Universe Guide


HD 142022, HIP79242

HD 142022 is a orange to red main sequence dwarf star that can be located in the constellation of Octans. HD 142022 is the brightest star in Octans based on the Hipparcos 2007 apparent magnitude. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 12.30 Billion of Years but could be as young as 8.00 to 15.70 according to Hipparcos.

HIP79242 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD142022. The Gliese ID of the star is Gliese GL606.1A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names. HD 142022 has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of HD 142022

The location of the star in the galaxy 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 HD 142022, the location is 16h 10m 16.98 and -84d13`53.5 .

Proper Motion of HD 142022

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 -31.77 ± 0.50 miliarcseconds/year towards the north and -336.32 ± 0.57 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of HD 142022

HD 142022 has a spectral type of K0V. This means the star is a orange to red main sequence dwarf star. The star is 7381.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24074.1164206400000000s. The star has a B-V Colour Index of 0.79 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,311 Kelvin.

HD 142022 Radius has been calculated as being 1.14 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 792,477.29.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.09. 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 0.18 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 12.30 Billion years old but could be between 8.00 and 15.70 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old. The reported age is older than the widely recognised age of the Universe so a little scepticism about the age is warranted.

HD 142022 Apparent and Absolute Magnitudes

HD 142022 has an apparent magnitude of 7.70 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 4.93 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.02. 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 142022

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 27.88 which gave the calculated distance to HD 142022 as 116.99 light years away from Earth or 35.87 parsecs. It would take a spaceship travelling at the speed of light, 116.99 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 29.13 which put HD 142022 at a distance of 111.97 light years or 34.33 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.

The star's Galacto-Centric Distance is 7,381.00 Parsecs or 24,074.12 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.

HD 142022 Facts

Alternative Names

Traditional/Proper NameHD 142022
Hipparcos Library I.D.79242
Gliese ID606.1A
Henry Draper Designation142022

Visual Facts

Star Typemain sequence dwarf star
Age12.30 Billion Years Old
Age Range8.00 - 15.70 Billion Years Old
Absolute Magnitude4.93 / 5.02
Visual / Apparent Magnitude7.70
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)16h 10m 16.98
Declination (Dec.)-84d13`53.5
Galactic Latitude-23.32 degrees
Galactic Longitude307.72 degrees
1997 Distance from Earth27.88 Parallax (milliarcseconds)
 116.99 Light Years
 35.87 Parsecs
2007 Revised Distance from Earth29.13 Parallax (milliarcseconds)
 111.97 Light Years
 34.33 Parsecs
Galacto-Centric Distance24,074.12 Light Years / 7,381.00 Parsecs
Proper Motion Dec.-31.77 ± 0.50 milliarcseconds/year
Proper Motion RA.-336.32 ± 0.57 milliarcseconds/year
B-V Index0.79
Radial Velocity-9.60 ± 0.40 km/s
Iron Abundance0.18 ± 0.03 Fe/H
Spectral TypeK0V
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,311 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
142022-83 593.4A7.70000-329.00000-10.00000K0Orange

List of Extrasolar Planets orbiting HD 142022

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
Hd 142022 A BConfirmed291928.0000.5320053.03170.00010.000

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