Segue 2 Dwarf Galaxy
E460839
Milky Way satellite galaxy
dark-matter-dominated galaxy
dwarf galaxy
satellite galaxy
ultra-faint dwarf galaxy
Segue 2 Dwarf Galaxy is an ultra-faint dwarf satellite galaxy of the Milky Way, notable for its extremely low luminosity and dark-matter dominance.
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Milky Way satellite galaxy
ⓘ
dark-matter-dominated galaxy ⓘ dwarf galaxy ⓘ satellite galaxy ⓘ ultra-faint dwarf galaxy ⓘ |
| absoluteMagnitudeV | about −2.5 ⓘ |
| apparentMagnitude | too faint to be seen with small telescopes ⓘ |
| contains | very few stars ⓘ |
| darkMatterDominated | true ⓘ |
| discoveredBy |
Sloan Digital Sky Survey team
NERFINISHED
ⓘ
V. Belokurov NERFINISHED ⓘ |
| discoveryMethod | Sloan Digital Sky Survey imaging NERFINISHED ⓘ |
| discoveryYear | 2009 ⓘ |
| distanceFromEarth |
about 114,000 light-years
ⓘ
about 35 kiloparsecs ⓘ |
| dominantStellarPopulationAge | older than 10 billion years ⓘ |
| galaxyType | dSph ⓘ |
| gasContent | gas-poor ⓘ |
| halfLightRadius |
about 110 light-years
ⓘ
about 34 parsecs ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| locatedIn |
Local Group
NERFINISHED
ⓘ
constellation Aries ⓘ |
| massToLightRatio | of order 10^2 to 10^3 in solar units ⓘ |
| meanMetallicity | [Fe/H] about −2.2 ⓘ |
| memberOf | Milky Way halo NERFINISHED ⓘ |
| metallicity | very metal-poor ⓘ |
| notableFor |
being one of the faintest known galaxies
ⓘ
extremely low luminosity ⓘ strong dark-matter dominance ⓘ |
| observedWith |
Sloan Digital Sky Survey
NERFINISHED
ⓘ
large ground-based telescopes ⓘ |
| orbitalStatus | bound satellite of the Milky Way ⓘ |
| redshift | near zero ⓘ |
| similarTo |
Bootes II Dwarf Galaxy
NERFINISHED
ⓘ
Segue 1 Dwarf Galaxy NERFINISHED ⓘ other ultra-faint Milky Way satellites ⓘ |
| starFormationActivity | no current star formation ⓘ |
| stellarMass | of order 10^3 solar masses ⓘ |
| stellarPopulation | old ⓘ |
| surfaceBrightness | extremely low ⓘ |
| totalLuminosity | about 900 times the luminosity of the Sun ⓘ |
| usedFor |
studying galaxy formation at the lowest masses
ⓘ
testing dark matter models ⓘ |
| velocityDispersion | a few kilometers per second ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.