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WASP-139 is a orange to red star that can be located in the constellation of Eridanus. The description is based on the spectral class. WASP-139 is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it. It is calculated at being .500 Billion Years old. This information comes from ExoPlanet. WASP-139 has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of WASP-139

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-139, the location is 03h 18m 15.00 and -41° 18` 08.00 .

Physical Properties (Colour, Metallicity, Age) of WASP-139

WASP-139 has a spectral type of K0. This means the star is a orange to red star.

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.

The star is believed to be about 0.50 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

WASP-139 Apparent and Absolute Magnitudes

WASP-139 has an apparent magnitude of 12.40 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 5.59 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-139

The Parallax of the star is given as 4.35 which gives a calculated distance to WASP-139 of 750.18 light years from the Earth or 230.00 parsecs. It would take a spaceship travelling at the speed of light, 750.18 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 47,440,574.87 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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WASP-139 Facts

Visual Facts

Primary / Proper / Traditional NameWASP-139
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
Colour orange to red
GalaxyMilky Way
Age0.50 Billion Years Old
Visual / Apparent Magnitude12.40
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)03h 18m 15.00
Declination (Dec.)-41° 18` 08.00
Distance from Earth4.35 Parallax (milliarcseconds)
 750.18 Light Years
 230.00 Parsecs
 47,440,574.87 Astronomical Units

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Sources and Links


List of Extrasolar Planets orbiting WASP-139

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
WASP-139 bConfirmed0.0175.9240.020160.06288.900

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