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RY Leporis, HD38882, HIP27400

RY Leporis is a blue pulsating main sequence dwarf star that can be located in the constellation of Lepus. The star can not be seen by the naked eye, you need a telescope to see it.

HIP27400 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD38882.

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

Location of RY 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 RY Leporis, the location is 05h 48m 10.26 and -20d 01` 25.2 .

Proper Motion of RY 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 23.72 ± 0.56 miliarcseconds/year towards the north and 1.30 ± 0.85 miliarcseconds/year east if we saw them in the horizon.

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

RY Leporis has a spectral type of A9V. This means the star is a blue main sequence dwarf star. The star is 7527.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24550.3149028800000000s. The star has a B-V Colour Index of 0.37 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,870 Kelvin.

RY Leporis Radius has been calculated as being 2.35 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,634,753.83.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.93. 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 0.05 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

RY Leporis Apparent and Absolute Magnitudes

RY Leporis has an apparent magnitude of 8.25 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 2.24 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.76. 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 RY Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.27 which gave the calculated distance to RY Leporis as 520.20 light years away from Earth or 159.49 parsecs. It would take a spaceship travelling at the speed of light, 520.20 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 5.04 which put RY Leporis at a distance of 647.15 light years or 198.41 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 7,527.00 Parsecs or 24,550.31 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 RY Leporis

The star is a pulsating RR Lyrae type with nearly symmetric 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. RY Leporis brightness ranges from a magnitude of 8.557 to a magnitude of 8.171 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

RY Leporis Facts

Alternative Names

Traditional/Proper NameRY Leporis
Short NameRY Lep
Hipparcos Library I.D.27400
Bonner DurchmusterungBD-20 1188
Henry Draper Designation38882

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude2.24 / 1.76
Visual / Apparent Magnitude8.25
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 48m 10.26
Declination (Dec.)-20d 01` 25.2
Galactic Latitude-22.58 degrees
Galactic Longitude224.68 degrees
1997 Distance from Earth6.27 Parallax (milliarcseconds)
 520.20 Light Years
 159.49 Parsecs
2007 Revised Distance from Earth5.04 Parallax (milliarcseconds)
 647.15 Light Years
 198.41 Parsecs
Galacto-Centric Distance24,550.31 Light Years / 7,527.00 Parsecs
Proper Motion Dec.23.72 ± 0.56 milliarcseconds/year
Proper Motion RA.1.30 ± 0.85 milliarcseconds/year
B-V Index0.37
Iron Abundance0.05 ± 9.99 Fe/H
Spectral TypeA9V
Colour(A) blue

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with nearly symmetric
Mean Variability Period in Days0.225
Variable Magnitude Range (Brighter - Dimmer)8.171 - 8.557

Estimated Facts

Calculated Effective Temperature6,870 Kelvin

Sources and Links

SIMBAD SourceLink

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