Universe Guide


4 Leonis Minoris - HD73596 - HIP42538

4 Leonis Minoris is a blue to white giant star that can be located in the constellation of Cancer. HIP42538 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD73596. 4 Leonis Minoris has alternative name(s), 4 Cancri , 4 Cnc.

Location of 4 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 4 Leonis Minoris, the location is 08h 40m 18.31 and +31d56`31.1 .

Proper Motion of 4 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 -032.56 ± 000.27 towards the north and -039.22 ± 000.50 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 4 Leonis Minoris

4 Leonis Minoris has a spectral type of F5III. This means the star is a blue to white giant star. The star has a B-V Colour Index of 0.4 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,728 Kelvin.

4 Leonis Minoris has been calculated as 4.24 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,948,530.04.km.

4 Leonis Minoris Apparent and Absolute Magnitudes

4 Leonis Minoris has an apparent magnitude of 6.21 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 1.05 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.74. 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 4 Leonis Minoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.31 which gave the calculated distance to 4 Leonis Minoris as 350.34 light years away from Earth or 107.41 parsecs. It would take a spaceship travelling at the speed of light, 350.34 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 8.07 which put 4 Leonis Minoris at a distance of 404.17 light years or 123.92 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

4 Leonis Minoris Facts

Alternative Names

Traditional Name4 Leonis Minoris
Short Name4 Cnc
Alternative Name(s)4 Cancri
Hipparcos Library I.D.42538
Bonner DurchmusterungBD+32 1776
Henry Draper Designation73596

Visual Facts

Star Typegiant star
Absolute Magnitude1.05 / 0.74
Apparent Magnitude6.21
Right Ascension (R.A.)08h 40m 18.31
Declination (Dec.)+31d56`31.1
1997 Distance from Earth9.31 Parallax (milliarcseconds)
 350.34 Light Years
 107.41 Parsecs
2007 Revised Distance from Earth8.07 Parallax (milliarcseconds)
 404.17 Light Years
 123.92 Parsecs
Proper Motion Dec.-32.56 ± 0.27 milliarcseconds/year
Proper Motion RA.-39.22 ± 0.50 milliarcseconds/year
B-V Index0.40
Spectral TypeF5III
Colour(F) blue to white

Estimated Facts

Radius (x the Sun)4.24
Calculated Effective Temperature6,728 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Add a Comment

Email: (Optional)