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Phi2 Pavonis, HD196378, HIP101983, HR7875

Phi2 Pavonis is a blue to white 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. The star has an estimated age of 5.10 Billion of Years but could be as young as 4.80 to 5.40 according to Hipparcos.

Phi2 Pavonis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7875. HIP101983 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD196378. The Gliese ID of the star is GL 794.2. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names.

Location of Phi2 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 Phi2 Pavonis, the location is 20h 40m 02.27 and -60d 32` 51.0 .

Proper Motion of Phi2 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 -569.91 ± 0.18 miliarcseconds/year towards the north and 313.48 ± 0.27 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 -29.50000 km/s with an error of about 0.48 km/s .

Phi2 Pavonis 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 1.0000000 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, Age, Radius) of Phi2 Pavonis

Phi2 Pavonis has a spectral type of F8V. This means the star is a blue to white star. The star is 7382.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24077.3780540800000000s. The star has a B-V Colour Index of 0.54 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,122 Kelvin.

Phi2 Pavonis Radius has been calculated as being 1.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,329,137.35.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.95. 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 -0.37 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 5.10 Billion years old but could be between 4.80 and 5.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Phi2 Pavonis Apparent and Absolute Magnitudes

Phi2 Pavonis has an apparent magnitude of 5.11 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 3.19 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.15. 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 Phi2 Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 41.33 which gave the calculated distance to Phi2 Pavonis as 78.92 light years away from Earth or 24.20 parsecs. It would take a spaceship travelling at the speed of light, 78.92 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 40.55 which put Phi2 Pavonis at a distance of 80.43 light years or 24.66 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 7,382.00 Parsecs or 24,077.38 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Phi2 Pavonis Facts

Alternative Names

Bayer DesignationPhi2 Pavonis
Hipparcos Library I.D.101983
Yale Bright Star Catalogue (HR) Id7875
Gliese IDGL 794.2
Henry Draper Designation196378

Visual Facts

Star Type star
Age5.10 Billion Years Old
Age Range4.80 - 5.40 Billion Years Old
Absolute Magnitude3.19 / 3.15
Visual / Apparent Magnitude5.11
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 40m 02.27
Declination (Dec.)-60d 32` 51.0
Galactic Latitude-36.64 degrees
Galactic Longitude335.97 degrees
1997 Distance from Earth41.33 Parallax (milliarcseconds)
 78.92 Light Years
 24.20 Parsecs
2007 Revised Distance from Earth40.55 Parallax (milliarcseconds)
 80.43 Light Years
 24.66 Parsecs
Galacto-Centric Distance24,077.38 Light Years / 7,382.00 Parsecs
Proper Motion Dec.-569.91 ± 0.18 milliarcseconds/year
Proper Motion RA.313.48 ± 0.27 milliarcseconds/year
B-V Index0.54
Radial Velocity-29.50 ± 0.48 km/s
Iron Abundance-0.37 ± 0.02 Fe/H
Spectral TypeF8V
Associated / Clustered StarsPhi1 Pavonis
Colour(F) blue to white

Estimated Facts

Luminosity (x the Sun)1.0000000
Calculated Effective Temperature6,122 Kelvin

Sources and Links

SIMBAD SourceLink

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