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Lalande 21185 - HD95735 - HIP54035

Lalande 21185 is a red main sequence dwarf star that can be located in the constellation of UrsaMajor. The star can not be seen by the naked eye, you need a telescope to see it.

HIP54035 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD95735. The Gliese ID of the star is Gliese GL411. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names. Lalande 21185 has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Lalande 21185

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 Lalande 21185, the location is 11h 03m 20.61 and +35d58`53.3 .

Proper Motion of Lalande 21185

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 -4,765.85 ± 0.44 miliarcseconds/year towards the north and -580.27 ± 0.67 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Lalande 21185

Lalande 21185 has a spectral type of M2V. This means the star is a red main sequence dwarf star. The star is 7401.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24139.3490894400000000s. The star has a B-V Colour Index of 1.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,989 Kelvin.

Lalande 21185 Radius has been calculated as being 0.16 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 110,041.64.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.16. 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 -0.30 with an error value of 0.05 Fe/H with the Sun has a value of 1 to put it into context.

Lalande 21185 Apparent and Absolute Magnitudes

Lalande 21185 has an apparent magnitude of 7.49 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 10.46 If you used the 2007 Parallax value, you would get an absolute magnitude of 10.46. 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 Lalande 21185

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 392.40 which gave the calculated distance to Lalande 21185 as 8.31 light years away from Earth or 2.55 parsecs. It would take a spaceship travelling at the speed of light, 8.31 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 392.64 which put Lalande 21185 at a distance of 8.31 light years or 2.55 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 7,401.00 Parsecs or 24,139.35 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.

Lalande 21185 Facts

Alternative Names

Traditional/Proper NameLalande 21185
Hipparcos Library I.D.54035
Bonner DurchmusterungBDD+36 2147
Gliese ID411
Henry Draper Designation95735

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude10.46 / 10.46
Visual / Apparent Magnitude7.49
Naked Eye VisibleRequires a 7x50 Binoculars - Ref: Wiki
Right Ascension (R.A.)11h 03m 20.61
Declination (Dec.)+35d58`53.3
Galactic Latitude65.43 degrees
Galactic Longitude185.09 degrees
1997 Distance from Earth392.40 Parallax (milliarcseconds)
 8.31 Light Years
 2.55 Parsecs
2007 Revised Distance from Earth392.64 Parallax (milliarcseconds)
 8.31 Light Years
 2.55 Parsecs
Galacto-Centric Distance24,139.35 Light Years / 7,401.00 Parsecs
Proper Motion Dec.-4765.85 ± 0.44 milliarcseconds/year
Proper Motion RA.-580.27 ± 0.67 milliarcseconds/year
B-V Index1.50
Radial Velocity-84.69 ± 0.10 km/s
Iron Abundance-0.30 ± 0.05 Fe/H
Spectral TypeM2V
Colour(M) Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature3,989 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


List of Extrasolar Planets orbiting Lalande 21185


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Lalande 21185 BConfirmed0.0129.8692017

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