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HD 194612

HD 194612 Facts

HD 194612's Alternative Names

HIP101843 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD194612.

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

Location of HD 194612

The location of the giant 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 194612, the location is 20h 38m 18.60 and -81° 17` 20.3 .

Radial Velocity and Proper Motion of HD 194612

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 -38.40 ± 0.18 milliarcseconds/year towards the north and 1.42 ± 0.25 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 0.30 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.

Physical Properties (Colour, Temperature) of HD 194612

HD 194612 Colour and Temperature

HD 194612 has a spectral type of K5III. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.69 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,502 Kelvin.

HD 194612 Radius

Radius has been calculated as being 32.83 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 22,843,415.78.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 32.98. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 194612 Apparent and Absolute Magnitudes

HD 194612 has an apparent magnitude of 5.89 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 -0.56 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.57. 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 194612

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.13 which gave the calculated distance to HD 194612 as 635.80 light years away from Earth or 194.93 parsecs. It would take a spaceship travelling at the speed of light, 635.80 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 5.11 which put HD 194612 at a distance of 638.28 light years or 195.69 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 40,363,678.68 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 7,289.00 Parsecs or 23,774.05 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. HD 194612 brightness ranges from a magnitude of 6.014 to a magnitude of 5.977 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 HD 194612 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 194612
Alternative NamesHD 194612, HIP 101843
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationOctans
Absolute Magnitude -0.56 / -0.57
Visual / Apparent Magnitude5.89
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 38m 18.60
Declination (Dec.)-81° 17` 20.3
Galactic Latitude-30.75 degrees
Galactic Longitude311.99 degrees
1997 Distance from Earth5.13 Parallax (milliarcseconds)
 635.80 Light Years
 194.93 Parsecs
2007 Distance from Earth5.11 Parallax (milliarcseconds)
 638.28 Light Years
 195.69 Parsecs
 40,363,678.68 Astronomical Units
Galacto-Centric Distance23,774.05 Light Years / 7,289.00 Parsecs
Proper Motion Dec.-38.40 ± 0.18 milliarcseconds/year
Proper Motion RA.1.42 ± 0.25 milliarcseconds/year
B-V Index1.69
Radial Velocity0.30 ± 0.40 km/s
Eccentricity0.12
Semi-Major Axis6451.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.025
Variable Magnitude Range (Brighter - Dimmer)5.977 - 6.014

Estimated Calculated Facts


Radius (x the Sun)32.98
Effective Temperature3,502 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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