Universe Guide

HIP 76803, HD139733

HIP 76803 Facts

HIP 76803's Alternative Names

HIP76803 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD139733.

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

Location of HIP 76803

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 HIP 76803, the location is 15h 40m 55.20 and -33° 08` 45.0 .

Proper Motion of HIP 76803

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 -11.63 ± 0.62 milliarcseconds/year towards the north and -6.53 ± 1.14 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 76803

HIP 76803 Colour and Temperature

HIP 76803 has a spectral type of K0III/IV. This means the star is a orange to red subgiant star. The star has a B-V Colour Index of 1.31 which means the star's temperature is about 4,306 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

HIP 76803 Radius

Radius has been calculated as being 10.88 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,572,347.76.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 35.54. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 76803 Apparent and Absolute Magnitudes

HIP 76803 has an apparent magnitude of 8.31 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 0.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.63. 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 76803

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.35 which gave the calculated distance to HIP 76803 as 973.62 light years away from Earth or 298.51 parsecs. If you want that in miles, it is 652,925,762,327.

In 2007, Hipparcos data was revised with a new parallax of 1.03 which put HIP 76803 at a distance of 3166.63 light years or 970.87 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 200,254,917.05 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.

Travel Time to HIP 76803

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 A3807362,885,318,934.63
Speed of Sound (Mach 1)767.2692,767,731,702.82
Concorde (Mach 2)1,534.541,383,864,047.79
New Horizons Probe33,00064,351,355.63
Speed of Light670,616,629.003,166.63

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 76803 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHIP 76803
Alternative NamesHD 139733, HIP 76803
Spectral TypeK0III/IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 0.94 / -1.63
Visual / Apparent Magnitude8.31
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 40m 55.20
Declination (Dec.) -33° 08` 45.0
Galactic Latitude17.53 degrees
Galactic Longitude339.21 degrees
1997 Distance from Earth3.35 Parallax (milliarcseconds)
 973.62 Light Years
 298.51 Parsecs
2007 Distance from Earth1.03 Parallax (milliarcseconds)
 3166.63 Light Years
 970.87 Parsecs
 200,254,917.05 Astronomical Units
Proper Motion Dec.-11.63 ± 0.62 milliarcseconds/year
Proper Motion RA.-6.53 ± 1.14 milliarcseconds/year
B-V Index1.31

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)35.54
Effective Temperature4,306 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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