Triangulum II

Triangulum II (Tri II or Laevens 2) is a dwarf galaxy close to the Milky Way Galaxy. Like other dwarf spheroidal galaxies, its stellar population is very old: the galaxy was quenched before 11.5 billion years ago.^[2] It contains only 1000 stars, yet is quite massive, having a solar mass to light ratio of 3600.^[3] This is an unusually high mass for such a small galaxy.^[4]

Triangulum II
Observation data (J2000 epoch)
Constellation	Triangulum
Right ascension	02h 13m 17.4s[1]
Declination	+36° 10′ 42.4″[1]
Distance	97.8 ± 6.5 kly (30 ± 2 kpc)[1]
Characteristics
Mass/Light ratio	3600 (V)[1] M☉/L☉
Apparent size (V)	3.9′[1]
Other designations
Triangulum II, Tri II, Laevens 2, Lae 2

The distance from the centre of the Milky Way is 26 kpc (85 kly). The luminosity is 450 times that of the Sun.^[3] This makes it one of the dimmest known galaxies.^[3] The 2D half light radius is 34 pc (110 ly). The galaxy was discovered in images taken by Pan-STARRS by Benjamin P. M. Laevens in 2015.^[1][3]

Triangulum II is a candidate for detecting WIMPs as a source of dark matter.^[4]