M59-UCD3 is an

ultra-compact dwarf galaxy A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars. The Large Magellanic Cloud, which closely orbits the Milky Way and contains over 30 billion stars, is so ...

located near the

Messier 59 Messier 59 or M59, also known as NGC 4621, is an elliptical galaxy in the celestial equator, equatorial constellation of Virgo (constellation), Virgo. It is a member of the Virgo Cluster, with the nearest fellow member away and around 5 magnitud ...

galaxy A galaxy is a Physical system, system of stars, stellar remnants, interstellar medium, interstellar gas, cosmic dust, dust, and dark matter bound together by gravity. The word is derived from the Ancient Greek, Greek ' (), literally 'milky', ...

. , it is the second-densest galaxy currently observed, second to M85-HCC1.

References

See also