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RZ Scuti - HD169753 - HIP90382

RZ Scuti is a blue eclipsing very luminous supergiant star that can be located in the constellation of Scutum. The star can not be seen by the naked eye, you need a telescope to see it.

HIP90382 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD169753.

RZ Scuti has alternative name(s), RZ_Sct.

Location of RZ Scuti

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 RZ Scuti, the location is 18h 26m 33.52 and -09d12`06.0 .

Proper Motion of RZ Scuti

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 -3.21 ± 0.59 miliarcseconds/year towards the north and 0.63 ± 0.85 miliarcseconds/year east if we saw them in the horizon.

RZ Scuti 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 180000.0000000 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 RZ Scuti

RZ Scuti has a spectral type of B3Ib. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.66 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,739 Kelvin.

RZ Scuti Radius has been calculated as being 23.73 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 16,509,541.63.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 20.57. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

RZ Scuti Apparent and Absolute Magnitudes

RZ Scuti has an apparent magnitude of 7.52 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 -2.00 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.69. 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 RZ Scuti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.25 which gave the calculated distance to RZ Scuti as 2609.31 light years away from Earth or 800 parsecs. It would take a spaceship travelling at the speed of light, 2609.31 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 1.44 which put RZ Scuti at a distance of 2265.02 light years or 694.44 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 RZ Scuti

The star is a eclipsing Beta Persei (Algol)/System with one or both giant or supergiant components 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. RZ Scuti brightness ranges from a magnitude of 8.000 to a magnitude of 8.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

RZ Scuti Facts

Alternative Names

Traditional/Proper NameRZ Scuti
Short NameRZ Sct
Hipparcos Library I.D.90382
Bonner DurchmusterungBDD-09 4736
Henry Draper Designation169753

Visual Facts

Star Typesupergiant star
Absolute Magnitude-2.00 / -1.69
Visual / Apparent Magnitude7.52
Naked Eye VisibleRequires a 7x50 Binoculars - Ref: Wiki
Right Ascension (R.A.)18h 26m 33.52
Declination (Dec.)-09d12`06.0
Galactic Latitude1.28 degrees
Galactic Longitude21.91 degrees
1997 Distance from Earth1.25 Parallax (milliarcseconds)
 2609.31 Light Years
 800 Parsecs
2007 Revised Distance from Earth1.44 Parallax (milliarcseconds)
 2265.02 Light Years
 694.44 Parsecs
Proper Motion Dec.-3.21 ± 0.59 milliarcseconds/year
Proper Motion RA.0.63 ± 0.85 milliarcseconds/year
B-V Index0.66
Radial Velocity-14.50 ± 10.00 km/s
Spectral TypeB3Ib
Colour(B) blue

Variable Star Details

Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/System with one or both giant or supergiant components

Estimated Facts

Luminosity (x the Sun)180,000.0000000
Calculated Effective Temperature5,739 Kelvin

Sources and Links

SIMBAD SourceLink

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