Laevens 3

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

{{Infobox globular cluster

| name = Laevens 3

| image =

| caption =

| credit =

| epoch = J2000

| constellation = Delphinus

| ra = {{RA|21|06|55.05}}

| dec = {{DEC|+14|59|03.84}}

| dist_ly = {{nowrap|{{val|200|+4|-3}} kly}}

| dist_pc = {{nowrap|{{val|61.4|+1.2|-1.0}} kpc}}

| appmag_v =

| size_v =

| absmag_v= −2.8

| mass_msol =

| mass_kg =

| radius_arcminsec = effective: 0.64 ± 0.05{{prime}}

| radius_ly = {{nowrap|37.2 ± 3.3 ly}}

| radius_pc = {{nowrap|11.4 ± 1.0 pc}}

| radius_tidal_arcminsec =

| radius_tidal_ly =

| radius_tidal_pc =

| v_hb =

| metal_fe = −1.8 ± 0.1

| metal_z =

| age =

| notes =

| names =

}}

Laevens 3 is a globular cluster in the constellation of Delphinus. It belongs to the Milky Way but orbits far from the centre. The cluster is named after Benjamin P. M. Laevens, the discoverer. It was first observed in 2015 using Pan-STARRS 1.{{cite journal |last1=Longeard |first1=Nicolas |last2=Martin |first2=Nicolas |last3=Ibata |first3=Rodrigo A |last4=Collins |first4=Michelle L M |last5=Laevens |first5=Benjamin P M |last6=Bell |first6=Eric |last7=Mackey |first7=Dougal |title=Detailed study of the Milky Way globular cluster Laevens 3 |journal=Monthly Notices of the Royal Astronomical Society |date=December 2019 |volume=490 |issue=2 |pages=1498–1508 |doi=10.1093/mnras/stz2592|doi-access=free |arxiv=1909.08622}}

It is located 210,000 light years from Earth in the outer galactic halo. Its orbit takes it as close as 133,000 ly from galactic centre out to 279,000 ly. The half light diameter is only 37 light years. The metallicity is −1.8 dex. It is about 13 billion years old, and its brightness is equivalent to 1,125 Suns.{{cite web |last1=Nowakowski |first1=Tomasz |title=Milky Way's satellite globular cluster studied in detail |url=https://phys.org/news/2019-09-milky-satellite-globular-cluster.html |website=phys.org |accessdate=16 October 2019 |language=en-us |date=26 September 2019}}