HAT-P-7 b
Sign in to saveHAT-P-7b (or Kepler-2b) is an extrasolar planet discovered in 2008. It orbits very close to its host star and is larger than Jupiter. Due to the extreme heat that it receives from its star, the dayside temperature is predicted to be , while nightside temperatures are . HAT-P-7b is also one of the darkest planets ever observed, with an albedo of less than 0.03—meaning it absorbs more than 97% of the visible light that strikes it.
Astronomical data · SIMBAD
- Object type
- Pl
- Distance
- 1,088 light-years
- Coordinates
- RA 292.2473° · Dec 47.9695°
via SIMBAD · CDS Strasbourg
Key facts
- Planet.apsis
- astron
- Planet.semimajor
- AU
- Planet.period
- d
- Planet.name
- HAT-P-7b
- Planet.image
- Exoplanet Comparison HAT-P-7 b.png
- Planet.caption
- Size comparison of HAT-P-7b (gray) with Jupiter.
- Planet.discoverer
- HATNet Project
- Planet.discovery_site
- HAT-7 telescope at Fred Lawrence Whipple Observatory and HAT-8 at Mauna Kea Observatory
- Planet.discovered
- March 5, 2008
- Planet.discovery_method
- Transit
- Planet.inclination
- 85.7
- Planet.star
- HAT-P-7
- Planet.mean_radius
- 1.64
- Planet.density
- 0.54 g cm−3
- Planet.surface_grav
- 1.77 g
- Planet.single_temperature
- 2730 K
via Wikipedia infobox
Exoplanet data
- Host star
- HAT-P-7
- Discovered
- 2008
- Discovered by
- HATNet
- Orbital period
- 2.20 days
- Radius
- 16.93 × Earth
- Mass
- 584.81 × Earth
- Equilibrium temp
- 2733 K
- Distance
- 341.08 pc
via NASA Exoplanet Archive
Wikidata facts
- Instance of
- star
- Constellation
- Cygnus
- Parent body
- HAT-P-7
- Diameter
- 209000
- Radius
- 1.51
- Mass
- 1.79
- Orbital period
- 2.20473825
- Image
- Exoplanet Comparison HAT-P-7 b.png
Show 18 more facts
- Commons category
- HAT-P-7 b
- time of discovery or invention
- 2008-06-00
- catalog code
- Kepler-2b
- discovery method
- transit method
- site of astronomical discovery
- HATNet Project
- discoverer or inventor
- Kepler Space Telescope
- right ascension
- 292.24730755480870
- declination
- 47.96950451412388
- epoch
- J2000.0
- orbital eccentricity
- 0.004
- orbital inclination
- 83.5
- angular distance
- 0.000118
- temperature
- 2121.0
- semi-major axis of an orbit
- 0.039
- right ascension component of proper motion
- -18.281
- declination component of proper motion
- 8.910
- parallax
- 2.9031
- argument of periapsis
- 204
Sources (2)
via Wikidata · CC0
~5 min read
Encyclopedic overview
7 sectionsContents
- Discovery
- History
- Characteristics
- Weather
- See also
- References
- External links
HAT-P-7b (or Kepler-2b) is an extrasolar planet discovered in 2008. It orbits very close to its host star and is larger than Jupiter. Due to the extreme heat that it receives from its star, the dayside temperature is predicted to be , while nightside temperatures are . HAT-P-7b is also one of the darkest planets ever observed, with an albedo of less than 0.03—meaning it absorbs more than 97% of the visible light that strikes it.
==Discovery== The HATNet Project telescopes HAT-7, located at the Smithsonian Astrophysical Observatory's Fred Lawrence Whipple Observatory in Arizona, and HAT-8, installed on the rooftop of Smithsonian Astrophysical Observatory's Submillimeter Array building atop Mauna Kea, Hawaii, observed 33,000 stars in HATNet field G154, on nearly every night from late May to early August 2004. The light curves resulting from the 5140 exposures obtained were searched for transit signals and a very significant periodic drop in brightness was detected in the star GSC 03547–01402 (HAT-P-7), with a depth of approximately 7.0 millimagnitude, a period of 2.2047 days, and a duration of 4.1 hours.
Excerpted from Wikipedia’s “HAT-P-7 b” article, available under the CC BY-SA 4.0 licence.