Universe Guide

HD 142139

HD 142139 Facts

  • HD 142139 is a main sequence star that can be located in the constellation of Triangulum Australe. The description is based on the spectral class.
  • HD 142139 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A3V) of the star, the star's colour is blue - white .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • The star is calculated at being about 215.29 light years away from us. Distance

HD 142139's Alternative Names

HIP78045 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD142139.

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

Location of HD 142139

The location of the main sequence 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 142139, the location is 15h 56m 05.96 and -60° 28` 56.3 .

Radial Velocity and Proper Motion of HD 142139

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 -74.63 ± 0.24 milliarcseconds/year towards the north and -38.60 ± 0.30 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 -16.70000 km/s with an error of about 2.70 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 142139

HD 142139 Colour and Temperature

Based on the star's spectral type of A3V , HD 142139's colour and type is blue - white main sequence star. The star has a B-V Colour Index of 0.08 which means the star's temperature is about 8,626 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 142139 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 18.71 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 142139 Radius

HD 142139 estimated radius has been calculated as being 1.95 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,354,417.72.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 rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HD 142139 Apparent and Absolute Magnitudes

HD 142139 has an apparent magnitude of 5.76 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 1.66 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 142139

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 15.15000 which gave the calculated distance to HD 142139 as 215.29 light years away from Earth or 66.01 parsecs. If you want that in miles, it is about 1,265,609,256,592,699.40, based on 1 Ly = 5,878,625,373,183.61 miles.

The star's Galacto-Centric Distance is 7,347.00 Parsecs or 23,963.22 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 142139

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)
Airbus A380736196,164,475.62
Speed of Sound (Mach 1)767.269188,170,060.38
Concorde (Mach 2)1,534.5494,084,907.57
New Horizons Probe33,0004,375,062.24
Speed of Light670,616,629.00215.29

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 142139 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHD 142139
Alternative NamesHD 142139, HIP 78045
Spectral TypeA3V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
ConstellationTriangulum Australe
Absolute Magnitude 1.66
Visual / Apparent Magnitude5.76
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 56m 05.96
Declination (Dec.)-60° 28` 56.3
Galactic Latitude-5.34250617 degrees
Galactic Longitude323.84492384 degrees
Distance from Earth15.15000 Parallax (milliarcseconds)
 215.29 Light Years
 66.01 Parsecs
 13,615,444.99 Astronomical Units
Galacto-Centric Distance23,963.22 Light Years / 7,347.00 Parsecs
Proper Motion Dec.-74.63000 ± 0.24000 milliarcseconds/year
Proper Motion RA.-38.60000 ± 0.30000 milliarcseconds/year
B-V Index0.08
Radial Velocity-16.70000 ± 2.70 km/s
Semi-Major Axis7701.0000000
Stellar Luminosity (Lsun) 18.7100000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)1.95
Effective Temperature8,626 Kelvin

Sources and Links

SIMBAD SourceLink

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Comments and Questions

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