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QY Puppis, HD63302, HIP38031

QY Puppis is a orange to red pulsating very luminous supergiant 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.

HIP38031 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD63302.

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

Location of QY 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 QY Puppis, the location is 07h 47m 38.53 and -15d59`26.5 .

Proper Motion of QY 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 3.42 ± 0.24 miliarcseconds/year towards the north and -1.17 ± 0.47 miliarcseconds/year east if we saw them in the horizon.

QY Puppis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 17000.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

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

QY Puppis has a spectral type of K3Iab/b. This means the star is a orange to red supergiant star. The star has a B-V Colour Index of 1.79 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,073 Kelvin.

QY Puppis Radius has been calculated as being 125.84 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 87,557,081.85.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 104.18. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.12 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

QY Puppis Apparent and Absolute Magnitudes

QY Puppis has an apparent magnitude of 6.31 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 -2.91 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.50. 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 QY Puppis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.43 which gave the calculated distance to QY Puppis as 2280.86 light years away from Earth or 699.30 parsecs. It would take a spaceship travelling at the speed of light, 2280.86 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 1.73 which put QY Puppis at a distance of 1885.34 light years or 578.03 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.

Variable Type of QY Puppis

The star is a pulsating Semiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral 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. QY Puppis brightness ranges from a magnitude of 6.566 to a magnitude of 6.393 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.

QY Puppis Facts

Alternative Names

Traditional/Proper NameQY Puppis
Short NameQY Pup
Hipparcos Library I.D.38031
Bonner DurchmusterungBD-15 2049
Henry Draper Designation63302

Visual Facts

Star Typesupergiant star
Absolute Magnitude-2.91 / -2.50
Visual / Apparent Magnitude6.31
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 47m 38.53
Declination (Dec.)-15d59`26.5
Galactic Latitude4.71 degrees
Galactic Longitude233.59 degrees
1997 Distance from Earth1.43 Parallax (milliarcseconds)
 2280.86 Light Years
 699.30 Parsecs
2007 Revised Distance from Earth1.73 Parallax (milliarcseconds)
 1885.34 Light Years
 578.03 Parsecs
Proper Motion Dec.3.42 ± 0.24 milliarcseconds/year
Proper Motion RA.-1.17 ± 0.47 milliarcseconds/year
B-V Index1.79
Radial Velocity48.30 ± 1.20 km/s
Iron Abundance0.12 ± 9.99 Fe/H
Spectral TypeK3Iab/b
Colour(K) Orange to Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral
Mean Variability Period in Days0.145
Variable Magnitude Range (Brighter - Dimmer)6.393 - 6.566

Estimated Facts

Luminosity (x the Sun)17,000.0000000
Calculated Effective Temperature3,073 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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
63302-15 2049.0B6.70000-5.00000-2.00000K0Orange1914
P14.300001909

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