Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>KELT-2A</td></tr><tr> <td colspan="2">Constellation</td> <td>Auriga</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>06h 10m 39s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+30° 57′ 25″</td></tr><tr><td colspan="2">Distance</td><td>419 ± 15[1] ly
(128.6 ± 4.7[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F7V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.5504 ± 0.00086 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>4.1137913 ± 0.00001 d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>88.56 ± 1.14°</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>90°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2455974.60338 ± 0.00083 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>161.1 ± 7.8 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>1.524 ± 0.088[1] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.290 ± 0.057[1] Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>940 ± 90[1] kg m-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>22.7 m/s² (2.3 g)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>7 June 2012</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>KELT-North</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 419 light-years away in the constellation of Auriga.[1] It was discovered by the KELT-North survey via the transit method, so both its mass and radius are known quite precisely. As of its discovery KELT-2Ab is the fifth brightest transiting Hot Jupiter known that has a well constrained mass. This makes the KELT-2A system a promising target for future space- and ground-based follow-up observations to learn about the planet's atmosphere.

The star KELT-2A is a member of the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 AU away.

See also Edit

References Edit

External links Edit

Coordinates: Sky map 06h 10m 39s, +30° 57′ 25″

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