| M59-UCD3 | |
|---|---|
 Images of two ultracompact dwarf galaxies. M59-UCD3 is in the inset to the left, while M85-HCC1 is in the inset to the right. | |
| Observation data (J2000epoch) | |
| Constellation | Coma Berenices |
| Right ascension | 12h 25m 22.842s[1] |
| Declination | +18° 10′ 53.67″[1] |
| Heliocentric radial velocity | 658 ± 4[2] |
| Apparent magnitude (V) | 18.80 ± 0.03[2] |
| Absolute magnitude (V) | −12.55 ± 0.07[2] |
| Characteristics | |
| Mass | (1.2±0.1)×107[2] M☉ |
| Half-light radius (physical) | 1.85 ± 0.9pc[2] |
| Other designations | |
| 2MASS J12252287+1810539, SDSS J122522.84+181053.6[1] | |
M85-HCC1 is an ultracompactdwarf galaxy with a star density 1,000,000 times that of the solar neighbourhood,[3][2] lying near the galaxyMessier 85. As of 2015[update], it is the densest galaxy known.[4]
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