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V438 Puppis, HD71302, HIP41250

V438 Puppis is a blue eclipsing binary system main sequence dwarf star that can be located in the constellation of Puppis. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

V438 Puppis's Alternative Names

HIP41250 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD71302.

V438 Puppis has alternative name(s) :- , V438 Pup.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 307 G. Puppis. There are no stars with a Gould designation in Ursa Major for example.

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

Location of V438 Puppis

The location of the star in the galaxy 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 V438 Puppis, the location is 08h 24m 57.22 and -42° 46` 11.5 .

Proper Motion of V438 Puppis

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 6.11 ± 0.36 miliarcseconds/year towards the north and -11.02 ± 0.48 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 23.00000 km/s with an error of about 5.00 km/s .

Physical Properties (Colour, Temperature) of V438 Puppis

V438 Puppis has a spectral type of B3V. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of -0.15 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 13,674 Kelvin.

V438 Puppis Radius has been calculated as being 10.12 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,041,013.29.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 5.85. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V438 Puppis Apparent and Absolute Magnitudes

V438 Puppis has an apparent magnitude of 5.97 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 -3.92 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.73. 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 V438 Puppis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.05 which gave the calculated distance to V438 Puppis as 3106.32 light years away from Earth or 952.38 parsecs. It would take a spaceship travelling at the speed of light, 3106.32 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 1.82 which put V438 Puppis at a distance of 1792.11 light years or 549.45 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 V438 Puppis

The star is a eclipsing binary system Beta Persei (Algol) 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. V438 Puppis brightness ranges from a magnitude of 6.066 to a magnitude of 5.898 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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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V438 Puppis Facts

Visual Facts

Alternative NamesHD 71302, HIP 41250, 307 G. Puppis, V438 Pup
Star Type main sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude-3.92 / -2.73
Visual / Apparent Magnitude5.97
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 24m 57.22
Declination (Dec.)-42° 46` 11.5
Galactic Latitude-2.89 degrees
Galactic Longitude260.50 degrees
1997 Distance from Earth1.05 Parallax (milliarcseconds)
 3106.32 Light Years
 952.38 Parsecs
2007 Revised Distance from Earth1.82 Parallax (milliarcseconds)
 1792.11 Light Years
 549.45 Parsecs
Proper Motion Dec.6.11 ± 0.36 milliarcseconds/year
Proper Motion RA.-11.02 ± 0.48 milliarcseconds/year
B-V Index-0.15
Radial Velocity23.00 ± 5.00 km/s
Spectral TypeB3V
Colour(B) blue

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeBeta Persei (Algol)
Mean Variability Period in Days0.272
Variable Magnitude Range (Brighter - Dimmer)5.898 - 6.066

Estimated Facts

Calculated Effective Temperature13,674 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
71302-42 4219.2A6.80000-7.000009.00000B5Blue/White

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