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HIP 76556, HD140023

HIP 76556 Facts

HIP 76556's Alternative Names

HIP76556 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD140023.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+61 1523.

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

Location of HIP 76556

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 object is compared to the celestial equator and is expressed in degrees. For HIP 76556, the location is 15h 38m 05.89 and +61° 25` 13.3 .

Radial Velocity and Proper Motion of HIP 76556

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 26.68 ± 0.55 miliarcseconds/year towards the north and -154.35 ± 0.60 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 the Sun is -51.00 km/s with an error of about 0.40 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.

HIP 76556 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 3.13 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 HIP 76556

HIP 76556 has a spectral type of G0. This means the star is a white to yellow star. The star is 7,406.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,155.66 s. The star has a B-V Colour Index of 0.57 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,945 Kelvin.

HIP 76556 Radius has been calculated as being 1.50 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,044,831.87.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 1.63. 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 -0.08 with an error value of 0.05 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 3.90 Billion years old but could be between 3.40 and 4.10 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HIP 76556 Apparent and Absolute Magnitudes

HIP 76556 has an apparent magnitude of 8.12 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 3.84 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.66. 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 HIP 76556

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.91 which gave the calculated distance to HIP 76556 as 234.48 light years away from Earth or 71.89 parsecs. It would take a spaceship travelling at the speed of light, 234.48 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 12.83 which put HIP 76556 at a distance of 254.22 light years or 77.94 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 16,076,166.98 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 7,406.00 Parsecs or 24,155.66 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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Additional HIP 76556 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 76556
Alternative NamesHD 140023, HIP 76556, BD+61 1523
Spectral TypeG0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourWhite to Yellow
GalaxyMilky Way
ConstellationDraco
Age3.90 Billion Years Old
Age Range3.40 - 4.10 Billion Years Old
Absolute Magnitude 3.84 / 3.66
Visual / Apparent Magnitude8.12
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 38m 05.89
Declination (Dec.)+61° 25` 13.3
Galactic Latitude45.93 degrees
Galactic Longitude95.72 degrees
1997 Distance from Earth13.91 Parallax (milliarcseconds)
 234.48 Light Years
 71.89 Parsecs
2007 Distance from Earth12.83 Parallax (milliarcseconds)
 254.22 Light Years
 77.94 Parsecs
 16,076,166.98 Astronomical Units
Galacto-Centric Distance24,155.66 Light Years / 7,406.00 Parsecs
Proper Motion Dec.26.68 ± 0.55 milliarcseconds/year
Proper Motion RA.-154.35 ± 0.60 milliarcseconds/year
B-V Index0.57
Radial Velocity-51.00 ± 0.40 km/s
Iron Abundance-0.08 ± 0.05 Fe/H
Eccentricity0.46
Semi-Major Axis4530.00
Stellar Luminosity (Lsun)3.13

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)1.63
Effective Temperature5,945 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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