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MZ Puppis, HD66888, HIP39487

MZ Puppis is a red pulsating 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.

HIP39487 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD66888. The Id of the star in the Gould Star Catalogue is 250. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

MZ Puppis has alternative name(s), MZ Pup.

Location of MZ 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 MZ Puppis, the location is 08h 04m 16.19 and -32d 40` 29.4 .

Proper Motion of MZ 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 6.60 ± 0.20 miliarcseconds/year towards the north and -4.80 ± 0.24 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 35.90000 km/s with an error of about 0.80 km/s .

Physical Properties (Colour, Temperature, Radius) of MZ Puppis

MZ Puppis has a spectral type of M2II. This means the star is a red star. The star is 7637.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24909.0945812800000000s. The star has a B-V Colour Index of 1.88 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 2,591 Kelvin.

MZ Puppis Radius has been calculated as being 296.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 206,296,836.81.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 264.24. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

MZ Puppis Apparent and Absolute Magnitudes

MZ Puppis has an apparent magnitude of 5.25 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 -4.03 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.78. 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 MZ Puppis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.39 which gave the calculated distance to MZ Puppis as 2346.50 light years away from Earth or 719.42 parsecs. It would take a spaceship travelling at the speed of light, 2346.50 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 1.56 which put MZ Puppis at a distance of 2090.79 light years or 641.03 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 7,637.00 Parsecs or 24,909.09 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of MZ Puppis

The star is a pulsating Slow 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. MZ Puppis brightness ranges from a magnitude of 5.352 to a magnitude of 5.144 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

MZ Puppis Facts

Alternative Names

Traditional/Proper NameMZ Puppis
Short NameMZ Pup
Hipparcos Library I.D.39487
Gould I.D.250
Henry Draper Designation66888

Visual Facts

Star Type star
Absolute Magnitude-4.03 / -3.78
Visual / Apparent Magnitude5.25
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 04m 16.19
Declination (Dec.)-32d 40` 29.4
Galactic Latitude-0.69 degrees
Galactic Longitude249.83 degrees
1997 Distance from Earth1.39 Parallax (milliarcseconds)
 2346.50 Light Years
 719.42 Parsecs
2007 Revised Distance from Earth1.56 Parallax (milliarcseconds)
 2090.79 Light Years
 641.03 Parsecs
Galacto-Centric Distance24,909.09 Light Years / 7,637.00 Parsecs
Proper Motion Dec.6.60 ± 0.20 milliarcseconds/year
Proper Motion RA.-4.80 ± 0.24 milliarcseconds/year
B-V Index1.88
Radial Velocity35.90 ± 0.80 km/s
Spectral TypeM2II
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Irregular probably
Mean Variability Period in Days0.166
Variable Magnitude Range (Brighter - Dimmer)5.144 - 5.352

Estimated Facts

Calculated Effective Temperature2,591 Kelvin

Sources and Links

SIMBAD SourceLink

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