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HIP 76472, HD138995

HIP 76472 Facts

HIP 76472's Alternative Names

HIP76472 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD138995.

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

Location of HIP 76472

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 HIP 76472, the location is 15h 37m 04.67 and -40° 09` 21.9 .

Radial Velocity and Proper Motion of HIP 76472

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 -26.75 ± 0.89 miliarcseconds/year towards the north and -21.46 ± 1.56 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 1.80 km/s with an error of about 3.40 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 76472 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 2.14 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) of HIP 76472

HIP 76472 has a spectral type of G5V. This means the star is a white to yellow main sequence star. The star is 7,302.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,816.45 s. The star has a B-V Colour Index of 0.73 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,475 Kelvin.

HIP 76472 Radius has been calculated as being 2.41 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,677,213.93.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 1.59. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 76472 Apparent and Absolute Magnitudes

HIP 76472 has an apparent magnitude of 9.39 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 3.17 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.07. 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 76472

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.70 which gave the calculated distance to HIP 76472 as 572.22 light years away from Earth or 175.44 parsecs. It would take a spaceship travelling at the speed of light, 572.22 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 8.61 which put HIP 76472 at a distance of 378.82 light years or 116.14 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 23,955,427.67 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 7,302.00 Parsecs or 23,816.45 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. HIP 76472 brightness ranges from a magnitude of 9.657 to a magnitude of 9.469 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 days (variability).

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 76472 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHIP 76472
Alternative NamesHD 138995, HIP 76472
Spectral TypeG5V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
ColourWhite to Yellow
GalaxyMilky Way
Absolute Magnitude 3.17 / 4.07
Visual / Apparent Magnitude9.39
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 37m 04.67
Declination (Dec.)-40° 09` 21.9
Galactic Latitude12.48 degrees
Galactic Longitude334.11 degrees
1997 Distance from Earth5.70 Parallax (milliarcseconds)
 572.22 Light Years
 175.44 Parsecs
2007 Distance from Earth8.61 Parallax (milliarcseconds)
 378.82 Light Years
 116.14 Parsecs
 23,955,427.67 Astronomical Units
Galacto-Centric Distance23,816.45 Light Years / 7,302.00 Parsecs
Proper Motion Dec.-26.75 ± 0.89 milliarcseconds/year
Proper Motion RA.-21.46 ± 1.56 milliarcseconds/year
B-V Index0.73
Radial Velocity1.80 ± 3.40 km/s
Semi-Major Axis7073.00
Stellar Luminosity (Lsun)2.14

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.167
Variable Magnitude Range (Brighter - Dimmer)9.469 - 9.657

Estimated Calculated Facts

Radius (x the Sun)1.59
Effective Temperature5,475 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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