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Primary Facts on WASP-4

  • WASP-4's star type is star that can be located in the constellation of Phoenix. The description is based on the spectral class.
  • WASP-4 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G8) of the star, the star's colour is white to yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • WASP-4 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • The star is calculated at being about 978.50 light years away from us.

Location of WASP-4

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For WASP-4, the location is 23h 34m 15.00 and -42° 03` 41.00 .

Physical Properties (Colour, Metallicity, Radius) of WASP-4

WASP-4 has a spectral type of G8. This means the star is a white to yellow star.

WASP-4 has been calculated as 1.15 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 800,170.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

The star's metallicity is 0.090000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

WASP-4 Apparent and Absolute Magnitudes

WASP-4 has an apparent magnitude of 12.60 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 5.21 Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to WASP-4

The Parallax of the star is given as 3.33 which gives a calculated distance to WASP-4 of 978.50 light years from the Earth or 300.00 parsecs. It would take a spaceship travelling at the speed of light, 978.50 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 61,879,010.70 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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Additional WASP-4 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameWASP-4
Spectral TypeG8
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
Colour white to yellow
GalaxyMilky Way
Visual / Apparent Magnitude12.60
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)23h 34m 15.00
Declination (Dec.)-42° 03` 41.00
Distance from Earth3.33 Parallax (milliarcseconds)
 978.50 Light Years
 300.00 Parsecs
 61,879,010.70 Astronomical Units

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Radius (x the Sun)1.15

Sources and Links


List of Extrasolar Planets orbiting WASP-4

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
WASP-4 bConfirmed0.0621.3380.020070.0231288.800

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