Extrasolar planet List of extrasolar planets
Size comparison of HAT-P-12b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>HAT-P-12</td></tr><tr> <td colspan="2">Constellation</td> <td>Canes Venatici</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>13h 57m 434s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+43° 29′ 37″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>12.84</td></tr><tr><td colspan="2">Distance</td><td>464.77 ± 190 ly
(142.5 ± 13.7 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K4</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0384 ± 0.0003[1] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0 (assumed)[1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3.2130598 ± 0.0000021[1] d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>89.0 ± 0.4[1]°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2,454,419.19556 ± 0.00020[1] JD</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>0.211 ± 0.012[1] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>0.959 ± 0.029[1] Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>295 ± 25[1] kg m-3</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 29, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Hartman et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit</td></tr><tr> <td colspan="2">Other detection methods</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Cambridge, Massachusetts</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
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HAT-P-12b is an extrasolar planet approximately 465 light years away from Earth, orbiting the 13th magnitude K-type star HAT-P-12, which is located in Canes Venatici constellation. It is a transiting hot Jupiter that was discovered by the HATNet Project on April 29, 2009.

HAT-P-12b is a H/He-dominated gas giant planet with a core mass of 11.3+2.6
M and is moderately irradiated by its low-metallicity host star.[2] Therefore, HAT-P-12b is most likely an H/He-dominated planet with a core of perhaps ~10 M, and a total metal fraction of ~15%. This makes HAT-P-12b the least massive H/He-dominated gas giant planet found to date; the previous record holder was Saturn.[1]

References Edit

External links Edit


Coordinates: Sky map 13h 57m 434s, +43° 29′ 37″

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