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HIP 6634, HD8696

HIP 6634 is a orange to red giant star that can be located in the constellation of Phoenix. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

HIP 6634's Alternative Names

HIP6634 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD8696.

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

Location of HIP 6634

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 star is compared to the celestial equator and is expressed in degrees. For HIP 6634, the location is 01h 25m 07.40 and -39° 22` 41.3 .

Proper Motion of HIP 6634

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 -69.39 ± 0.39 miliarcseconds/year towards the north and 76.62 ± 0.62 miliarcseconds/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.

HIP 6634 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 16.09 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 6634

HIP 6634 has a spectral type of K1III. This means the star is a orange to red giant star. The star is 7,398.00 Parsecs from the Galactic Centre or terms of Light Years is 24,129.56 s. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

HIP 6634 Radius has been calculated as being 4.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,924,549.77.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 4.85. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 6634 Apparent and Absolute Magnitudes

HIP 6634 has an apparent magnitude of 7.55 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 2.49 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.18. 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 6634

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.73 which gave the calculated distance to HIP 6634 as 335.21 light years away from Earth or 102.77 parsecs. It would take a spaceship travelling at the speed of light, 335.21 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 8.44 which put HIP 6634 at a distance of 386.45 light years or 118.48 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.

The star's Galacto-Centric Distance is 7,398.00 Parsecs or 24,129.56 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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HIP 6634 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 6634
Alternative NamesHD 8696, HIP 6634
Spectral TypeK1III
Multiple Star SystemYes
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationPhoenix
Absolute Magnitude2.49 / 2.18
Visual / Apparent Magnitude7.55
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 25m 07.40
Declination (Dec.)-39° 22` 41.3
Galactic Latitude-75.89 degrees
Galactic Longitude275.27 degrees
1997 Distance from Earth9.73 Parallax (milliarcseconds)
 335.21 Light Years
 102.77 Parsecs
2007 Distance from Earth8.44 Parallax (milliarcseconds)
 386.45 Light Years
 118.48 Parsecs
Galacto-Centric Distance24,129.56 Light Years / 7,398.00 Parsecs
Proper Motion Dec.-69.39 ± 0.39 milliarcseconds/year
Proper Motion RA.76.62 ± 0.62 milliarcseconds/year
B-V Index1.00
Stellar Luminosity (Lsun)16.09

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,849 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
8696-40 336.2A7.8000075.00000-77.00000G5Yellow
B11.600001925

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