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Mu2 Chamaeleontis, HD88351, HIP49326, HR3997

Primary Facts on Mu2 Chamaeleontis

  • Mu2 Chamaeleontis's star type is giant star that can be located in the constellation of Chamaeleon. The description is based on the spectral class.
  • Mu2 Chamaeleontis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G6/G8III) of the star, the star's colour is white to yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 521.03 light years away from us.

Mu2 Chamaeleontis's Alternative Names

Mu2 Chamaeleontis (Mu.02 Cha) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR3997. HIP49326 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD88351.

More details on star alternative names can be found at Star Names .

Location of Mu2 Chamaeleontis

The location of the star in the night sky 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 Chamaeleontis, the location is 10h 04m 07.37 and -81° 33` 56.2 .

Radial Velocity and Proper Motion of Mu2 Chamaeleontis

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 52.69 ± 0.22 miliarcseconds/year towards the north and -49.76 ± 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 the Sun is 0.00 km/s with an error of about 4.50 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Mu2 Chamaeleontis 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 65.30 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Mu2 Chamaeleontis

Mu2 Chamaeleontis has a spectral type of G6/G8III. This means the star is a white to yellow giant star. The star is 7,334.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,920.82 s. The star has a B-V Colour Index of 0.91 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,031 Kelvin.

Mu2 Chamaeleontis Radius has been calculated as being 10.18 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,080,683.31.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.41. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Mu2 Chamaeleontis Apparent and Absolute Magnitudes

Mu2 Chamaeleontis has an apparent magnitude of 6.60 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 0.41 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.58. 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 Chamaeleontis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.78 which gave the calculated distance to Mu2 Chamaeleontis as 564.30 light years away from Earth or 173.01 parsecs. It would take a spaceship travelling at the speed of light, 564.30 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 6.26 which put Mu2 Chamaeleontis at a distance of 521.03 light years or 159.74 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.

Using the 2007 distance, the star is roughly 32,948,510.56 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,334.00 Parsecs or 23,920.82 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.

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Additional Mu2 Chamaeleontis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameMu2 Chamaeleontis
Alternative NamesMu.02 Cha, HD 88351, HIP 49326, HR 3997
Spectral TypeG6/G8III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationChamaeleon
Absolute Magnitude 0.41 / 0.58
Visual / Apparent Magnitude6.60
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 04m 07.37
Declination (Dec.)-81° 33` 56.2
Galactic Latitude-20.72 degrees
Galactic Longitude296.93 degrees
1997 Distance from Earth5.78 Parallax (milliarcseconds)
 564.30 Light Years
 173.01 Parsecs
2007 Distance from Earth6.26 Parallax (milliarcseconds)
 521.03 Light Years
 159.74 Parsecs
 32,948,510.56 Astronomical Units
Galacto-Centric Distance23,920.82 Light Years / 7,334.00 Parsecs
Proper Motion Dec.52.69 ± 0.22 milliarcseconds/year
Proper Motion RA.-49.76 ± 0.27 milliarcseconds/year
B-V Index0.91
Radial Velocity0.00 ± 4.50 km/s
Eccentricity0.17
Semi-Major Axis6616.00
Stellar Luminosity (Lsun)65.30
Associated / Clustered StarsMu1 Chamaeleontis

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature5,031 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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