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gptkbp:instanceOf
|
gptkb:planetary_nebula
|
|
gptkbp:alsoKnownAs
|
gptkb:Ring_Nebula
gptkb:M57
|
|
gptkbp:angularSize
|
1.3 arcminutes × 1.0 arcminutes
|
|
gptkbp:apparentMagnitude
|
8.8
|
|
gptkbp:catalogue
|
gptkb:NGC_6720
gptkb:Messier_Catalogue
|
|
gptkbp:centralStarType
|
white dwarf
|
|
gptkbp:constellationQuadrant
|
gptkb:NQ4
|
|
gptkbp:contains
|
ionized gas
|
|
gptkbp:declination
|
+33° 01′ 45.03″
|
|
gptkbp:diameter
|
about 1 light-year
|
|
gptkbp:discoveredBy
|
gptkb:Antoine_Darquier_de_Pellepoix
gptkb:Charles_Messier
|
|
gptkbp:discoveredIn
|
1779
|
|
gptkbp:distanceFromEarth
|
about 2,300 light-years
|
|
gptkbp:epoch
|
gptkb:J2000
|
|
gptkbp:expansion
|
about 20–30 km/s
|
|
gptkbp:hasViewOf
|
amateur telescopes
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Messier 57
|
|
gptkbp:locatedIn
|
constellation Lyra
|
|
gptkbp:notableFor
|
distinct ring structure
|
|
gptkbp:observedBy
|
gptkb:Hubble_Space_Telescope
|
|
gptkbp:partOf
|
gptkb:Milky_Way_Galaxy
|
|
gptkbp:rightAscension
|
18h 53m 35.079s
|
|
gptkbp:shape
|
elliptical ring
|
|
gptkbp:spectralTypeCentralStar
|
O-type
|
|
gptkbp:bfsParent
|
gptkb:Charles_Messier
gptkb:Lyra
gptkb:Ring_Nebula
gptkb:M57
|
|
gptkbp:bfsLayer
|
6
|