Universe Guide

ADS 9731

ADS 9731 Facts

  • ADS 9731 is a star that can be located in the constellation of Corona Borealis. The description is based on the spectral class.
  • ADS 9731 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F5) of the star, the star's colour is yellow to white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 2.80 Billion of Years but could be as young as 2.50 to 3.10 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 359.61 light years away from us. Distance

ADS 9731's Alternative Names

HIP76563 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD139691.

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+36 2626.

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

Location of ADS 9731

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 ADS 9731, the location is 15h 38m 12.96 and +36° 14` 48.3 .

Radial Velocity and Proper Motion of ADS 9731

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 31.28 ± 4.31 milliarcseconds/year towards the north and -56.90 ± 5.48 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 -34.35000 km/s with an error of about 0.10 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.

Physical Properties of ADS 9731

ADS 9731 Colour and Temperature

Based on the star's spectral type of F5 , ADS 9731's colour and type is yellow to white star. The star has a B-V Colour Index of 1.7 which means the star's temperature is about 3,456 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

ADS 9731 Radius

ADS 9731 estimated radius has been calculated as being 8.78 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,112,476.37.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 11.059555632580102542111368361. 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.

ADS 9731 Iron Abundance

ADS 9731 Iron Abundance is -0.14 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

ADS 9731 Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 2.80 Billion years old but could be between 2.50 and 3.10 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

ADS 9731 Apparent and Absolute Magnitudes

ADS 9731 has an apparent magnitude of 7.07 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 2.36 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.86. 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 ADS 9731

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.42000 which gave the calculated distance to ADS 9731 as 285.61 light years away from Earth or 87.57 parsecs. If you want that in miles, it is about 1,678,994,192,834,970.85, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 9.07000 which put ADS 9731 at a distance of 359.61 light years or 110.25 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 22,740,536.43 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.

Travel Time to ADS 9731

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)
Airbus A380736327,663,649.39
Speed of Sound (Mach 1)767.269314,310,164.95
Concorde (Mach 2)1,534.54157,154,877.65
New Horizons Probe33,0007,307,892.30
Speed of Light670,616,629.00359.61

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 ADS 9731 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameADS 9731
Alternative NamesHD 139691, HIP 76563, BD+36 2626
Spectral TypeF5
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourYellow - White
GalaxyMilky Way
ConstellationCorona Borealis
Age2.80 Billion Years Old
Age Range2.50 - 3.10 Billion Years Old
Absolute Magnitude 2.36 / 1.86
Visual / Apparent Magnitude7.07
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 38m 12.96
Declination (Dec.)+36° 14` 48.3
Galactic Latitude53.66403837 degrees
Galactic Longitude58.06168262 degrees
1997 Distance from Earth11.42000 Parallax (milliarcseconds)
 285.61 Light Years
 87.57 Parsecs
2007 Distance from Earth9.07000 Parallax (milliarcseconds)
 359.61 Light Years
 110.25 Parsecs
 22,740,536.43 Astronomical Units
Proper Motion Dec.31.28000 ± 4.31000 milliarcseconds/year
Proper Motion RA.-56.90000 ± 5.48000 milliarcseconds/year
B-V Index1.7
Radial Velocity-34.35000 ± 0.10 km/s
Iron Abundance-0.1400 ± 0.08 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)11.06
Effective Temperature3,456 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
139691+36 2626.0A7.00000-59.0000049.00000F5Yellow/White

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