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WASP-4b
Extrasolar planet List of extrasolar planets
300px
Size comparison of WASP-4b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>WASP-4</td></tr><tr> <td colspan="2">Constellation</td> <td>Phoenix</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>23h 34m 15.06s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−42° 03′ 41.1″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>12.5[2]</td></tr><tr><td colspan="2">Distance</td><td>1000 ± 160 ly
(300 ± 50[2] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G7V[2]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.02255+0.00095
−0.00065
[3] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.0[3]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1.3382324+0.0000017
−0.0000029
[3] d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>89.35+0.64
−0.49
[3]°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2454383.313070+0.000045
−0.000074
HJD[3]</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>247.6+13.9
−6.8
[3] m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>1.21+0.13
−0.08
[3] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.304+0.054
−0.042
[3] Template:Jupiter radius</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>1650 ± 30[3] K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>October 31, 2007[4]</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Wilson et al. (SuperWASP)</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>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
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

WASP-4b is an extrasolar planet approximately 1,000 light-years away in the constellation of Phoenix.[2] The planet was discovered orbiting the star WASP-4 in October 2007. The planet's mass and radius indicate that it is a gas giant, similar to Jupiter.[4] WASP-4b is close enough to its star to be classified as a hot Jupiter and has an atmospheric temperature of approximately 1650 K.[2][3]

File:WASP-4 b rv.pdf

The planet was the discovered by the SuperWASP project using cameras in South Africa.[4] After its discovery, the mass of the WASP-4 b was determined by measuring the radial velocity of WASP-4, which confirmed that the object that caused the transit was a planet.

References Edit

  1. 1.0 1.1 WASP-4, entry, SIMBAD. Accessed on line June 19, 2008.
  2. 2.0 2.1 2.2 2.3 2.4 WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere, D. M. Wilson et al., Astrophysical Journal Letters 675, #2 (March 2008), pp. L113–L116. Template:Bibcode. Template:Doi.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Table 3, Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b, M. Gillon et al., Astronomy and Astrophysics 496, #1 (2009), pp. 259–267, Template:Doi, Template:Bibcode.
  4. 4.0 4.1 4.2 UK planet hunters announce three new finds, press release, WASP project. Accessed on line June 19, 2008.

External links Edit

Template:Commonscat-inline

Coordinates: Sky map 23h 34m 15.06s, −42° 03′ 41.1″


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