Statements (78)
| Predicate | Object |
|---|---|
| gptkbp:instance_of |
gptkb:exoplanet
|
| gptkbp:age |
approximately 5 billion years
|
| gptkbp:apparent_magnitude |
gptkb:12.5
not applicable |
| gptkbp:atmosphere |
hydrogen and helium
hydrogen-rich hydrogen-rich atmosphere hydrogen, helium, traces of heavier elements hydrogen-helium |
| gptkbp:average_temperature |
1500 K
approximately 1500 K 1500 K to 2000 K |
| gptkbp:contains_star |
gptkb:Milky_Way
G-type G-type star |
| gptkbp:country |
gptkb:hot_Jupiter
gptkb:Giant HAT-P-21 system |
| gptkbp:discovered_by |
HATNet
HATNet Project |
| gptkbp:discovery |
gptkb:Hawaii
transit method transit photometry HATNet Observatory HATNet collaboration |
| gptkbp:discovery_method_type |
transit
|
| gptkbp:discovery_year |
gptkb:2010
|
| gptkbp:distance_from_earth |
approximately 124 light years
|
| gptkbp:eccentricity |
0.0
|
| gptkbp:first_appearance |
gptkb:2010
|
| gptkbp:has_luminosity |
approximately 5800 K
|
| gptkbp:has_radius |
1.1 Jupiter radii
1.2 times the radius of Jupiter 1.1 to 1.2 Jupiter radii |
| gptkbp:has_spectral_type |
G-type star
|
| gptkbp:hosts |
HAT-P-21
|
| https://www.w3.org/2000/01/rdf-schema#label |
HAT-P-21 b
|
| gptkbp:light_curve_data |
available
|
| gptkbp:lighting |
gptkb:2010
observed |
| gptkbp:located_in |
constellation Pegasus
|
| gptkbp:mass |
1.1 solar masses
1.1 times the mass of the Sun 1.1 times the radius of the Sun 1.2 Jupiter radii 1.5 Jupiter masses 1.5 times the mass of Jupiter 1.1 solar radii 0.5 Jupiter masses 0.5 to 0.6 Jupiter masses |
| gptkbp:mass_in_jupiter_masses |
1.5
|
| gptkbp:notable_galaxies |
HATNet telescope
|
| gptkbp:orbital_altitude |
circular
0.055 AU ~100 km/s |
| gptkbp:orbital_inclination |
88.5 degrees
87.5 degrees |
| gptkbp:orbital_period |
not in resonance
short-period 4.465 4.465 days 4.465 days, 0.055 AU, 88.5 degrees 4.4 to 4.5 days |
| gptkbp:radius_in_jupiter_radii |
1.2
|
| gptkbp:research |
available
|
| gptkbp:rotation_period |
not applicable
|
| gptkbp:route |
3.5 hours
|
| gptkbp:season |
not applicable
|
| gptkbp:semi_major_axis |
0.055
0.055 AU |
| gptkbp:spectroscopy_data |
available
|
| gptkbp:surface |
~10 m/s²
|
| gptkbp:system |
HAT-P-21 system
|
| gptkbp:system_name |
HAT-P-21 system
|
| gptkbp:transmission |
0.02
~1.5% |
| gptkbp:type |
gptkb:hot_Jupiter
|
| gptkbp:year |
4.465 days
|