NGC 6656
E504212
NGC 6656 is a bright globular star cluster in the constellation Sagittarius, notable as one of the closest and most easily observed globular clusters from Earth.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | globular star cluster ⓘ |
| absoluteMagnitudeV | about −8.5 ⓘ |
| age | about 12 billion years ⓘ |
| alsoKnownAs |
GCl 99
NERFINISHED
ⓘ
M 22 NERFINISHED ⓘ M22 NERFINISHED ⓘ Messier 22 NERFINISHED ⓘ |
| angularSize | 32 arcminutes ⓘ |
| apparentMagnitudeV | 5.1 ⓘ |
| appearsNear | Galactic bulge NERFINISHED ⓘ |
| bestSeenFrom | Southern Hemisphere NERFINISHED ⓘ |
| bestViewingSeason |
northern summer
ⓘ
southern winter ⓘ |
| catalog |
Messier Catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| catalogNumber |
M22
NERFINISHED
ⓘ
NGC 6656 NERFINISHED ⓘ |
| constellation | Sagittarius NERFINISHED ⓘ |
| contains |
RR Lyrae variable stars
NERFINISHED
ⓘ
multiple stellar populations ⓘ planetary nebula GJJC 1 NERFINISHED ⓘ |
| coreCollapseStatus | non–core-collapsed ⓘ |
| declination | −23° 54′ 12″ ⓘ |
| discoveredBy | Abbé Nicolas-Louis de Lacaille NERFINISHED ⓘ |
| discoveryYear | 1747 ⓘ |
| distanceFromEarth_kpc | about 3.2 kiloparsecs ⓘ |
| distanceFromEarth_ly | about 10,600 light-years ⓘ |
| galacticLatitude | −7.55 degrees ⓘ |
| galacticLongitude | 9.89 degrees ⓘ |
| halfLightRadius | about 3.4 arcminutes ⓘ |
| hasCentralConcentration | moderate ⓘ |
| hasPhotometricVariability | true ⓘ |
| isEasilyObservedWith |
binoculars
ⓘ
small telescopes ⓘ |
| locatedIn |
Galactic halo
ⓘ
Milky Way ⓘ |
| mass | about 5×10^5 solar masses ⓘ |
| metallicity_[Fe/H] | about −1.7 ⓘ |
| notableFor |
being one of the brightest globular clusters in the sky
ⓘ
being one of the closest globular clusters to Earth ⓘ |
| observedBy | Hubble Space Telescope NERFINISHED ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| rightAscension | 18h 36m 24s ⓘ |
| spectralTypeDominant | G- and K-type giant stars ⓘ |
| surfaceBrightness | high ⓘ |
| visibleToNakedEye | true ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.