Palomar 6

{{ Infobox globular cluster

| name = Palomar 6

| image = File:Palomar 6.jpg|thumb|

| caption =

| epoch = J2000

| class = XI

| constellation = Ophiuchus

| ra = {{RA|17|43|42.20}}{{cite web

| title=SIMBAD Astronomical Database

| work=Results for Palomar 6

| url=http://simbad.u-strasbg.fr/Simbad

| accessdate=2009-10-04}}

| dec = {{DEC|−26|13|21.0}}

| dist_ly = {{cvt|7.67|±|0.19|kpc|kly|order=flip|lk=on}}

| appmag_v =

| size_v =

| radius_ly =

| mass_msol = {{Val|2.28|e=5}}

| metal_fe = –0.91

| v_hb =

| age = 12.4 ± 0.9 Gyr{{cite journal|doi=10.1051/0004-6361/202141768|title=Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6|year=2021|last1=Souza|first1=S. O.|last2=Valentini|first2=M.|last3=Barbuy|first3=B.|last4=Pérez-Villegas|first4=A.|last5=Chiappini|first5=C.|last6=Ortolani|first6=S.|last7=Nardiello|first7=D.|last8=Dias|first8=B.|last9=Anders|first9=F.|last10=Bica|first10=E.|journal=Astronomy & Astrophysics|volume=656|pages=A78|arxiv=2109.04483|bibcode=2021A&A...656A..78S |s2cid=237485386}}

| notes =

| names = {{odlist|name=ESO 520-21|name2=GCl 75|name3= 1740-262}}

}}

Palomar 6 is a loose globular cluster in the constellation Ophiuchus that belongs to the Milky Way galaxy. It is a member of the Palomar Globular Clusters group and is located about 25,000 light-years (7,700 parsecs) away from the Sun. It formed in what would become the bulge of the Milky Way and is similar to other old-bulge globular clusters such as Messier 62, NGC 6522, NGC 6558, and Haute-Provence 1.

First discovered on the National Geographic Society – Palomar Observatory Sky Survey plates by Robert G. Harrington and Fritz Zwicky,{{cite journal

| last=Abell

| first = George O.

| authorlink = George Ogden Abell

| title=Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey

| journal=Publications of the Astronomical Society of the Pacific

| year=1955

| volume=67

| issue=397

| pages=258

| bibcode=1955PASP...67..258A

| doi=10.1086/126815

| doi-access=free

}}

it was catalogued as a globular cluster, and was thought to be one of four globulars known to contain a planetary nebula. A paper published in 2024, however, showed that the proper motion of the central star of the nebula JaFu 1 differs from that of the cluster with high statistical significance, thus confirming that the nebula is not located within the cluster.{{Cite journal |last1=Bond |first1=Howard E. |last2=Bellini |first2=Andrea |last3=Sahu |first3=Kailash C. |date=2024-09-17 |title=Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. I. HST Observations of JaFu 1 Near the Globular Cluster Palomar 6 |journal=The Astronomical Journal |language=en |volume=168 |issue=4 |pages=160 |doi=10.3847/1538-3881/ad67d4 |doi-access=free |arxiv=2407.18135 |bibcode=2024AJ....168..160B |issn=1538-3881}}