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HD 164509

HD 164509 Facts

HD 164509's Alternative Names

HIP88268 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD164509.

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+00 3837.

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

Location of HD 164509

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 164509, the location is 18h 01m 31.23 and +00° 06` 16.6 .

Radial Velocity and Proper Motion of HD 164509

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 -20.98 ± 0.66 miliarcseconds/year towards the north and -7.40 ± 0.97 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 13.63 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.

HD 164509 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 1.42 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 164509

HD 164509 has a spectral type of G5. This means the star is a white to yellow star. The star is 7,354.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,986.05 s. The star has a B-V Colour Index of 0.66 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,739 Kelvin.

HD 164509 Radius has been calculated as being 1.17 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 815,963.83.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 1.19. 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 0.210000, 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 stars age according to Hipparcos data files put the star at an age of about 8.00 Billion years old but could be between 5.40 and 10.10 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 164509 Apparent and Absolute Magnitudes

HD 164509 has an apparent magnitude of 8.10 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 4.53 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.50. 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 164509

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 19.30 which gave the calculated distance to HD 164509 as 169.00 light years away from Earth or 51.81 parsecs. It would take a spaceship travelling at the speed of light, 169.00 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 19.07 which put HD 164509 at a distance of 171.03 light years or 52.44 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 10,816,451.07 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 7,354.00 Parsecs or 23,986.05 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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Additional HD 164509 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 164509
Alternative NamesHD 164509, HIP 88268, BD+00 3837
Spectral TypeG5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourWhite to Yellow
GalaxyMilky Way
ConstellationOphiuchus
Age8.00 Billion Years Old
Age Range5.40 - 10.10 Billion Years Old
Metalicity0.2100
Absolute Magnitude 4.53 / 4.50
Visual / Apparent Magnitude8.10
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 01m 31.23
Declination (Dec.)+00° 06` 16.6
Galactic Latitude11.14 degrees
Galactic Longitude27.26 degrees
1997 Distance from Earth19.30 Parallax (milliarcseconds)
 169.00 Light Years
 51.81 Parsecs
2007 Distance from Earth19.07 Parallax (milliarcseconds)
 171.03 Light Years
 52.44 Parsecs
 10,816,451.07 Astronomical Units
Galacto-Centric Distance23,986.05 Light Years / 7,354.00 Parsecs
Proper Motion Dec.-20.98 ± 0.66 milliarcseconds/year
Proper Motion RA.-7.40 ± 0.97 milliarcseconds/year
B-V Index0.66
Radial Velocity13.63 ± 0.20 km/s
Iron Abundance0.18 ± 0.05 Fe/H
Eccentricity0.21
Semi-Major Axis8678.00
Stellar Luminosity (Lsun)1.42

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Calculated Facts


Radius (x the Sun)1.19
Effective Temperature5,739 Kelvin
Mass Compared to the Sun1.13

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 164509


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
HD 164509 bConfirmed0.09282.4000.2620110.875324.000

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