofer, F.|author6=Zhang, C.|journal=Monthly Notices of the Royal Astronomical Society|volume=461|issue=3|pages=3212–3221|date=2016|bibcode=2016MNRAS.461.3212L|doi=10.1093/mnras/stw1491|doi-access=free |arxiv=1606.05394}}

| notes =

| names = Kron 60, Lindsay 82, ESO 51-19

}}

NGC 411 is a globular cluster located approximately {{convert|55000|pc|ly|abbr=on}} from Earth in the constellation Tucana. It was discovered in 1826 by James Dunlop. It was described by Dreyer as "extremely faint, pretty large, round, gradually very little brighter middle".{{cite web|title=New General Catalog Objects: NGC 400 - 449|url=http://cseligman.com/text/atlas/ngc4.htm#411|publisher=Cseligman|access-date=6 February 2017}} At a distance of about 180,000 light years (55,000 parsecs), it is located within the Small Magellanic Cloud. It has a mass of about {{solar mass|{{val|3.0e4}}|link=y}}, and a luminosity of about {{solar luminosity|{{val|8.0e4}}|link=y}}.{{cite journal|doi=10.1093/mnras/stab1065|title=Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds|year=2021|last1=Song|first1=Ying-Yi|last2=Mateo|first2=Mario|last3=Bailey|first3=John I.|last4=Walker|first4=Matthew G.|last5=Roederer|first5=Ian U.|last6=Olszewski|first6=Edward W.|last7=Reiter|first7=Megan|last8=Kremin|first8=Anthony|journal=Monthly Notices of the Royal Astronomical Society|volume=504|issue=3|pages=4160–4191|doi-access=free |arxiv=2104.06882}}

NGC 411 was imaged by the Hubble Space Telescope in 2013, showing an abundance of stars ranging from blue to red.{{cite news|url=https://www.nasa.gov/mission_pages/hubble/science/ngc411.html|title=Hubble Finds Appearances can be Deceptive|website=www.nasa.gov|date=2013}} In particular, this seemed to suggest that the cluster was much younger than previously thought: its age has been estimated at 1.5 billion years old, relatively young in astronomical terms. However, these results have been challenged by another group who state that these young stars may actually just be background stars, and are thus physically unrelated.{{cite journal|title=No evidence for younger stellar generations within the intermediate-age massive clusters NGC 1783, NGC 1806 and NGC 411|author1=Cabrera-Ziri, I.|display-authors=etal|journal=Monthly Notices of the Royal Astronomical Society|volume=459|issue=4|pages=4218–4223|date=2016|bibcode=2016MNRAS.459.4218C|doi=10.1093/mnras/stw966|doi-access=free |arxiv=1604.06106}}