Universe GuideSearchTwitterComments

V992 Herculis

V992 Herculis Facts

V992 Herculis's Alternative Names

HIP90420 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD348731.

V992 Herculis has alternative name(s) :- , V992 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+17 3580.

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

Location of V992 Herculis

The location of the variable 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 V992 Herculis, the location is 18h 26m 56.98 and +17° 44` 02.5 .

Proper Motion of V992 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 -5.48 ± 0.65 milliarcseconds/year towards the north and 1.58 ± 1.07 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.

V992 Herculis 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 10.11 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) of V992 Herculis

V992 Herculis Colour and Temperature

V992 Herculis has a spectral type of K2. This means the star is a orange to red variable star. The star has a B-V Colour Index of 1.24 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,494 Kelvin.

V992 Herculis Radius

Radius has been calculated as being 3.90 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,717,017.51.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 4.03. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V992 Herculis Apparent and Absolute Magnitudes

V992 Herculis has an apparent magnitude of 8.85 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 2.98 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.91. 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 V992 Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.71 which gave the calculated distance to V992 Herculis as 486.09 light years away from Earth or 149.03 parsecs. It would take a spaceship travelling at the speed of light, 486.09 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 6.50 which put V992 Herculis at a distance of 501.79 light years or 153.85 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 31,733,619.32 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 7,301.00 Parsecs or 23,813.19 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V992 Herculis

The star is a pulsating Semi-Regular Star w variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. V992 Herculis brightness ranges from a magnitude of 9.099 to a magnitude of 8.926 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.

Hide Explanations
Show GridLines

Additional V992 Herculis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV992 Herculis
Alternative NamesHD 348731, HIP 90420, BD+17 3580, V992 Her
Spectral TypeK2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 2.98 / 2.91
Visual / Apparent Magnitude8.85
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 26m 56.98
Declination (Dec.)+17° 44` 02.5
Galactic Latitude13.26 degrees
Galactic Longitude46.28 degrees
1997 Distance from Earth6.71 Parallax (milliarcseconds)
 486.09 Light Years
 149.03 Parsecs
2007 Distance from Earth6.50 Parallax (milliarcseconds)
 501.79 Light Years
 153.85 Parsecs
 31,733,619.32 Astronomical Units
Galacto-Centric Distance23,813.19 Light Years / 7,301.00 Parsecs
Proper Motion Dec.-5.48 ± 0.65 milliarcseconds/year
Proper Motion RA.1.58 ± 1.07 milliarcseconds/year
B-V Index1.24
Stellar Luminosity (Lsun)10.11

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.133
Variable Magnitude Range (Brighter - Dimmer)8.926 - 9.099

Estimated Calculated Facts

Radius (x the Sun)4.03
Effective Temperature4,494 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine