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WASP-138

Primary Facts on WASP-138

  • WASP-138's star type is star that can be located in the constellation of Cetus. The description is based on the spectral class.
  • WASP-138 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F9) of the star, the star's colour is blue to white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • WASP-138 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • The star is calculated at being about 1004.57 light years away from us.

Location of WASP-138

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-138, the location is 02h 46m 33.37 and 00° 27` 50.00 .

Physical Properties (Colour, Metallicity, Radius) of WASP-138

WASP-138 has a spectral type of F9. This means the star is a blue to white star.

WASP-138 has been calculated as 1.36 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 946,288.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

The star's metallicity is 0.100000, 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-138 Apparent and Absolute Magnitudes

WASP-138 has an apparent magnitude of 11.81 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 4.37 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-138

The Parallax of the star is given as 3.25 which gives a calculated distance to WASP-138 of 1004.57 light years from the Earth or 308.00 parsecs. It would take a spaceship travelling at the speed of light, 1004.57 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 63,529,117.65 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-138 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameWASP-138
Spectral TypeF9
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
Colour blue to white
GalaxyMilky Way
ConstellationCetus
Metalicity0.1000
Visual / Apparent Magnitude11.81
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)02h 46m 33.37
Declination (Dec.)00° 27` 50.00
Distance from Earth3.25 Parallax (milliarcseconds)
 1004.57 Light Years
 308.00 Parsecs
 63,529,117.65 Astronomical Units

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Facts


Radius (x the Sun)1.36

Sources and Links


Sourcehttp://www.exoplanets.eu

List of Extrasolar Planets orbiting WASP-138


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
WASP-138 bConfirmed0.083.63420160.049488.500

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