HAT-P-7b

HAT-P-7b
Size comparison of HAT-P-7b (gray) with Jupiter.
Discovery[1]
Discovered byHATNet Project
Discovery siteHAT-7 telescope at Fred Lawrence Whipple Observatory and HAT-8 at Mauna Kea Observatory
Discovery dateMarch 5, 2008
Transit
Designations
Kepler-2b, KOI-2.01[2]
Orbital characteristics
0.03813±0.00036 AU
Eccentricity<0.0040[3]
2.204737±0.000017[4] d
Inclination85.7+3.5
−3.1
StarHAT-P-7
Physical characteristics
1.64±0.11 RJ[5]
Mass1.806±0.036[3] MJ
Mean density
0.54 g cm−3
17.36 m/s2 (57.0 ft/s2)
1.77 g
Temperature2730+150
−100 K

HAT-P-7b (or Kepler-2b) is an extrasolar planet discovered in 2008. It orbits very close to its host star and is larger and more massive than Jupiter. Due to the extreme heat that it receives from its star, the dayside temperature is predicted to be 2,630–2,880 K (4,270–4,720 °F; 2,360–2,610 °C), while nightside temperatures are 2,211–2,238 K (3,520–3,569 °F; 1,938–1,965 °C).[6] 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.[7]

  1. ^ Cite error: The named reference Pál2008 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Bonomo2017 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Morris2013 was invoked but never defined (see the help page).
  5. ^ Rhodes, Michael D.; Puskullu, Caglar; Budding, Edwin; Banks, Timothy S. (2020). "Exoplanet system Kepler-2 with comparisons to Kepler-1 and 13". Astrophysics and Space Science. 365 (4): 77. arXiv:2004.07971. Bibcode:2020Ap&SS.365...77R. doi:10.1007/s10509-020-03789-3. S2CID 215814387.
  6. ^ A Comprehensive Study of Kepler Phase Curves and Secondary Eclipses:Temperatures and Albedos of Confirmed Kepler Giant Planets
  7. ^ WASP-104b is Darker Than Charcoal