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HD 142, HIP522

HD 142 is a white to yellow subgiant star that can be located in the constellation of Phoenix. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 3.10 Billion of Years but could be as young as 2.40 to 3.50 according to Hipparcos. HD 142 has at least 2 Extrasolar Planets believed to be in orbit around the star.

HD 142's Alternative Names

HIP522 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD142. The Gliese ID of the star is GL 4.2A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

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

Location of HD 142

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 star is compared to the celestial equator and is expressed in degrees. For HD 142, the location is 00h 06m 18.66 and -49° 04` 30.3 .

Proper Motion of HD 142

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 -39.19 ± 0.24 miliarcseconds/year towards the north and 575.29 ± 0.37 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 6.00000 km/s with an error of about 0.53 km/s .

HD 142 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 3.01 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, Metallicity, Age, Mass) of HD 142

HD 142 has a spectral type of G1IV.... This means the star is a white to yellow subgiant star. The star is 7,392.00 Parsecs from the Galactic Centre or terms of Light Years is 24,109.99 s. The star has a B-V Colour Index of 0.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,285 Kelvin.

HD 142 Radius has been calculated as being 1.46 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,015,643.59.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 1.47. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 1.10 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.040000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The stars age according to Hipparcos data files put the star at an age of about 3.10 Billion years old but could be between 2.40 and 3.50 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 142 Apparent and Absolute Magnitudes

HD 142 has an apparent magnitude of 5.70 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 3.66 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.65. 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 142

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 39.00 which gave the calculated distance to HD 142 as 83.63 light years away from Earth or 25.64 parsecs. It would take a spaceship travelling at the speed of light, 83.63 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 38.89 which put HD 142 at a distance of 83.87 light years or 25.71 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 7,392.00 Parsecs or 24,109.99 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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HD 142 Facts

Visual Facts


Primary / Proper / Traditional NameHD 142
Alternative NamesHD 142, HIP 522, Gliese 4.2A
Spectral TypeG1IV...
Multiple Star SystemYes
Star TypeSubgiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationPhoenix
Age3.10 Billion Years Old
Age Range2.40 - 3.50 Billion Years Old
Metalicity0.0400
Absolute Magnitude3.66 / 3.65
Visual / Apparent Magnitude5.70
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)00h 06m 18.66
Declination (Dec.)-49° 04` 30.3
Galactic Latitude-66.39 degrees
Galactic Longitude321.59 degrees
1997 Distance from Earth39.00 Parallax (milliarcseconds)
 83.63 Light Years
 25.64 Parsecs
2007 Distance from Earth38.89 Parallax (milliarcseconds)
 83.87 Light Years
 25.71 Parsecs
Galacto-Centric Distance24,109.99 Light Years / 7,392.00 Parsecs
Proper Motion Dec.-39.19 ± 0.24 milliarcseconds/year
Proper Motion RA.575.29 ± 0.37 milliarcseconds/year
B-V Index0.50
Radial Velocity6.00 ± 0.53 km/s
Iron Abundance0.08 ± 0.01 Fe/H
Eccentricity0.28
Semi-Major Axis6115.00
Stellar Luminosity (Lsun)3.01

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count2

Estimated Facts


Calculated Effective Temperature6,285 Kelvin
Mass Compared to the Sun1.10

Sources and Links


SIMBAD SourceLink

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
142-4914337.2A5.80000585.00000-37.00000G0Yellow
B11.50000585.00000-37.000001900

List of Extrasolar Planets orbiting HD 142


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HD 142 bConfirmed0.15349.7000.1720011.02327.0002001.000
HD 142 cConfirmed0.76005.0000.2120126.8250.0002012.000

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