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HD 118203

HD 118203 Facts

  • HD 118203 is a star that can be located in the constellation of Ursa Major. The description is based on the spectral class.
  • HD 118203 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K0) of the star, the star's colour is orange to red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • It is calculated at being 4.600 Billion Years old. This information comes from ExoPlanet.
  • HD 118203 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • The star is calculated at being about 288.90 light years away from us. Distance

HD 118203's Alternative Names

HIP66192 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD118203.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+54 1609.

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

Location of HD 118203

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 HD 118203, the location is 13h 34m 02.62 and +53° 43` 43.4 .

Radial Velocity and Proper Motion of HD 118203

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 -77.84 ± 0.51 milliarcseconds/year towards the north and -87.39 ± 0.70 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 -29.07000 km/s with an error of about 0.24 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 HD 118203

HD 118203 Temperature and Colour

Based on the star's spectral type of K0 , HD 118203's colour and type is orange to red star. The star has a B-V Colour Index of 0.69 which means the star's temperature is about 5,671 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 118203 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 4.46 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 118203 Radius

HD 118203 estimated radius has been calculated as being 2.11 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,465,669.46.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HD 118203 Mass

The HD 118203's solar mass is 1.23 times that of our star, the Sun. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

HD 118203 Metalicity

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.

HD 118203 Estimated Age

The star is believed to be about 4.60 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.

HD 118203 Apparent and Absolute Magnitudes

HD 118203 has an apparent magnitude of 8.05 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 3.31 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 HD 118203

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.29000 which gave the calculated distance to HD 118203 as 288.90 light years away from Earth or 88.57 parsecs. If you want that in miles, it is about 1,698,334,870,312,744.93, based on 1 Ly = 5,878,625,373,183.61 miles.

The star's Galacto-Centric Distance is 7,414.00 Parsecs or 24,181.75 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 HD 118203

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)
Walking448,435,286,029.53
Car1201,614,509,534.32
Airbus A380736263,235,250.16
Speed of Sound (Mach 1)767.269252,507,457.12
Concorde (Mach 2)1,534.54126,253,564.01
New Horizons Probe33,0005,870,943.76
Speed of Light670,616,629.00288.90

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 HD 118203 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 118203
Alternative NamesHD 118203, HIP 66192, BD+54 1609
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationUrsa Major
Age4.60 Billion Years Old
Metalicity0.1000
Absolute Magnitude 3.31
Visual / Apparent Magnitude8.05
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 34m 02.62
Declination (Dec.)+53° 43` 43.4
Galactic Latitude62.26117216 degrees
Galactic Longitude109.34401895 degrees
Distance from Earth11.29000 Parallax (milliarcseconds)
 288.90 Light Years
 88.57 Parsecs
 18,268,746.59 Astronomical Units
Galacto-Centric Distance24,181.75 Light Years / 7,414.00 Parsecs
Proper Motion Dec.-77.84000 ± 0.51000 milliarcseconds/year
Proper Motion RA.-87.39000 ± 0.70000 milliarcseconds/year
B-V Index0.69
Radial Velocity-29.07000 ± 0.24 km/s
Iron Abundance0.1700 ± 0.07 Fe/H
Eccentricity0.35750
Semi-Major Axis5115.0000000
Stellar Luminosity (Lsun)4.4600000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Calculated Facts


Radius (x the Sun)2.11
Effective Temperature5,671 Kelvin
Mass Compared to the Sun1.23

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 118203


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
HD 118203 bConfirmed6.1330.294320050.07332.700

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