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2 Leonis Minoris, 2 Cancri, HD73427, HIP42472

2 Leonis Minoris is a orange to red star that can be located in the constellation of Cancer. The star can not be seen by the naked eye, you need a telescope to see it.

HIP42472 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD73427.

Location of 2 Leonis Minoris

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 2 Leonis Minoris, the location is 08h 39m 31.87 and +32d 30` 56.4 .

Proper Motion of 2 Leonis Minoris

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 -18.97 ± 0.34 miliarcseconds/year towards the north and -12.88 ± 0.58 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 2 Leonis Minoris

2 Leonis Minoris has a spectral type of K5. This means the star is a orange to red star. The star has a B-V Colour Index of 1.45 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,115 Kelvin.

2 Leonis Minoris Radius has been calculated as being 29.52 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,542,734.97.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 31.35. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

2 Leonis Minoris Apparent and Absolute Magnitudes

2 Leonis Minoris has an apparent magnitude of 6.71 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 -1.03 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.16. 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 2 Leonis Minoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.83 which gave the calculated distance to 2 Leonis Minoris as 1152.52 light years away from Earth or 353.36 parsecs. It would take a spaceship travelling at the speed of light, 1152.52 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 2.67 which put 2 Leonis Minoris at a distance of 1221.59 light years or 374.53 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.

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.

2 Leonis Minoris Facts

Alternative Names

Traditional/Proper Name2 Leonis Minoris
Flamsteed Name2 Cancri
Flamsteed Short Name2 Cnc
Hipparcos Library I.D.42472
Bonner DurchmusterungBD+33 1732
Henry Draper Designation73427

Visual Facts

Star Type star
Absolute Magnitude-1.03 / -1.16
Visual / Apparent Magnitude6.71
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 39m 31.87
Declination (Dec.)+32d 30` 56.4
Galactic Latitude35.88 degrees
Galactic Longitude190.92 degrees
1997 Distance from Earth2.83 Parallax (milliarcseconds)
 1152.52 Light Years
 353.36 Parsecs
2007 Revised Distance from Earth2.67 Parallax (milliarcseconds)
 1221.59 Light Years
 374.53 Parsecs
Proper Motion Dec.-18.97 ± 0.34 milliarcseconds/year
Proper Motion RA.-12.88 ± 0.58 milliarcseconds/year
B-V Index1.45
Spectral TypeK5
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,115 Kelvin

Sources and Links

SIMBAD SourceLink

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