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gptkbp:instance_of
|
gptkb:star
|
|
gptkbp:atmosphere
|
Kepler-21b: thick atmosphere
Kepler-21c: thick atmosphere
|
|
gptkbp:contains
|
gptkb:Kepler-21
|
|
gptkbp:contains_star
|
gptkb:main-sequence_star
|
|
gptkbp:country
|
2
formed in protoplanetary disk
multi-planet system
Kepler-21b: gas giant
Kepler-21c: gas giant
|
|
gptkbp:discovered_by
|
gptkb:Kepler_Space_Telescope
|
|
gptkbp:discovery
|
transit method
|
|
gptkbp:discovery_year
|
gptkb:2011
|
|
gptkbp:distance_from_earth
|
approximately 300 light years
|
|
gptkbp:eccentricity
|
Kepler-21b: low
Kepler-21c: low
|
|
gptkbp:growth_habit
|
none known
|
|
gptkbp:has_luminosity
|
approximately 4.5 billion years
low variability
1.2 solar luminosities
low activity
|
|
gptkbp:homeworld
|
gptkb:Kepler-21b
gptkb:Kepler-21c
|
|
gptkbp:host_star_mass
|
1.1 solar masses
|
|
gptkbp:host_star_radius
|
1.1 solar radii
|
|
gptkbp:host_star_temperature
|
approximately 5800 K
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Kepler-21 system
|
|
gptkbp:location
|
gptkb:Cygnus_constellation
|
|
gptkbp:mass
|
Kepler-21b: 0.5 Jupiter masses
Kepler-21b: 1.2 Jupiter radii
Kepler-21c: 0.4 Jupiter masses
Kepler-21c: 1.1 Jupiter radii
|
|
gptkbp:metallicity
|
solar metallicity
|
|
gptkbp:next_event
|
gptkb:James_Webb_Space_Telescope
|
|
gptkbp:notable_feature
|
two confirmed exoplanets
|
|
gptkbp:orbital_inclination
|
approximately 90 degrees
|
|
gptkbp:orbital_period
|
Kepler-21b: 10.8 days
Kepler-21c: 21.2 days
|
|
gptkbp:planetary_discovery_method
|
transit method
|
|
gptkbp:planetary_migration
|
possible inward migration
|
|
gptkbp:planetary_temperature
|
Kepler-21b: high
Kepler-21c: high
|
|
gptkbp:research
|
distance from Earth
Kepler light curves
faintness of host star
|
|
gptkbp:research_focus
|
exoplanetary atmospheres
|
|
gptkbp:significance
|
study of exoplanets
|
|
gptkbp:stellar_rotation_period
|
approximately 25 days
|
|
gptkbp:system
|
gptkb:Kepler-16_system
gptkb:Kepler-20_system
gptkb:Kepler-22_system
gptkb:Kepler-186_system
Kepler-11 system
|
|
gptkbp:bfsParent
|
gptkb:Kepler-21b
|
|
gptkbp:bfsLayer
|
5
|