Extrasolar planet List of extrasolar planets
Size comparison of WASP-11b/HAT-P-10b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>WASP-11/HAT-P-10[1]</td></tr><tr> <td colspan="2">Constellation</td> <td>Perseus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>03h 09m 28.55s[2]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+30° 40′ 24.9″[2]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>11.89</td></tr><tr><td colspan="2">Distance</td><td>408+20
[2] ly
[2] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K3V[3]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0439+0.0006
[2] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0[2]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3.7224690 ± 0.0000067[2] d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>88.5 ± 0.6[2]°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2454729.90631 ± 0.00030[2] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>69.1 ± 3.5[2] m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>0.460 ± 0.028[2] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.045+0.050
[2] Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>498 ± 64[2] kg m-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>10.5[2] m/s²</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>1030+26
[2][note 1] K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 1, 2008 (announced)
September 26, 2008 (preprints)</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>West et al. (SuperWASP)
Bakos et al. (HATNet)</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit</td></tr><tr> <td colspan="2">Discovery site</td> <td>SAAO</td></tr><tr> <td colspan="2">Discovery status</td> <td>Independently confirmed</td></tr>

Other designations
WASP-11b, HAT-P-10b

<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>

File:Artist impression Extrasolar planet WASP-11b HAT-P-10b.jpg

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab[4] is an extrasolar planet discovered in 2008. The discovery was announced (under the designation WASP-11b) by press release by the SuperWASP project in April 2008 along with planets WASP-6b through to WASP-15b, however at this stage more data was needed to confirm the parameters of the planets and the coordinates were not given.[5] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.[2] The SuperWASP team's paper appeared as a preprint on the Extrasolar Planets Encyclopaedia on the same day, confirming that the two objects (WASP-11b and HAT-P-10b) were in fact the same, and the teams agreed to use the combined designation.[1]

The planet has the third lowest insolation of the known transiting planets (only Gliese 436 b and HD 17156 b have lower insolation). The temperature implies it falls into the pL class of hot Jupiters: planets which lack significant quantities of titanium(II) oxide and vanadium(II) oxide in their atmospheres and do not have temperature inversions.[6] An alternative classification system for hot Jupiters is based on the equilibrium temperature and the planet's Safronov number.[note 2] In this scheme, for a given temperature, class I planets have high Safronov numbers and tend to be in orbit around cooler host stars, while class II planets have lower Safronov numbers.[7] In the case of WASP-11b/HAT-P-10b, the equilibrium temperature is 1030 K[note 1] and the Safronov number is 0.047±0.003, which means it is located close to the dividing line between the class I and class II planets.[2]


  1. 1.0 1.1 Assumes the planet has zero albedo. Its secondary transit of the planet behind its star has not yet been observed and so the temperature provided is a hypothetical "equilibrium temperature".
  2. The Safronov number is defined as \textstyle \Theta = \frac{1}{2} \left(\frac{\mathrm{Planetary\ escape\ velocity}}{\mathrm{Orbital\ velocity}}\right)^2

See alsoEdit


  1. 1.0 1.1 Schneider, J.. Notes for star WASP-11/HAT-P-10. The Extrasolar Planets Encyclopaedia. Retrieved 2008-09-29.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 (2009). HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf. The Astrophysical Journal 696 (2): 1950–1955.
  3. Template:Cite arxiv
  5. The Planets. SuperWASP. Retrieved 2008-09-26.
  6. Fortney, J. J. et al. (2008). A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres. The Astrophysical Journal 678 (2): 1419–1435.
  7. Hansen, B. M. S. and Barman, T. (2007). Two Classes of Hot Jupiters. The Astrophysical Journal 671: 861–871.

External linksEdit


Coordinates: Sky map 03h 09m 28.55s, +30° 40′ 24.9″de:WASP-11 b

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