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HD 191806

HD 191806 Facts

  • HD 191806 is a star that can be located in the constellation of Cygnus. The description is based on the spectral class.
  • HD 191806 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 2.900 Billion Years old. This information comes from ExoPlanet.
  • HD 191806 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 226.35 light years away from us. Distance

HD 191806's Alternative Names

HIP99306 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD191806.

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+51 2782.

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

Location of HD 191806

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 191806, the location is 20h 09m 28.20 and +52° 16` 34.0 .

Proper Motion of HD 191806

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 90.05 ± 0.42 milliarcseconds/year towards the north and 113.90 ± 0.50 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 191806

HD 191806 Colour and Temperature

Based on the star's spectral type of K0 , HD 191806's colour and type is orange to red star. The star has a B-V Colour Index of 0.64 which means the star's temperature is about 5,784 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 191806 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 2.58 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 191806 Radius

HD 191806 estimated radius has been calculated as being 1.65 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,145,234.30.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 1.5574307501058210655754169048. 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 191806 Mass

The HD 191806's solar mass is 1.14 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 191806 Metalicity

The star's metallicity is 0.300000, 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 191806 Estimated Age

The star is believed to be about 2.90 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 191806 Apparent and Absolute Magnitudes

HD 191806 has an apparent magnitude of 8.09 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 3.76 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.88. 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 191806

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.61000 which gave the calculated distance to HD 191806 as 239.65 light years away from Earth or 73.48 parsecs. If you want that in miles, it is about 1,408,812,570,683,452.14, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 14.41000 which put HD 191806 at a distance of 226.35 light years or 69.40 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 14,314,677.81 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 7,397.00 Parsecs or 24,126.30 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 191806

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)
Walking437,948,518,493.54
Car1201,264,950,616.45
Airbus A380736206,241,948.33
Speed of Sound (Mach 1)767.269197,836,839.46
Concorde (Mach 2)1,534.5498,918,290.81
New Horizons Probe33,0004,599,820.42
Speed of Light670,616,629.00226.35

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 191806 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 191806
Alternative NamesHD 191806, HIP 99306, BD+51 2782
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationCygnus
Age2.90 Billion Years Old
Metalicity0.3000
Absolute Magnitude 3.76 / 3.88
Visual / Apparent Magnitude8.09
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 09m 28.20
Declination (Dec.)+52° 16` 34.0
Galactic Latitude10.30126607 degrees
Galactic Longitude87.04540656 degrees
1997 Distance from Earth13.61000 Parallax (milliarcseconds)
 239.65 Light Years
 73.48 Parsecs
2007 Distance from Earth14.41000 Parallax (milliarcseconds)
 226.35 Light Years
 69.40 Parsecs
 14,314,677.81 Astronomical Units
Galacto-Centric Distance24,126.30 Light Years / 7,397.00 Parsecs
Proper Motion Dec.90.05000 ± 0.42000 milliarcseconds/year
Proper Motion RA.113.90000 ± 0.50000 milliarcseconds/year
B-V Index0.64
Iron Abundance0.1900 ± 0.07 Fe/H
Stellar Luminosity (Lsun)2.5800000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Calculated Facts


Radius (x the Sun)1.56
Effective Temperature5,784 Kelvin
Mass Compared to the Sun1.14

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 191806


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
HD 191806 bConfirmed0.631606.3000.25920162.8

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