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HD 142

HD 142 Facts

  • HD 142 is a subgiant star that can be located in the constellation of Phoenix. The description is based on the spectral class.
  • HD 142 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G1IV...) of the star, the star's colour is yellow .
  • 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 83.87 light years away from us. Distance

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 objects' alternative names can be found at Star Names .

Location of HD 142

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 142, the location is 00h 06m 18.66 and -49° 04` 30.3 .

Radial Velocity and Proper Motion of HD 142

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 -39.19 ± 0.24 milliarcseconds/year towards the north and 575.29 ± 0.37 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 6.00000 km/s with an error of about 0.53 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 of HD 142

HD 142 Colour and Temperature

Based on the star's spectral type of G1IV... , HD 142's colour and type is yellow subgiant star. The star has a B-V Colour Index of 0.5 which means the star's temperature is about 6,285 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

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.

HD 142 Radius

HD 142 estimated 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 1.4664153828432173409259988339. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HD 142 Mass

The HD 142's solar mass is 1.10 times that of our star, the Sun. 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.

HD 142 Metalicity

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.

HD 142 Estimated Age

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 39.00000 which gave the calculated distance to HD 142 as 83.63 light years away from Earth or 25.64 parsecs. If you want that in miles, it is about 491,629,439,959,345.30, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 38.89000 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.

Using the 2007 distance, the star is roughly 5,303,031.22 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 7,392.00 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*.

Travel Time to HD 142

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)
Walking414,061,154,168.56
Car120468,705,138.95
Airbus A38073676,419,316.13
Speed of Sound (Mach 1)767.26973,304,951.29
Concorde (Mach 2)1,534.5436,652,427.88
New Horizons Probe33,0001,704,382.32
Speed of Light670,616,629.0083.87

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 142 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 142
Alternative NamesHD 142, HIP 522, Gliese 4.2A
Spectral TypeG1IV...
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeSubgiant Star
ColourYellow
GalaxyMilky Way
ConstellationPhoenix
Age3.10 Billion Years Old
Age Range2.40 - 3.50 Billion Years Old
Metalicity0.0400
Absolute Magnitude 3.66 / 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-66.38611603 degrees
Galactic Longitude321.59040251 degrees
1997 Distance from Earth39.00000 Parallax (milliarcseconds)
 83.63 Light Years
 25.64 Parsecs
2007 Distance from Earth38.89000 Parallax (milliarcseconds)
 83.87 Light Years
 25.71 Parsecs
 5,303,031.22 Astronomical Units
Galacto-Centric Distance24,109.99 Light Years / 7,392.00 Parsecs
Proper Motion Dec.-39.19000 ± 0.24000 milliarcseconds/year
Proper Motion RA.575.29000 ± 0.37000 milliarcseconds/year
B-V Index0.5
Radial Velocity6.00000 ± 0.53 km/s
Iron Abundance0.0800 ± 0.01 Fe/H
Eccentricity0.27520
Semi-Major Axis6115.0000000
Stellar Luminosity (Lsun)3.0100000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count2

Estimated Calculated Facts


Radius (x the Sun)1.47
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 AxisPeriastron
HD 142 bConfirmed0.15349.7000.1720011.02327.000
HD 142 cConfirmed0.76005.0000.2120126.8250.000

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