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HAT-P-8b
Extrasolar planet List of extrasolar planets
300px
Size comparison of HAT-P-8b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>GSC 02757-01152</td></tr><tr> <td colspan="2">Constellation</td> <td>Pegasus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 52m 09.862s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+35° 26′ 49.59″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>10.17</td></tr><tr><td colspan="2">Distance</td><td>750 ± 50 ly
(230 ± 15 pc)</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0487 ± 0.00026 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>3.07632 ± 0.000004 d</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>173 km/s</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>87.5+1.9
−0.9
°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2,454,437.67582 ± 0.00034 JD</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>1.52+0.18
−0.16
MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.5+0.08
−0.06
Template:Jupiter radius</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>December 5, 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">Discovery status</td> <td>Unpublished</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-8b is an extrasolar planet located approximately 750 light years away in the constellation of Pegasus, orbiting the 10th magnitude star GSC 02757-01152. This planet was discovered by transit on December 5, 2008. Despite the designation as HAT-P-8b, it is the 11th planet discovered by the HATNet Project. The mass of the planet is 50% more than Jupiter while the radius is also 50% more than Jupiter. The mass of this planet is exact since the inclination of the orbit is known, typical for transiting planets. This is a so-called “hot Jupiter” because this Jupiter-like gas giant planet orbits in a really close torch orbit around the star, making this planet extremely hot (in the order of a thousand kelvins). The distance from the star is roughly 20 times smaller that of Earth from the Sun, which places the planet roughly 8 times closer to its star than Mercury is from the Sun. The “year” on this planet lasts only 3 days, 1 hour, 49 minutes, and 54 seconds, compared with Earth's 365 days, 6 hours, 9 minutes, and 10 seconds in a sidereal year.[1]

See also Edit

References Edit

  1. (2009). Discovery of a Transiting Planet and Eight Eclipsing Binaries in HATNet Field G205. The Astrophysical Journal 704 (2): 1107–1119.

External links Edit

Template:Commonscat-inline

Coordinates: Sky map 22h 52m 09.862s, +35° 26′ 49.59″


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