Palomar 1

{{Short description|Globular cluster in the constellation Cepheus}}

{{ Infobox globular cluster

| name = Palomar 1

| image = 280px

| caption = Palomar 1 by Hubble Space Telescope; 3.3{{prime}} view

| credit =

| epoch = J2000

| class = XII

| constellation = Cepheus

| ra = {{RA|03|33|20.04}}

| dec = {{DEC|+79|34|51.8}}

| dist_ly = {{Convert|36.5|+/-|4.2|kly|pc|abbr=on|lk=on}}

| appmag_v = +13.18

| size_v = 2.8{{prime}}

| radius_ly = 15 lydistance × sin( diameter_angle / 2 ) = 15 ly. radius

| mass_kg =

| mass_msol =

| v_hb =

| age = 6.3 to 8 Gyr

| notes = –

| names = LEDA 13165

}}

Palomar 1 is a globular cluster, part of the Palomar group in the constellation Cepheus in the

halo possibly in the Outer Arm of the Milky Way galaxy. First discovered by George O. Abell in 1954 on the Palomar Survey Sky plates,{{cite journal

| last=Abell

| first = George O.

| 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

| date=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.

At 6.3 to 8 Gyr, it is a very young cluster when compared to the other globular clusters in the Milky Way.

It is a relatively metal-poor globular with [Fe/H] = −0.60.{{cite journal

| author = van den Bergh, Sidney

| author2 = Mackey, A. D.

| title=Globular clusters and the formation of the outer Galactic halo

| journal=Monthly Notices of the Royal Astronomical Society

| date=2004

| volume=354

| issue=3

| pages=713–719

| bibcode=2004MNRAS.354..713V

| doi=10.1111/j.1365-2966.2004.08228.x

| doi-access = free

|arxiv = astro-ph/0407346 | s2cid = 15407602

}}

It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf companion globular Terzan 7, that is, it may have once been associated

with a dwarf spheroidal galaxy that was later destroyed by tidal forces.