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HIP 25306, HD243331

HIP 25306 Facts

HIP 25306's Alternative Names

HIP25306 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD243331.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+23 911.

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

Location of HIP 25306

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 object is compared to the celestial equator and is expressed in degrees. For HIP 25306, the location is 05h 24m 48.01 and +24° 06` 23.1 .

Proper Motion of HIP 25306

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 -33.68 ± 0.72 milliarcseconds/year towards the north and 7.71 ± 1.25 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 25306

HIP 25306 Colour and Temperature

HIP 25306 has a spectral type of K5. This means the star is a orange to red star. The star has a B-V Colour Index of 1.59 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,802 Kelvin.

HIP 25306 Radius

Radius has been calculated as being 13.33 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,275,843.12.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 23.93. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 25306 Apparent and Absolute Magnitudes

HIP 25306 has an apparent magnitude of 8.99 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 1.04 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.23. 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 25306

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.57 which gave the calculated distance to HIP 25306 as 1269.12 light years away from Earth or 389.11 parsecs. If you want that in miles, it is 13,408,321,468,679,545.90.

In 2007, Hipparcos data was revised with a new parallax of 1.43 which put HIP 25306 at a distance of 2280.86 light years or 699.30 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 144,239,973.93 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 25306

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 62,172,341,946,789.75 hours or 7,097,299,308.99 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 25306 then it would take 226,081,243,442.87 hours / 25,808,361.12 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 1269.12 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 25306 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 25306
Alternative NamesHD 243331, HIP 25306, BD+23 911
Spectral TypeK5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationTaurus
Absolute Magnitude 1.04 / -0.23
Visual / Apparent Magnitude8.99
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 24m 48.01
Declination (Dec.)+24° 06` 23.1
Galactic Latitude-6.52 degrees
Galactic Longitude181.57 degrees
1997 Distance from Earth2.57 Parallax (milliarcseconds)
 1269.12 Light Years
 389.11 Parsecs
2007 Distance from Earth1.43 Parallax (milliarcseconds)
 2280.86 Light Years
 699.30 Parsecs
 144,239,973.93 Astronomical Units
Proper Motion Dec.-33.68 ± 0.72 milliarcseconds/year
Proper Motion RA.7.71 ± 1.25 milliarcseconds/year
B-V Index1.59

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)23.93
Effective Temperature3,802 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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