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UY Leonis Minoris

UY Leonis Minoris Facts

  • UY Leonis Minoris is a eruptive variable star that can be located in the constellation of Leo Minor. The description is based on the spectral class.
  • UY Leonis Minoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M...) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 3792.60 light years away from us. Distance

UY Leonis Minoris's Alternative Names

HIP52723 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD93287.

UY Leonis Minoris has alternative name(s) :- , UY LMi.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+35 2181.

More details on objects' alternative names can be found at Star Names .

Location of UY Leonis Minoris

The location of the variable star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For UY Leonis Minoris, the location is 10h 46m 44.27 and +34° 43` 52.4 .

Proper Motion of UY 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 4.26 ± 0.51 milliarcseconds/year towards the north and -20.08 ± 0.82 milliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of UY Leonis Minoris

UY Leonis Minoris Temperature and Colour

Based on the star's spectral type of M... , UY Leonis Minoris's colour and type is red variable star. The star has a B-V Colour Index of 1.64 which means the star's temperature is about 3,659 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

UY Leonis Minoris Radius

UY Leonis Minoris estimated radius has been calculated as being 61.12 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 42,528,848.90.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

UY Leonis Minoris Apparent and Absolute Magnitudes

UY Leonis Minoris has an apparent magnitude of 8.23 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -2.10 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 UY Leonis Minoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.86000 which gave the calculated distance to UY Leonis Minoris as 3792.60 light years away from Earth or 1162.79 parsecs. If you want that in miles, it is about 22,295,274,590,336,159.29, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to UY Leonis Minoris

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4635,845,156,786.35
Car12021,194,838,559.55
Airbus A3807363,455,680,199.93
Speed of Sound (Mach 1)767.2693,314,848,673.86
Concorde (Mach 2)1,534.541,657,422,176.77
New Horizons Probe33,00077,072,140.22
Speed of Light670,616,629.003,792.60

Variable Type of UY Leonis Minoris

The star is a eruptive Irregular 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. UY Leonis Minoris brightness ranges from a magnitude of 8.354 to a magnitude of 8.129 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.

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Additional UY Leonis Minoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameUY Leonis Minoris
Alternative NamesHD 93287, HIP 52723, BD+35 2181, UY LMi
Spectral TypeM...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationLeo Minor
Absolute Magnitude -2.10
Visual / Apparent Magnitude8.23
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 46m 44.27
Declination (Dec.)+34° 43` 52.4
Galactic Latitude62.32346457 degrees
Galactic Longitude189.26855368 degrees
Distance from Earth0.86000 Parallax (milliarcseconds)
 3792.60 Light Years
 1162.79 Parsecs
 239,840,982.82 Astronomical Units
Proper Motion Dec.4.26000 ± 0.51000 milliarcseconds/year
Proper Motion RA.-20.08000 ± 0.82000 milliarcseconds/year
B-V Index1.64

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star Type Irregular
Mean Variability Period in Days0.197
Variable Magnitude Range (Brighter - Dimmer)8.129 - 8.354

Estimated Calculated Facts


Radius (x the Sun)61.12
Effective Temperature3,659 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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