UGC 8508

{{Short description|Irregular galaxy in the constellation Ursa Major}}

{{Infobox galaxy

| name = UGC 8508

| image =File:Color_cutout_hst_11719_19_wfc3_ir_f160w_f110w_sci_UGC_8508.jpg

| caption = UGC 8508 (Hubble Space Telescope)

| epoch = J2000

| constellation name = Ursa Major

| ra = {{RA|13|30|44.4}}

| dec = {{DEC|+54|54|36}}

| z = +198 km/s

| dist_ly = {{cvt|2.606|+/-|0.023|Mpc|Mly|order=flip|lk=on}}{{cite web |url=http://ned.ipac.caltech.edu/byname?objname=ugc+8508&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1 |title=NED results for UGC 8508| publisher=NASA/IPAC Extragalactic Database via Univ. of California |access-date=2024-02-15}}

| type = IAm

| size = 1.29 kpc

| appmag_v = 12.88

| size_v = 1.7′ × 1.0'

| notes =

| names = I Zw 060, PGC 47495

}}

UGC 8508 is a dwarf irregular galaxy located about 8.5 million light-years away from Earth in the constellation of Ursa Major. It is sometimes classified as a member of the M101 Group of galaxies and has a diameter of around {{cvt|1.29|kpc|kly|order=flip|lk=on}}.

As an irregular galaxy, UGC 8508 does not exhibit any large scale organization in its structure. It has a bluish appearance when viewed in the visible spectrum and although it has a large number of H I regions, it has a relatively low-luminosity overall. However, the presence of a significant number of both blue and red supergiant stars indicate it is likely to have undergone a period of rapid star formation in the cosmologically recent past. The distribution of the supergiants suggests that star formation has largely ceased at distances greater than {{cvt|0.4|kpc|kly|order=flip|lk=on}} from the center of the galaxy.{{cite journal| author=J. R. Mould| author2=D. P. Schneider| author3=P. Harding| author4=G. D. Bothun | name-list-style=amp| title=UGC 8508 - A Dwarf Galaxy Associated with the M101 Group| journal=Publications of the Astronomical Society of the Pacific| date=1986| volume=98| issue=606| pages=732–739|arxiv = |bibcode = |doi = 10.1086/131819 | s2cid=}}