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HD 159243, HIP85911

HD 159243 is a white to yellow star that can be located in the constellation of Ophiuchus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it. It is calculated at being 1.250 Billion Years old. This information comes from ExoPlanet. HD 159243 has at least 2 Extrasolar Planets believed to be in orbit around the star.

HD 159243's Alternative Names

HIP85911 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD159243.

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+05 3419.

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

Location of HD 159243

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 HD 159243, the location is 17h 33m 21.58 and +05° 42` 02.4 .

Proper Motion of HD 159243

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 22.43 ± 0.70 miliarcseconds/year towards the north and -54.41 ± 1.14 miliarcseconds/year east if we saw them in the horizon.

HD 159243 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 1.46 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, Mass) of HD 159243

HD 159243 has a spectral type of G0. This means the star is a white to yellow star. The star is 7,344.00 Parsecs from the Galactic Centre or terms of Light Years is 23,953.44 s. The star has a B-V Colour Index of 0.57 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,945 Kelvin.

HD 159243 Radius has been calculated as being 1.12 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 781,700.21.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.13. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 1.13 times that of the Sun's. 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.

The star's metallicity is 0.050000, 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 1.25 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 159243 Apparent and Absolute Magnitudes

HD 159243 has an apparent magnitude of 8.65 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 4.47 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.45. 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 159243

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.58 which gave the calculated distance to HD 159243 as 223.71 light years away from Earth or 68.59 parsecs. It would take a spaceship travelling at the speed of light, 223.71 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 14.45 which put HD 159243 at a distance of 225.72 light years or 69.20 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,344.00 Parsecs or 23,953.44 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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HD 159243 Facts

Visual Facts


Primary / Proper / Traditional NameHD 159243
Alternative NamesHD 159243, HIP 85911, BD+05 3419
Spectral TypeG0
Multiple Star SystemNo / Unknown
Star TypeStar
Colour white to yellow
GalaxyMilky Way
ConstellationOphiuchus
Age1.25 Billion Years Old
Metalicity0.0500
Absolute Magnitude4.47 / 4.45
Visual / Apparent Magnitude8.65
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)17h 33m 21.58
Declination (Dec.)+05° 42` 02.4
Galactic Latitude19.95 degrees
Galactic Longitude29.08 degrees
1997 Distance from Earth14.58 Parallax (milliarcseconds)
 223.71 Light Years
 68.59 Parsecs
2007 Distance from Earth14.45 Parallax (milliarcseconds)
 225.72 Light Years
 69.20 Parsecs
Galacto-Centric Distance23,953.44 Light Years / 7,344.00 Parsecs
Proper Motion Dec.22.43 ± 0.70 milliarcseconds/year
Proper Motion RA.-54.41 ± 1.14 milliarcseconds/year
B-V Index0.57
Iron Abundance-0.01 ± 0.08 Fe/H
Stellar Luminosity (Lsun)1.46

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count2

Estimated Facts


Calculated Effective Temperature5,945 Kelvin
Mass Compared to the Sun1.13

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 159243


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HD 159243 bConfirmed0.0512.6200.0220130.11223.0002013.000
HD 159243 cConfirmed0.13248.4000.07520130.869.0002013.000

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