|
gptkbp:instance_of
|
gptkb:Nebula_Award
gptkb:astronomy
|
|
gptkbp:apparent_magnitude
|
8.0
8.4
|
|
gptkbp:contains
|
various elements including hydrogen and helium
|
|
gptkbp:declination
|
-11° 22' 24"
|
|
gptkbp:discovered_by
|
gptkb:William_Herschel
|
|
gptkbp:discovery_year
|
1782
1784
|
|
gptkbp:distance_from_earth
|
approximately 5,000 light-years
approximately 2,500 light years
|
|
gptkbp:emissions_standard
|
H-alpha and [ O III]
|
|
gptkbp:has_central_star
|
a hot white dwarf
|
|
gptkbp:has_color
|
greenish hue due to ionized gas
|
|
gptkbp:has_features
|
bipolar structure
|
|
gptkbp:has_radius
|
about 0.5 light years
|
|
gptkbp:has_spectral_type
|
gptkb:Type_II_planetary_nebula
O III
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
NGC 7009
|
|
gptkbp:is_located_at
|
Declination -11° 21' 00"
Right Ascension 21h 04m 10s
|
|
gptkbp:is_part_of
|
Messier 1 catalog
|
|
gptkbp:is_studied_in
|
astrophysics and astronomy
|
|
gptkbp:is_visible_from
|
Earth with small telescopes
|
|
gptkbp:known_as
|
gptkb:Saturn_Nebula
|
|
gptkbp:length
|
approximately 1.5 arcminutes
|
|
gptkbp:located_in
|
gptkb:Aquarius_constellation
gptkb:Aquarius
|
|
gptkbp:photography
|
gptkb:Hubble_Space_Telescope
|
|
gptkbp:right_ascension
|
21h 04m 12s
|
|
gptkbp:size
|
1.5 arcminutes
|
|
gptkbp:type
|
gptkb:Nebula_Award
gptkb:Planetary_Nebula
|
|
gptkbp:bfsParent
|
gptkb:Aquarius
|
|
gptkbp:bfsLayer
|
4
|