Statements (80)
| Predicate | Object |
|---|---|
| gptkbp:instance_of |
gptkb:exoplanet
|
| gptkbp:atmosphere |
hydrogen and helium
hydrogen, helium, and heavier elements hydrogen-rich atmosphere water vapor detected |
| gptkbp:average_temperature |
approximately 1200 K
|
| gptkbp:contains_star |
F-type star
|
| gptkbp:country |
gptkb:unknown
gptkb:hot_Jupiter gptkb:Giant formed in a protoplanetary disk HD 209458 system |
| gptkbp:discovered_by |
David Charbonneau
|
| gptkbp:discovery |
gptkb:Hawaii
transit method Geoffrey W. Marcy and others first exoplanet observed to transit its star |
| gptkbp:discovery_year |
gptkb:1999
|
| gptkbp:distance_from_earth |
approximately 159 light years
|
| gptkbp:eccentricity |
0.0
|
| gptkbp:first_exoplanet |
to have its atmosphere studied
|
| gptkbp:first_exoplanet_to_be_observed |
transiting its star
|
| gptkbp:fledging_period |
observed
possible due to high temperature |
| gptkbp:future_prospects |
ongoing studies on atmospheric composition
|
| gptkbp:growth_habit |
not habitable due to extreme conditions
|
| gptkbp:has_radius |
1.35 times the radius of Jupiter
1.2 to 1.5 times Jupiter's radius approximately 1.35 times the radius of Jupiter |
| gptkbp:has_spectral_type |
F8 V
|
| gptkbp:hosts |
gptkb:HD_209458
|
| https://www.w3.org/2000/01/rdf-schema#label |
HD 209458 c
|
| gptkbp:investment |
gptkb:unknown
|
| gptkbp:is_considered |
a prime target for atmospheric studies
|
| gptkbp:is_known_for |
its high temperature
being one of the first exoplanets discovered its close orbit to its star its transiting nature its relatively low mass compared to other hot Jupiters |
| gptkbp:is_located_in |
the constellation Pegasus
|
| gptkbp:is_notable_for |
its discovery via the transit method.
|
| gptkbp:is_observed_in |
various ground-based telescopes
|
| gptkbp:is_part_of |
gptkb:the_Milky_Way_galaxy
the exoplanet catalog the HD 209458 system the class of exoplanets known as 'hot Jupiters' |
| gptkbp:is_studied_in |
gptkb:Spitzer_Space_Telescope
gptkb:Kepler_Space_Telescope gptkb:Hubble_Space_Telescope |
| gptkbp:lighting |
observed during transits
used to determine size and density |
| gptkbp:mass |
1.1 times the mass of the Sun
1.2 times the radius of the Sun 0.5 to 1.5 times Jupiter's mass 0.69 times the mass of Jupiter approximately 0.69 times the mass of Jupiter |
| gptkbp:module |
0.02
|
| gptkbp:orbit_type |
gptkb:HD_209458
|
| gptkbp:orbital_altitude |
stable orbit
0.047 AU from its star approximately 140,000 m/s |
| gptkbp:orbital_inclination |
87.9 degrees
about 85 degrees |
| gptkbp:orbital_period |
gptkb:none
3.524 days |
| gptkbp:research |
photometry
monitored by various telescopes |
| gptkbp:research_focus |
atmospheric studies
|
| gptkbp:research_importance |
important for studying exoplanet atmospheres
|
| gptkbp:rotation_period |
gptkb:unknown
|
| gptkbp:route |
approximately 3.5 hours
|
| gptkbp:seasonal_activities |
high
significant due to proximity to host star |
| gptkbp:semi_major_axis |
0.047 AU
|
| gptkbp:sensor |
gptkb:1999
|
| gptkbp:surface |
approximately 24.5 m/s²
approximately 18.6 m/s² |
| gptkbp:transit_observations |
conducted by Hubble Space Telescope
|
| gptkbp:type |
gptkb:hot_Jupiter
|
| gptkbp:yearly_orbit |
1.0 year
|