Extrasolar planet List of extrasolar planets
Size comparison of HAT-P-3b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>HAT-P-3</td></tr><tr> <td colspan="2">Constellation</td> <td>Ursa Major</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>13h 44m 23s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+48° 01′ 43″</td></tr><tr><td colspan="2">Distance</td><td>457 ± 42 ly
(140 ± 13 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K[1]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.03894 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>2.899703 d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>87.24°</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>?°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2454218.7598 ± 0.0029 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>89.1 ± 2.0 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>0.599 ± 0.026[1] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>0.890 ± 0.046[1] Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>1060 ± 170[1] kg m-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>12.3 m/s² (1.25 g)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>28 July 2007</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>Published</td></tr>

File:HAT-P-3 b rv.pdf

HAT-P-3b is an extrasolar planet that orbits the star HAT-P-3 approximately 457 light-years away in the constellation of Ursa Major. It was discovered by the HATNet Project via the transit method and confirmed with Doppler spectrography, so both its mass and radius are known quite precisely; based on these figures it is predicted that the planet has about 75 Earth masses worth of heavy elements in its core, making it similar to the planet HD 149026b.[1]

In 2013, this planet was photometrically observed by Spitzer space telescope which characterized its near-zero eccentricity and low albedo.[2]

See also Edit

References Edit

  1. 1.0 1.1 1.2 1.3 1.4 (2007). HAT-P-3b: A Heavy-Element-rich Planet Transiting a K Dwarf Star. The Astrophysical Journal Letters 666 (2): L121–L124.
  2. (2013). Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b. The Astrophysical Journal 770 (2).

External links Edit


Coordinates: Sky map 13h 44m 23s, +48° 01′ 43″

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