Universe Guide


Mu2 Pavonis, HD188887, HIP98624

Mu2 Pavonis is a orange to red subgiant star that can be located in the constellation of Pavo. Mu2 Pavonis is the brightest star in Pavo based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Mu2 Pavonis is the Bayer Classification for the star. HIP98624 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD188887.

Location of Mu2 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 Mu2 Pavonis, the location is 20h 01m 52.40 and -66d56`37.7 .

Proper Motion of Mu2 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 -70.82 ± 0.21 miliarcseconds/year towards the north and 38.64 ± 0.34 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Mu2 Pavonis

Mu2 Pavonis has a spectral type of K2IVCN.... This means the star is a orange to red subgiant star. The star is 7347.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23963.2208836800000000s. The star has a B-V Colour Index of 1.21 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,472 Kelvin.

Mu2 Pavonis Radius has been calculated as being 9.64 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,704,617.87.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.73. 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 0.07 with an error value of 0.05 Fe/H with the Sun has a value of 1 to put it into context.

Mu2 Pavonis Apparent and Absolute Magnitudes

Mu2 Pavonis has an apparent magnitude of 5.32 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 1.04 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.02. 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 Mu2 Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.91 which gave the calculated distance to Mu2 Pavonis as 234.48 light years away from Earth or 71.89 parsecs. It would take a spaceship travelling at the speed of light, 234.48 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 13.80 which put Mu2 Pavonis at a distance of 236.35 light years or 72.46 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 7,347.00 Parsecs or 23,963.22 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.

Mu2 Pavonis Facts

Alternative Names

Bayer DesignationMu2 Pavonis
Hipparcos Library I.D.98624
Henry Draper Designation188887

Visual Facts

Star Typesubgiant star
Absolute Magnitude1.04 / 1.02
Visual / Apparent Magnitude5.32
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 01m 52.40
Declination (Dec.)-66d56`37.7
Galactic Latitude-31.67 degrees
Galactic Longitude328.95 degrees
1997 Distance from Earth13.91 Parallax (milliarcseconds)
 234.48 Light Years
 71.89 Parsecs
2007 Revised Distance from Earth13.80 Parallax (milliarcseconds)
 236.35 Light Years
 72.46 Parsecs
Galacto-Centric Distance23,963.22 Light Years / 7,347.00 Parsecs
Proper Motion Dec.-70.82 ± 0.21 milliarcseconds/year
Proper Motion RA.38.64 ± 0.34 milliarcseconds/year
B-V Index1.21
Radial Velocity41.90 ± 0.80 km/s
Iron Abundance0.07 ± 0.05 Fe/H
Spectral TypeK2IVCN...
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,472 Kelvin

Sources and Links

SIMBAD SourceLink

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