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HD 169830

HD 169830 Facts

HD 169830's Alternative Names

HIP90485 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD169830.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 66 G. Sagittarii. There are no stars with a Gould designation in Ursa Major for example.

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

Location of HD 169830

The location of the main sequence 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 169830, the location is 18h 27m 49.48 and -29° 49` 00.8 .

Radial Velocity and Proper Motion of HD 169830

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 16.11 ± 0.26 milliarcseconds/year towards the north and -1.39 ± 0.41 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 -17.74 km/s with an error of about 0.09 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 169830 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 5.18 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 169830

HD 169830 Colour and Temperature

HD 169830 has a spectral type of F8V. This means the star is a yellow to white main sequence star. The star has a B-V Colour Index of 0.51 which means the star's temperature is about 6,243 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

HD 169830 Radius

Radius has been calculated as being 1.91 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,332,203.98.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 1.93. 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 1.40 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 2.30 Billion years old but could be between 2.10 and 2.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 169830 Apparent and Absolute Magnitudes

HD 169830 has an apparent magnitude of 5.90 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 3.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.08. 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 169830

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 27.53 which gave the calculated distance to HD 169830 as 118.48 light years away from Earth or 36.32 parsecs. If you want that in miles, it is 79,454,658,204.

In 2007, Hipparcos data was revised with a new parallax of 27.32 which put HD 169830 at a distance of 119.39 light years or 36.60 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 7,549,239.30 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 7,364.00 Parsecs or 24,018.67 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 169830

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)
Walking420,016,229,834.08
Car120667,207,661.14
Airbus A380736108,783,857.79
Speed of Sound (Mach 1)767.269104,350,520.27
Concorde (Mach 2)1,534.5452,175,192.13
New Horizons Probe33,0002,426,209.68
Speed of Light670,616,629.00119.39

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 169830 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 169830
Alternative NamesHD 169830, HIP 90485, 66 G. Sagittarii
Spectral TypeF8V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
ConstellationSagittarius
Age2.30 Billion Years Old
Age Range2.10 - 2.40 Billion Years Old
Metalicity0.2100
Absolute Magnitude 3.10 / 3.08
Visual / Apparent Magnitude5.90
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 27m 49.48
Declination (Dec.)-29° 49` 00.8
Galactic Latitude-8.47 degrees
Galactic Longitude3.69 degrees
1997 Distance from Earth27.53 Parallax (milliarcseconds)
 118.48 Light Years
 36.32 Parsecs
2007 Distance from Earth27.32 Parallax (milliarcseconds)
 119.39 Light Years
 36.60 Parsecs
 7,549,239.30 Astronomical Units
Galacto-Centric Distance24,018.67 Light Years / 7,364.00 Parsecs
Proper Motion Dec.16.11 ± 0.26 milliarcseconds/year
Proper Motion RA.-1.39 ± 0.41 milliarcseconds/year
B-V Index0.51
Radial Velocity-17.74 ± 0.09 km/s
Iron Abundance0.14 ± 0.01 Fe/H
Eccentricity0.15
Semi-Major Axis8591.00
Stellar Luminosity (Lsun)5.18

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count2

Estimated Calculated Facts


Radius (x the Sun)1.93
Effective Temperature6,243 Kelvin
Mass Compared to the Sun1.40

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 169830


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
HD 169830 bConfirmed225.6200.3120000.81148.000
HD 169830 cConfirmed2102.0000.3320033.6252.000

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