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V986 Herculis, HIP89142

Primary Facts on V986 Herculis

  • V986 Herculis's star type is variable star that can be located in the constellation of Hercules. The description is based on the spectral class.
  • V986 Herculis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 3882.90 light years away from us.

V986 Herculis's Alternative Names

HIP89142 is the reference name for the star in the Hipparcos Star Catalogue.

V986 Herculis has alternative name(s) :- , V986 Her.

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+47 2596.

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

Location of V986 Herculis

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 star is compared to the celestial equator and is expressed in degrees. For V986 Herculis, the location is 18h 11m 34.24 and +47° 39` 34.4 .

Proper Motion of V986 Herculis

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 5.80 ± 0.41 miliarcseconds/year towards the north and 0.49 ± 0.49 miliarcseconds/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 (Colour, Temperature) of V986 Herculis

V986 Herculis has a spectral type of M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,993 Kelvin.

V986 Herculis Radius has been calculated as being 30.08 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,931,407.77.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 57.59. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V986 Herculis Apparent and Absolute Magnitudes

V986 Herculis has an apparent magnitude of 8.03 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 -0.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.35. 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 V986 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.61 which gave the calculated distance to V986 Herculis as 2025.86 light years away from Earth or 621.12 parsecs. It would take a spaceship travelling at the speed of light, 2025.86 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 0.84 which put V986 Herculis at a distance of 3882.90 light years or 1190.48 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 245,552,415.51 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. V986 Herculis brightness ranges from a magnitude of 8.096 to a magnitude of 8.004 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

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 V986 Herculis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV986 Herculis
Alternative NamesHIP 89142, BD+47 2596, V986 Her
Spectral TypeM2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
Absolute Magnitude -0.94 / -2.35
Visual / Apparent Magnitude8.03
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 11m 34.24
Declination (Dec.)+47° 39` 34.4
Galactic Latitude26.15 degrees
Galactic Longitude75.28 degrees
1997 Distance from Earth1.61 Parallax (milliarcseconds)
 2025.86 Light Years
 621.12 Parsecs
2007 Distance from Earth0.84 Parallax (milliarcseconds)
 3882.90 Light Years
 1190.48 Parsecs
 245,552,415.51 Astronomical Units
Proper Motion Dec.5.80 ± 0.41 milliarcseconds/year
Proper Motion RA.0.49 ± 0.49 milliarcseconds/year
B-V Index1.51

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.073
Variable Magnitude Range (Brighter - Dimmer)8.004 - 8.096

Estimated Facts

Calculated Effective Temperature3,993 Kelvin

Sources and Links

SIMBAD SourceLink

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Comments and Questions

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