Koposov 2

{{short description|Globular cluster in the constellation Gemini}}

{{Infobox globular cluster

| name = Koposov 2

| image = GLC_Koposov2.png

| caption =

| credit =

| epoch = J2000

| class =

| constellation = Gemini

| ra = {{RA|07|58|17.0}}{{cite web|title=Koposov 2|url=http://spider.seds.org/spider/MWGC/koposov2.html|publisher=Spider|access-date=15 February 2013}}

| dec = {{DEC|+26|15|18.0}}

| dist_ly = {{Convert|113.1|kly|kpc|abbr=on|lk=on}}

| appmag_v = 17.60

| size_v =

| mass_kg =

| mass_msol =

| radius_ly = approx. {{Convert|3|pc|ly|abbr=on|lk=on}}

| v_hb =

| age =

| notes =

| names =

}}

Koposov 2 is a low-luminosity globular cluster in the constellation Gemini in the halo of the Milky Way galaxy. It was discovered, along with globular cluster Koposov 1 by S. Koposov et al. in 2007. Koposov 1 and Koposov 2 were described by their discoverers as the "lowest luminosity globular clusters orbiting the Milky Way," along with AM 4, Palomar 1, and Whiting 1.{{cite journal

| last1 = Koposov | first1 = S.

| last2 = de Jong | first2 = J.T.A.

| last3 = Belokurov | first3 = V.

| last4 = Rix | first4 = H.-W.

| last5 = Zucker | first5 = D.B.

| last6 = Evans | first6 = N.W.

| last7 = Gilmore | first7 = G.

| last8 = Irwin | first8 = M.J.

| last9 = Bell | first9 = E.F.

| year = 2007

| title = The Discovery of Two Extremely Low Luminosity Milky Way Globular Clusters

| journal = The Astrophysical Journal

| volume= 669 | issue = 1

| pages = 337–342 | doi=10.1086/521422 | bibcode=2007ApJ...669..337K |arxiv = 0706.0019 | s2cid = 6680417

}}