Extrasolar planet List of extrasolar planets
Size comparison of HAT-P-9b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>HAT-P-9</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>07h 20m 40.479s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+37° 08′ 26.17″</td></tr><tr><td colspan="2">Distance</td><td>1560 ± 190 ly
(480 ± 60 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0528 ± 0.002 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.0527 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.0529 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>~0.0012</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3.92289 ± 0.00004 d
(0.0107401 y)</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2454417.9077 ± 0.0003 JD</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>0.78 ± 0.09 MJ
(250 M)</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.4 ± 0.06 Template:Jupiter radius
(15 Template:Earth radius)
(96 Mm)</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>380 kg m-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>10.3 m/s² (1.05 g)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 26, 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Shporer et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit (SuperWASP)</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-9b is an extrasolar planet approximately 1560 light years away in the constellation Auriga. This planet was found by the transit method on June 26, 2008. It has a mass 78% that of Jupiter and a radius 140% that of Jupiter. As with most transiting planets, this planet is a hot Jupiter, meaning this Jupiter-like planet orbits extremely close to its parent star, taking only 3.92 days to orbit.[1]

References Edit

  1. (2009). HAT-P-9b: A Low-Density Planet Transiting a Moderately Faint F Star. The Astrophysical Journal 690 (2): 1393–1400.

External linksEdit


Coordinates: Sky map 07h 20m 40.479s, +37° 08′ 26.17″

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