Universe Guide


WASP-18 Facts

  • WASP-18 is a star that can be located in the constellation of Phoenix. The description is based on the spectral class.
  • WASP-18 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F6) of the star, the star's colour is yellow to white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • It is calculated at being .630 Billion Years old. This information comes from ExoPlanet.
  • WASP-18 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • WASP-18 has a radius that is 1.23 times bigger than the Suns. Radius
  • The star is calculated at being about 324.22 light years away from us. Distance

WASP-18's Alternative Names

HIP7562 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD10069.

More details on objects' alternative names can be found at Star Names .

Location of WASP-18

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 object is compared to the celestial equator and is expressed in degrees. For WASP-18, the location is 01h 37m 25.00 and -45° 40` 40.00 .

Radial Velocity and Proper Motion of WASP-18

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving 18.79 ± 0.95 milliarcseconds/year towards the north and 26.52 ± 1.07 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 2.78000 km/s with an error of about 0.20 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of WASP-18

WASP-18 Colour and Temperature

Based on the star's spectral type of F6 , WASP-18's colour and type is yellow to white star. The star has a B-V Colour Index of 0.49 which means the star's temperature is about 6,140 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

WASP-18 Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 1.61 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

WASP-18 Radius

WASP-18 Radius has been calculated as being 1.23 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 855,834.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

WASP-18 Metalicity

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-18 Estimated Age

The star is believed to be about 0.63 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-18 Apparent and Absolute Magnitudes

WASP-18 has an apparent magnitude of 9.30 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 4.31 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-18

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.06000 which gave the calculated distance to WASP-18 as 324.22 light years away from Earth or 99.40 parsecs. If you want that in miles, it is about 1,905,967,918,493,590.03, based on 1 Ly = 5,878,625,373,183.61 miles.

The star's Galacto-Centric Distance is 7,395.00 Parsecs or 24,119.78 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to WASP-18

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A380736295,417,559.04
Speed of Sound (Mach 1)767.269283,378,219.97
Concorde (Mach 2)1,534.54141,688,925.32
New Horizons Probe33,0006,588,706.77
Speed of Light670,616,629.00324.22

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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Additional WASP-18 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameWASP-18
Alternative NamesHD 10069, HIP 7562
Spectral TypeF6
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourYellow - White
GalaxyMilky Way
Age0.63 Billion Years Old
Absolute Magnitude 4.31
Visual / Apparent Magnitude9.30
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 37m 25.00
Declination (Dec.)-45° 40` 40.00
Galactic Latitude-69.32143406 degrees
Galactic Longitude279.71020933 degrees
Distance from Earth10.06000 Parallax (milliarcseconds)
 324.22 Light Years
 99.40 Parsecs
 20,502,578.88 Astronomical Units
Galacto-Centric Distance24,119.78 Light Years / 7,395.00 Parsecs
Proper Motion Dec.18.79000 ± 0.95000 milliarcseconds/year
Proper Motion RA.26.52000 ± 1.07000 milliarcseconds/year
B-V Index0.49
Radial Velocity2.78000 ± 0.20 km/s
Semi-Major Axis8336.0000000
Stellar Luminosity (Lsun)1.6100000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Calculated Facts

Radius (x the Sun)1.23
Effective Temperature6,140 Kelvin

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting WASP-18

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
WASP-18 bConfirmed0.40.9410.008820090.02047269.00086.000

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