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HIP 6641, HD9123

Primary Facts on HIP 6641

  • HIP 6641's star type is giant star that can be located in the constellation of Hydrus. The description is based on the spectral class.
  • HIP 6641 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G8/K0III) of the star, the star's colour is white to yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 1387.93 light years away from us.

HIP 6641's Alternative Names

HIP6641 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD9123.

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

Location of HIP 6641

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 6641, the location is 01h 25m 11.82 and -79° 53` 45.8 .

Proper Motion of HIP 6641

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 -0.46 ± 0.52 miliarcseconds/year towards the north and 25.61 ± 0.58 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.

Physical Properties (Colour, Temperature) of HIP 6641

HIP 6641 has a spectral type of G8/K0III. This means the star is a white to yellow giant star. The star has a B-V Colour Index of 0.99 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,868 Kelvin.

HIP 6641 Radius has been calculated as being 9.25 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,436,936.57.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 10.82. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 6641 Apparent and Absolute Magnitudes

HIP 6641 has an apparent magnitude of 8.56 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 0.76 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.42. 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 6641

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.75 which gave the calculated distance to HIP 6641 as 1186.05 light years away from Earth or 363.64 parsecs. It would take a spaceship travelling at the speed of light, 1186.05 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 2.35 which put HIP 6641 at a distance of 1387.93 light years or 425.53 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 87,771,251.40 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.

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 6641 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 6641
Alternative NamesHD 9123, HIP 6641
Spectral TypeG8/K0III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationHydrus
Absolute Magnitude 0.76 / 0.42
Visual / Apparent Magnitude8.56
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 25m 11.82
Declination (Dec.)-79° 53` 45.8
Galactic Latitude-37.11 degrees
Galactic Longitude301.08 degrees
1997 Distance from Earth2.75 Parallax (milliarcseconds)
 1186.05 Light Years
 363.64 Parsecs
2007 Distance from Earth2.35 Parallax (milliarcseconds)
 1387.93 Light Years
 425.53 Parsecs
 87,771,251.40 Astronomical Units
Proper Motion Dec.-0.46 ± 0.52 milliarcseconds/year
Proper Motion RA.25.61 ± 0.58 milliarcseconds/year
B-V Index0.99

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,868 Kelvin

Sources and Links


SIMBAD SourceLink

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