Universe Guide


WASP-18 Facts

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 2.78 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.

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.

Physical Properties (Colour, Temperature, Metallicity, Age, Radius) of WASP-18

WASP-18 Colour and Temperature

WASP-18 has a spectral type of F6. This means the star is a 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 at being .

WASP-18 Radius

WASP-18 has been calculated as 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.

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 0.63 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 10.06 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 217,427,323,454.

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-69.32 degrees
Galactic Longitude279.71 degrees
Distance from Earth10.06 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.18.79 ± 0.95 milliarcseconds/year
Proper Motion RA.26.52 ± 1.07 milliarcseconds/year
B-V Index0.49
Radial Velocity2.78 ± 0.20 km/s
Eccentricity 0.12
Semi-Major Axis8336.00
Stellar Luminosity (Lsun)1.61

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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