Universe Guide


SS Leporis, 17 Leporis, HD41511, HIP28816

SS Leporis is a blue cataclysmic star that can be located in the constellation of Lepus. SS Leporis is the brightest star in Lepus 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.

HIP28816 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD41511.

SS Leporis has alternative name(s), SS Lep.

Location of SS Leporis

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 SS Leporis, the location is 06h 04m 59.13 and -16d29`03.9 .

Proper Motion of SS Leporis

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 -3.74 ± 0.18 miliarcseconds/year towards the north and -5.85 ± 0.31 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of SS Leporis

SS Leporis has a spectral type of Ap shell. This means the star is a blue star. The star is 7595.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24772.1059768000000000s. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,480 Kelvin.

SS Leporis Radius has been calculated as being 18.93 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,170,757.36.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 16.04. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

SS Leporis Apparent and Absolute Magnitudes

SS Leporis has an apparent magnitude of 4.92 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 -2.66 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.30. 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 SS Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.05 which gave the calculated distance to SS Leporis as 1069.39 light years away from Earth or 327.87 parsecs. It would take a spaceship travelling at the speed of light, 1069.39 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 3.59 which put SS Leporis at a distance of 908.53 light years or 278.55 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 7,595.00 Parsecs or 24,772.11 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of SS Leporis

The star is a cataclysmic Symbiotic s of the Z Andromedae variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. SS Leporis brightness ranges from a magnitude of 5.010 to a magnitude of 4.957 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

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.

SS Leporis Facts

Alternative Names

Traditional/Proper NameSS Leporis
Flamsteed Name17 Leporis
Flamsteed Short Name17 Lep
Short NameSS Lep
Hipparcos Library I.D.28816
Bonner DurchmusterungBD-16 1349
Henry Draper Designation41511

Visual Facts

Star Type star
Absolute Magnitude-2.66 / -2.30
Visual / Apparent Magnitude4.92
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 04m 59.13
Declination (Dec.)-16d29`03.9
Galactic Latitude-17.53 degrees
Galactic Longitude222.87 degrees
1997 Distance from Earth3.05 Parallax (milliarcseconds)
 1069.39 Light Years
 327.87 Parsecs
2007 Revised Distance from Earth3.59 Parallax (milliarcseconds)
 908.53 Light Years
 278.55 Parsecs
Galacto-Centric Distance24,772.11 Light Years / 7,595.00 Parsecs
Proper Motion Dec.-3.74 ± 0.18 milliarcseconds/year
Proper Motion RA.-5.85 ± 0.31 milliarcseconds/year
B-V Index0.19
Radial Velocity15.10 ± 3.70 km/s
Spectral TypeAp shell
Colour(A) blue

Variable Star Details

Variable Star ClassCataclysmic
Variable Star TypeSymbiotic s of the Z Andromedae
Mean Variability Period in Days0.040
Variable Magnitude Range (Brighter - Dimmer)4.957 - 5.010

Estimated Facts

Calculated Effective Temperature7,480 Kelvin

Sources and Links

SIMBAD SourceLink

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