M22
E472712
M22 is a bright globular star cluster in the constellation Sagittarius, notable for being one of the closest and most easily observed globular clusters from Earth.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| M28 | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
deep-sky object ⓘ globular star cluster ⓘ |
| age | about 12 billion years ⓘ |
| alsoKnownAs |
GCl 97
ⓘ
Messier 22 NERFINISHED ⓘ NGC 6656 NERFINISHED ⓘ |
| angularSize | 32 arcminutes ⓘ |
| apparentMagnitudeV | 5.1 ⓘ |
| bestSeenFromHemisphere | Southern Hemisphere NERFINISHED ⓘ |
| bestSeenInMonth | August ⓘ |
| cataloguedBy | Charles Messier NERFINISHED ⓘ |
| contains |
blue straggler stars
ⓘ
millisecond pulsars ⓘ multiple stellar populations ⓘ planetary nebulae ⓘ variable stars ⓘ |
| coreRadius | about 1.3 arcminutes ⓘ |
| declination | −23° 54′ 12″ ⓘ |
| discoveredBy | Abraham Ihle NERFINISHED ⓘ |
| discoveryYear | 1665 ⓘ |
| distanceFromEarth |
about 10,600 light-years
ⓘ
about 3.2 kiloparsecs ⓘ |
| galacticLatitude | −7.55° ⓘ |
| galacticLongitude | 9.89° ⓘ |
| halfLightRadius | about 3.4 arcminutes ⓘ |
| hasCoreCollapseStatus | non–core-collapsed ⓘ |
| hasNotableFeature |
easily observed with small telescopes or binoculars
ⓘ
one of the brightest globular clusters in the sky ⓘ one of the nearest globular clusters to Earth ⓘ |
| hostGalaxy | Milky Way NERFINISHED ⓘ |
| locatedIn |
Galactic bulge region
NERFINISHED
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Sagittarius NERFINISHED ⓘ |
| locatedInRegionOfSky | Teapot asterism area of Sagittarius ⓘ |
| locatedNear | Galactic center NERFINISHED ⓘ |
| mass | about 5×10^5 solar masses ⓘ |
| messierNumber | 22 ⓘ |
| metallicity | [Fe/H] ≈ −1.7 ⓘ |
| ngcNumber | 6656 ⓘ |
| observedInWavelength |
X-ray
ⓘ
optical ⓘ radio ⓘ |
| rightAscension | 18h 36m 24s ⓘ |
| surfaceBrightness | high for a globular cluster ⓘ |
| tidalRadius | about 32 arcminutes ⓘ |
| visibilityFromEarth | naked-eye object under dark skies ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
M28