HAT-P-7b
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) K, while nightside temperatures are 2,211–2,238 K (3,520–3,569 °F; 1,938–1,965 °C). 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.
Size comparison of HAT-P-7b (gray) with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | HATNet Project |
| Discovery site | HAT-7 telescope at Fred Lawrence Whipple Observatory and HAT-8 at Mauna Kea Observatory |
| Discovery date | March 5, 2008 |
| Transit | |
| Designations | |
| Kepler-2b, KOI-2.01 | |
| Orbital characteristics | |
| 0.03813±0.00036 AU | |
| Eccentricity | <0.0040 |
| 2.204737±0.000017 d | |
| Inclination | 85.7+3.5 −3.1 |
| Star | HAT-P-7 |
| Physical characteristics | |
Mean radius | 1.64±0.11 RJ |
| Mass | 1.806±0.036 MJ |
Mean density | 0.54 g cm−3 |
| 17.36 m/s2 (57.0 ft/s2) 1.77 g | |
| Temperature | 2730+150 −100 K |
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