Orphan stream
E502433
The Orphan stream is a narrow, elongated stream of stars in the Milky Way’s halo, believed to be the remnants of a disrupted dwarf galaxy or globular cluster.
Statements (32)
| Predicate | Object |
|---|---|
| instanceOf |
Milky Way halo substructure
ⓘ
astronomical structure ⓘ stellar stream ⓘ |
| associatedWith | possible progenitor dwarf galaxy in Ursa Major region ⓘ |
| composedOf | stars ⓘ |
| discoveredBy |
N. W. Evans
NERFINISHED
ⓘ
Sloan Digital Sky Survey NERFINISHED ⓘ Vasily Belokurov NERFINISHED ⓘ |
| discoveredIn | 2006 ⓘ |
| extendsAcross | northern Galactic hemisphere ⓘ |
| hasAlternativeName | Orphan stellar stream NERFINISHED ⓘ |
| hasApproximateDistanceFromSun | 20–50 kiloparsecs ⓘ |
| hasApproximateLength | ~60 degrees on the sky ⓘ |
| hasKinematics | prograde orbit around Milky Way ⓘ |
| hasMetallicity |
[Fe/H] ≈ −1.5 to −2.0
ⓘ
metal-poor ⓘ |
| hasNotableProperty |
coherent proper motions in Gaia data
ⓘ
large spatial extent ⓘ low surface brightness ⓘ |
| hasProgenitorStatus | progenitor not definitively identified ⓘ |
| hasShape |
elongated
ⓘ
narrow ⓘ |
| locatedIn |
Milky Way galaxy
NERFINISHED
ⓘ
Milky Way halo NERFINISHED ⓘ |
| observedBy |
Gaia space observatory
NERFINISHED
ⓘ
Pan-STARRS NERFINISHED ⓘ Sloan Digital Sky Survey NERFINISHED ⓘ |
| partOf | Galactic stellar halo ⓘ |
| possibleOrigin |
disrupted dwarf galaxy
ⓘ
disrupted globular cluster ⓘ |
| usedFor |
studying tidal disruption of satellites
ⓘ
tracing Milky Way dark matter halo potential ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.