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HD 195814

HD 195814 Facts

HD 195814's Alternative Names

HIP101558 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD195814.

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

Location of HD 195814

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 195814, the location is 20h 34m 55.46 and -38° 05` 23.5 .

Radial Velocity and Proper Motion of HD 195814

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 -11.95 ± 0.28 milliarcseconds/year towards the north and 18.68 ± 0.49 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 22.00 km/s with an error of about 0.40 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 195814 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 9.68 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 HD 195814

HD 195814 Colour and Temperature

HD 195814 has a spectral type of A5m.... This means the star is a blue - white star. The star has a B-V Colour Index of 0.26 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,999 Kelvin.

HD 195814 Radius

Radius has been calculated as being 2.18 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,518,074.43.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 2.17. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 195814 Apparent and Absolute Magnitudes

HD 195814 has an apparent magnitude of 6.45 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 2.32 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.33. 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 195814

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.94 which gave the calculated distance to HD 195814 as 218.32 light years away from Earth or 66.93 parsecs. It would take a spaceship travelling at the speed of light, 218.32 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 14.98 which put HD 195814 at a distance of 217.73 light years or 66.76 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 13,770,142.51 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.

The star's Galacto-Centric Distance is 7,346.00 Parsecs or 23,959.96 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 195814 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 195814
Alternative NamesHD 195814, HIP 101558
Spectral TypeA5m...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationMicroscopium
Absolute Magnitude 2.32 / 2.33
Visual / Apparent Magnitude6.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 34m 55.46
Declination (Dec.)-38° 05` 23.5
Galactic Latitude-35.94 degrees
Galactic Longitude3.94 degrees
1997 Distance from Earth14.94 Parallax (milliarcseconds)
 218.32 Light Years
 66.93 Parsecs
2007 Distance from Earth14.98 Parallax (milliarcseconds)
 217.73 Light Years
 66.76 Parsecs
 13,770,142.51 Astronomical Units
Galacto-Centric Distance23,959.96 Light Years / 7,346.00 Parsecs
Proper Motion Dec.-11.95 ± 0.28 milliarcseconds/year
Proper Motion RA.18.68 ± 0.49 milliarcseconds/year
B-V Index0.26
Radial Velocity22.00 ± 0.40 km/s
Eccentricity0.18
Semi-Major Axis8366.00
Stellar Luminosity (Lsun)9.68

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)2.17
Effective Temperature6,999 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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