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HIP 76645, HD139261

HIP 76645 Facts

HIP 76645's Alternative Names

HIP76645 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD139261.

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

Location of HIP 76645

The location of the giant 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 76645, the location is 15h 39m 06.40 and -48° 36` 49.5 .

Proper Motion of HIP 76645

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 -5.34 ± 0.59 milliarcseconds/year towards the north and -3.50 ± 0.98 milliarcseconds/year east if we saw them in the horizon. . 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 (Colour, Temperature) of HIP 76645

HIP 76645 Colour and Temperature

HIP 76645 has a spectral type of M0/M1III. This means the star is a red giant star. The star has a B-V Colour Index of 1.81 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 2,875 Kelvin.

HIP 76645 Radius

Radius has been calculated as being 32.93 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 22,914,441.95.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 40.33. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 76645 Apparent and Absolute Magnitudes

HIP 76645 has an apparent magnitude of 7.83 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 0.29 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.15. 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 76645

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.10 which gave the calculated distance to HIP 76645 as 1052.14 light years away from Earth or 322.58 parsecs. If you want that in miles, it is 7,548,801,627,958,792.60.

In 2007, Hipparcos data was revised with a new parallax of 2.54 which put HIP 76645 at a distance of 1284.11 light years or 393.70 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 81,205,888.37 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.

Time to Travel to HIP 76645

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 51,542,807,501,178.27 hours or 5,883,882,134.84 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to HIP 76645 then it would take 187,428,390,913.38 hours / 21,395,935.04 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 1052.14 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

HIP 76645 brightness ranges from a magnitude of 7.895 to a magnitude of 7.820 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 76645 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 76645
Alternative NamesHD 139261, HIP 76645
Spectral TypeM0/M1III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationNorma
Absolute Magnitude 0.29 / -0.15
Visual / Apparent Magnitude7.83
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 39m 06.40
Declination (Dec.)-48° 36` 49.5
Galactic Latitude5.49 degrees
Galactic Longitude329.27 degrees
1997 Distance from Earth3.10 Parallax (milliarcseconds)
 1052.14 Light Years
 322.58 Parsecs
2007 Distance from Earth2.54 Parallax (milliarcseconds)
 1284.11 Light Years
 393.70 Parsecs
 81,205,888.37 Astronomical Units
Proper Motion Dec.-5.34 ± 0.59 milliarcseconds/year
Proper Motion RA.-3.50 ± 0.98 milliarcseconds/year
B-V Index1.81

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.050
Variable Magnitude Range (Brighter - Dimmer)7.820 - 7.895

Estimated Calculated Facts


Radius (x the Sun)40.33
Effective Temperature2,875 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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