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HAT-P-7b
Extrasolar planet List of extrasolar planets
300px
Size comparison of HAT-P-7b (gray) with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>HAT-P-7</td></tr><tr> <td colspan="2">Constellation</td> <td>Cygnus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>19h 28m 59s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+47° 58′ 10″</td></tr><tr><td colspan="2">Distance</td><td>1044+163
−130
 ly
(320+50
−40
 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F8</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0377 ± 0.0005 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>2.2047299 (± 4×10-6) d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>85.7+3.5
−3.1
°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2453790.2593±0.001 JD</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>1.776+0.077
−0.049
MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.363+0.195
−0.087
Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>930 kg m-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>24.75 m/s² (2.524 g)</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>2730+150
−100
K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>March 6, 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>HATNet Project</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit</td></tr><tr> <td colspan="2">Other detection methods</td> <td>Radial velocity
Reflection/emission modulations
Ellipsoidal light variations</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr> <tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HAT-P-7b (or Kepler-2b) is an extrasolar planet discovered in 2008. It orbits very close to its host star, and is both larger and more massive than Jupiter. Due to the extreme heat it receives from its star, the dayside temperature is predicted to be 2730+150
−100
K.

HistoryEdit

File:HAT-P-7 b rv.pdf

The GSC 03547-01402 system is within the field of view of the now operational Kepler Mission spacecraft,[1] which confirmed the transit and orbital properties of the planet with significantly improved confidence and observed occultation and light curve characteristics consistent with a strongly absorbing atmosphere with limited advection to the night side. In testing itself on HAT-P-7b, Kepler proved it was sensitive enough to detect Earth-like planets.[2]

In August 2009, it was announced that HAT-P-7b may have a retrograde orbit, based upon measurements of the Rossiter-McLaughlin effect.[3][4][5] This announcement came only a day after the announcement of the first planet discovered with such an orbit, WASP-17b.

In January 2010, it was announced that HAT-P-7b was detected through ellipsoidal light variations, the first detection of such kind. This method analyses the brightness variation caused by the rotation of a star as its shape tidally distorted by the planet.[6]

On July 4, 2011, HAT-P-7b was the subject of the Hubble Space Telescope's one millionth science observation.[7]

See alsoEdit

ReferencesEdit

External linksEdit

Coordinates: Sky map 19h 28m 59s, +47° 58′ 10″


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