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HD 212168

HD 212168 Facts

HD 212168's Alternative Names

HIP110712 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD212168.

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

Location of HD 212168

The location of the subgiant 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 212168, the location is 22h 25m 51.03 and -75° 00` 56.6 .

Radial Velocity and Proper Motion of HD 212168

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 12.25 ± 0.38 milliarcseconds/year towards the north and 57.79 ± 0.50 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 15.00 km/s with an error of about 0.17 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 212168 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 1.70 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, Age) of HD 212168

HD 212168 Colour and Temperature

HD 212168 has a spectral type of G3IV. This means the star is a yellow subgiant star. The star has a B-V Colour Index of 0.59 which means the star's temperature is about 5,931 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

HD 212168 Radius

Radius has been calculated as being 1.22 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 845,453.39.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.01 with an error value of 0.03 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 7.50 Billion years old but could be between 6.10 and 9.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 212168 Apparent and Absolute Magnitudes

HD 212168 has an apparent magnitude of 6.12 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 4.31 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 212168

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 43.39 which gave the calculated distance to HD 212168 as 75.17 light years away from Earth or 23.05 parsecs. If you want that in miles, it is 50,410,252,002.



The star's Galacto-Centric Distance is 7,387.00 Parsecs or 24,093.69 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to HD 212168

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)
Walking412,602,563,000.48
Car120420,085,433.35
Airbus A38073668,492,190.22
Speed of Sound (Mach 1)767.26965,700,884.57
Concorde (Mach 2)1,534.5432,850,399.47
New Horizons Probe33,0001,527,583.39
Speed of Light670,616,629.0075.17

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 212168 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 212168
Alternative NamesHD 212168, HIP 110712
Spectral TypeG3IV
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeSubgiant Star
ColourYellow
GalaxyMilky Way
ConstellationOctans
Age7.50 Billion Years Old
Age Range6.10 - 9.30 Billion Years Old
Absolute Magnitude 4.31
Visual / Apparent Magnitude6.12
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 25m 51.03
Declination (Dec.)-75° 00` 56.6
Galactic Latitude-38.73 degrees
Galactic Longitude314.27 degrees
Distance from Earth43.39 Parallax (milliarcseconds)
 75.17 Light Years
 23.05 Parsecs
 4,754,370.66 Astronomical Units
Galacto-Centric Distance24,093.69 Light Years / 7,387.00 Parsecs
Proper Motion Dec.12.25 ± 0.38 milliarcseconds/year
Proper Motion RA.57.79 ± 0.50 milliarcseconds/year
B-V Index0.59
Radial Velocity15.00 ± 0.17 km/s
Iron Abundance-0.01 ± 0.03 Fe/H
Eccentricity0.10
Semi-Major Axis7837.00
Stellar Luminosity (Lsun)1.70
Associated / Clustered StarsHD 212168 B

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)1.22
Effective Temperature5,931 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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