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HD 159243

HD 159243 Facts

  • HD 159243 is a star that can be located in the constellation of Ophiuchus. The description is based on the spectral class.
  • HD 159243 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G0) of the star, the star's colour is yellow .
  • 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 225.72 light years away from us. Distance

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 objects' 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 object 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 milliarcseconds/year towards the north and -54.41 ± 1.14 milliarcseconds/year east if we saw them in the horizon. . 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 159243

HD 159243 Temperature and Colour

Based on the star's spectral type of G0 , HD 159243's colour and type is yellow star. The star has a B-V Colour Index of 0.57 which means the star's temperature is about 5,945 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

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.

HD 159243 Radius

HD 159243 estimated 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 1.1338510325185575065472550590. 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 159243 Mass

The HD 159243's solar mass is 1.13 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 159243 Metalicity

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.

HD 159243 Estimated Age

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 14.58000 which gave the calculated distance to HD 159243 as 223.71 light years away from Earth or 68.59 parsecs. If you want that in miles, it is about 1,315,107,282,234,905.39, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 14.45000 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.

Using the 2007 distance, the star is roughly 14,273,425.13 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. 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*.

Travel Time to HD 159243

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)
Walking437,842,896,374.47
Car1201,261,429,879.15
Airbus A380736205,667,915.08
Speed of Sound (Mach 1)767.269197,286,200.14
Concorde (Mach 2)1,534.5498,642,971.51
New Horizons Probe33,0004,587,017.74
Speed of Light670,616,629.00225.72

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 159243 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 159243
Alternative NamesHD 159243, HIP 85911, BD+05 3419
Spectral TypeG0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourYellow
GalaxyMilky Way
ConstellationOphiuchus
Age1.25 Billion Years Old
Metalicity0.0500
Absolute Magnitude 4.47 / 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 Latitude19.94961085 degrees
Galactic Longitude29.07675904 degrees
1997 Distance from Earth14.58000 Parallax (milliarcseconds)
 223.71 Light Years
 68.59 Parsecs
2007 Distance from Earth14.45000 Parallax (milliarcseconds)
 225.72 Light Years
 69.20 Parsecs
 14,273,425.13 Astronomical Units
Galacto-Centric Distance23,953.44 Light Years / 7,344.00 Parsecs
Proper Motion Dec.22.43000 ± 0.70000 milliarcseconds/year
Proper Motion RA.-54.41000 ± 1.14000 milliarcseconds/year
B-V Index0.57
Iron Abundance-0.0100 ± 0.08 Fe/H
Stellar Luminosity (Lsun)1.4600000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count2

Estimated Calculated Facts


Radius (x the Sun)1.13
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 AxisPeriastron
HD 159243 bConfirmed0.0512.6200.0220130.11223.000
HD 159243 cConfirmed0.13248.4000.07520130.869.000

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