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HIP 25203, HD34919

HIP 25203 is a red eruptive variable star that can be located in the constellation of Auriga. 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 25203's Alternative Names

HIP25203 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD34919.

HIP 25203 has alternative name(s) :- , V421 Aur.

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+50 1159.

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

Location of HIP 25203

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 25203, the location is 05h 23m 30.19 and +50° 13` 13.9 .

Proper Motion of HIP 25203

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 15.07 ± 0.48 miliarcseconds/year towards the north and -7.99 ± 0.97 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature) of HIP 25203

HIP 25203 has a spectral type of M0. This means the star is a red variable star. The star has a B-V Colour Index of 1.75 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,255 Kelvin.

HIP 25203 Radius has been calculated as being 18.96 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,190,963.47.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 27.28. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 25203 Apparent and Absolute Magnitudes

HIP 25203 has an apparent magnitude of 7.80 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 0.95 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.16. 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 25203

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.27 which gave the calculated distance to HIP 25203 as 763.85 light years away from Earth or 234.19 parsecs. It would take a spaceship travelling at the speed of light, 763.85 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 2.96 which put HIP 25203 at a distance of 1101.90 light years or 337.84 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.

Variable Type of HIP 25203

The star is a eruptive Irregular variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. HIP 25203 brightness ranges from a magnitude of 8.006 to a magnitude of 7.837 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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HIP 25203 Facts

Visual Facts


 HIP 25203
Alternative NamesHD 34919, HIP 25203, BD+50 1159, V421 Aur
Spectral TypeM0
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
ConstellationAuriga
Absolute Magnitude0.95 / 0.16
Visual / Apparent Magnitude7.80
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 23m 30.19
Declination (Dec.)+50° 13` 13.9
Galactic Latitude7.89 degrees
Galactic Longitude159.73 degrees
1997 Distance from Earth4.27 Parallax (milliarcseconds)
 763.85 Light Years
 234.19 Parsecs
2007 Distance from Earth2.96 Parallax (milliarcseconds)
 1101.90 Light Years
 337.84 Parsecs
Proper Motion Dec.15.07 ± 0.48 milliarcseconds/year
Proper Motion RA.-7.99 ± 0.97 milliarcseconds/year
B-V Index1.75

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.117
Variable Magnitude Range (Brighter - Dimmer)7.837 - 8.006

Estimated Facts


Calculated Effective Temperature3,255 Kelvin

Sources and Links


SIMBAD SourceLink

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