Messier 12
E486469
Messier 12 is a globular star cluster located in the constellation Ophiuchus, notable for its relatively loose structure and rich population of ancient stars.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ globular star cluster ⓘ |
| absoluteMagnitudeV | about −7.3 ⓘ |
| age | about 12.6 billion years ⓘ |
| alsoKnownAs |
M12
NERFINISHED
ⓘ
NGC 6218 NERFINISHED ⓘ |
| angularSize | 14.5 arcminutes ⓘ |
| apparentMagnitudeB | 7.68 ⓘ |
| apparentMagnitudeRangeOfStars | down to about magnitude 13 ⓘ |
| apparentMagnitudeV | 6.7 ⓘ |
| belongsTo | Milky Way globular cluster system NERFINISHED ⓘ |
| bestSeenFrom | Northern Hemisphere NERFINISHED ⓘ |
| bestViewingSeason | late spring ⓘ |
| canBeObservedWith | small telescope ⓘ |
| catalog |
Messier catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| contains |
ancient stars
ⓘ
blue straggler stars ⓘ horizontal branch stars ⓘ red giant branch stars ⓘ |
| coreRadius | about 1.77 arcminutes ⓘ |
| declination | −01° 56′ 54″ ⓘ |
| discoveredAs | nebula without stars ⓘ |
| discoveredBy | Charles Messier NERFINISHED ⓘ |
| discoveryDate | 1764 ⓘ |
| distanceFromEarth |
about 16,000 light-years
ⓘ
about 4.9 kiloparsecs ⓘ |
| epoch | J2000 ⓘ |
| galacticLatitude | 26.31 degrees ⓘ |
| galacticLongitude | 15.72 degrees ⓘ |
| halfLightRadius | about 3.0 arcminutes ⓘ |
| hasColorIndexBminusV | about 0.73 ⓘ |
| hasLooseStructure | true ⓘ |
| heliocentricRadialVelocity | about +16 km/s ⓘ |
| isNearOnSky | Messier 10 NERFINISHED ⓘ |
| locatedIn |
Galactic halo
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Ophiuchus NERFINISHED ⓘ |
| metallicityFeH | about −1.3 ⓘ |
| notableFor |
relatively loose structure
ⓘ
rich population of ancient stars ⓘ |
| observedBy | Hubble Space Telescope NERFINISHED ⓘ |
| partOf | Ophiuchus constellation region NERFINISHED ⓘ |
| rightAscension | 16h 47m 14s ⓘ |
| ShapleySawyerConcentrationClass | IX ⓘ |
| tidalRadius | about 17.6 arcminutes ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.