Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HAT-P-13</td></tr><tr> <td colspan="2">Constellation</td> <td>Ursa Major[1]</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>08h 39m 31.810s[2]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+47° 21′ 07.25″[2]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>10.62</td></tr><tr><td colspan="2">Distance</td><td>698 ± 39[3] ly
(214 ± 12[3] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G4V[3]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.186+0.018
AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.366 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.006 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.691 ± 0.018</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>428.5 ± 3 d
(1.173 ± 0.008 y)</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>176.7 ± 0.5°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2454890.05 ± 0.48 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>15.2 ± 1 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>21 July 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Bakos et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</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-13c is a substellar object orbiting the star HAT-P-13 located 698 light years away from Earth in the constellation of Ursa Major. A search for transits was negative, however only 72% of the possible transit configurations could be ruled out.[4] With a mass at least 15.2 times that of Jupiter, it may be a massive planet or a small brown dwarf.[3] The gravitational effect of this object on the inner transiting planet HAT-P-13b may allow a precise determination of the inner planet's internal structure.[5]


  1. (1987). Identification of a Constellation From a Position. Publications of the Astronomical Society of the Pacific 99 (617): 695–699. Vizier query form
  2. 2.0 2.1 (2000). The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics 355: L27–L30. Vizier catalog entry
  3. 3.0 3.1 3.2 3.3 (2009). HAT-P-13b,c: A Transiting Hot Jupiter with a Massive Outer Companion on an Eccentric Orbit. The Astrophysical Journal 707 (1): 446–456.
  4. (2010). A multi-site campaign to detect the transit of the second planet in HAT-P-13. Astronomy and Astrophysics 523.
  5. ATYGIN K., BODENHEIMER P. & LAUGHLIN G. , 2009 "Determination of the Interior Structure of Transiting Planets in Multiple-Planet Systems" ApJ. Letters 2009 preprint

External linksEdit

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.