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Rho Pavonis, HD195961, HIP101773, HR7859

Rho Pavonis is a blue to white pulsating star that can be located in the constellation of Pavo. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Rho Pavonis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7859. HIP101773 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD195961.

Rho Pavonis has alternative name(s), rho Pav.

Location of Rho Pavonis

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 Rho Pavonis, the location is 20h 37m 35.24 and -61d 31` 47.1 .

Proper Motion of Rho Pavonis

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 -72.69 ± 0.16 miliarcseconds/year towards the north and 59.61 ± 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 8.00000 km/s with an error of about 0.80 km/s .

Physical Properties (Colour, Temperature, Radius) of Rho Pavonis

Rho Pavonis has a spectral type of Fm delta Del. This means the star is a blue to white star. The star is 7358.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23999.0988515200000000s. The star has a B-V Colour Index of 0.44 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,276 Kelvin.

Rho Pavonis Radius has been calculated as being 5.03 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,499,551.10.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.89. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Rho Pavonis Apparent and Absolute Magnitudes

Rho Pavonis has an apparent magnitude of 4.86 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 0.98 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.04. 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 Rho Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.73 which gave the calculated distance to Rho Pavonis as 194.96 light years away from Earth or 59.77 parsecs. It would take a spaceship travelling at the speed of light, 194.96 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 17.20 which put Rho Pavonis at a distance of 189.63 light years or 58.14 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 7,358.00 Parsecs or 23,999.10 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 Rho Pavonis

The star is a pulsating Delta Scuti 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. Rho Pavonis brightness ranges from a magnitude of 4.973 to a magnitude of 4.939 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

Rho Pavonis Facts

Alternative Names

Short Namerho Pav
Bayer DesignationRho Pavonis
Hipparcos Library I.D.101773
Yale Bright Star Catalogue (HR) Id7859
Henry Draper Designation195961

Visual Facts

Star Type star
Absolute Magnitude0.98 / 1.04
Visual / Apparent Magnitude4.86
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 37m 35.24
Declination (Dec.)-61d 31` 47.1
Galactic Latitude-36.18 degrees
Galactic Longitude334.83 degrees
1997 Distance from Earth16.73 Parallax (milliarcseconds)
 194.96 Light Years
 59.77 Parsecs
2007 Revised Distance from Earth17.20 Parallax (milliarcseconds)
 189.63 Light Years
 58.14 Parsecs
Galacto-Centric Distance23,999.10 Light Years / 7,358.00 Parsecs
Proper Motion Dec.-72.69 ± 0.16 milliarcseconds/year
Proper Motion RA.59.61 ± 0.24 milliarcseconds/year
B-V Index0.44
Radial Velocity8.00 ± 0.80 km/s
Spectral TypeFm delta Del
Colour(F) blue to white

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeDelta Scuti
Mean Variability Period in Days0.025
Variable Magnitude Range (Brighter - Dimmer)4.939 - 4.973

Estimated Facts

Calculated Effective Temperature6,276 Kelvin

Sources and Links

SIMBAD SourceLink

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