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gptkbp:instance_of
|
gptkb:Nebula_Award
|
|
gptkbp:age
|
around 10,000 years
|
|
gptkbp:apparent_magnitude
|
11.5
|
|
gptkbp:associated_stars
|
multiple stars in vicinity
|
|
gptkbp:base_notes
|
visible in small telescopes
|
|
gptkbp:composed_of
|
hydrogen and helium
|
|
gptkbp:coordinates
|
19h 42m 36s -14° 24' 30"
|
|
gptkbp:declination
|
-14° 24' 30"
|
|
gptkbp:discovered_by
|
gptkb:William_Herschel
|
|
gptkbp:discovery_year
|
1787
|
|
gptkbp:distance_from_earth
|
approximately 3,000 light years
|
|
gptkbp:exhibition
|
gptkb:New_General_Catalogue
|
|
gptkbp:expansion_plans
|
approximately 20 km/s
|
|
gptkbp:features
|
ring structure
central star
|
|
gptkbp:has_spectral_type
|
O-type star
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
NGC 6818
|
|
gptkbp:image
|
Hubble Space Telescope image
|
|
gptkbp:is_observed_in
|
amateur astronomers
|
|
gptkbp:is_part_of
|
gptkb:Lyra
|
|
gptkbp:is_visible_from
|
best viewed in summer months
|
|
gptkbp:lighting
|
faint
|
|
gptkbp:located_in
|
constellation Sagittarius
|
|
gptkbp:photometric_type
|
gptkb:Nebula_Award
|
|
gptkbp:previous_name
|
PK 36-12.1
|
|
gptkbp:right_ascension
|
19h 42m 36s
|
|
gptkbp:size
|
0.5 arcminutes
|
|
gptkbp:type
|
gptkb:Nebula_Award
|
|
gptkbp:bfsParent
|
gptkb:Lyra
|
|
gptkbp:bfsLayer
|
5
|