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44 Leonis

44 Leonis Facts

  • 44 Leonis is a pulsating giant star that can be located in the constellation of Leo. The description is based on the spectral class.
  • 44 Leonis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2IIIs) of the star, the star's colour is red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 1025.67 light years away from us. Distance

44 Leonis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4088. HIP51008 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD90254.

44 Leonis has alternative name(s) :- , DE Leo.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 44 Leonis. The Flamsteed name can be shortened to 44 Leo.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 13 G. Leonis. There are no stars with a Gould designation in Ursa Major for example.

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+09 2351.

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

Location of 44 Leonis

The location of the giant 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 44 Leonis, the location is 10h 25m 15.19 and +08° 47` 05.8 .

Radial Velocity and Proper Motion of 44 Leonis

Proper Motion

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 -38.10 ± 0.31 milliarcseconds/year towards the north and 10.77 ± 0.49 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -20.52000 km/s with an error of about 0.21 km/s . 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 44 Leonis

44 Leonis Temperature and Colour

Based on the star's spectral type of M2IIIs , 44 Leonis's colour and type is red giant star. The star has a B-V Colour Index of 1.63 which means the star's temperature is about 3,700 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

44 Leonis Radius

44 Leonis estimated radius has been calculated as being 37.03 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 25,762,902.43.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 54.01550175352118320865379696. 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.

44 Leonis Iron Abundance

44 Leonis Iron Abundance is -0.09 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

44 Leonis Apparent and Absolute Magnitudes

44 Leonis has an apparent magnitude of 5.61 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 -1.06 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.88. 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 44 Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.63000 which gave the calculated distance to 44 Leonis as 704.46 light years away from Earth or 215.98 parsecs. If you want that in miles, it is about 4,141,256,430,392,925.90, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 3.18000 which put 44 Leonis at a distance of 1025.67 light years or 314.47 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.

Using the 2007 distance, the star is roughly 64,863,641.64 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. The star's Galacto-Centric Distance is 7,519.00 Parsecs or 24,524.22 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 44 Leonis

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)
Walking4171,957,839,466.61
Car1205,731,927,982.22
Airbus A380736934,553,475.36
Speed of Sound (Mach 1)767.269896,467,025.08
Concorde (Mach 2)1,534.54448,232,928.35
New Horizons Probe33,00020,843,374.48
Speed of Light670,616,629.001,025.67

Variable Type of 44 Leonis

The star is a pulsating Semi-Regular Star w 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. 44 Leonis brightness ranges from a magnitude of 5.721 to a magnitude of 5.665 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 44 Leonis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name44 Leonis
Alternative NamesHD 90254, HIP 51008, HR 4088, 13 G. Leonis, 44 Leo, BD+09 2351, DE Leo
Spectral TypeM2IIIs
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationLeo
Absolute Magnitude -1.06 / -1.88
Visual / Apparent Magnitude5.61
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)10h 25m 15.19
Declination (Dec.)+08° 47` 05.8
Galactic Latitude50.91837893 degrees
Galactic Longitude233.94946460 degrees
1997 Distance from Earth4.63000 Parallax (milliarcseconds)
 704.46 Light Years
 215.98 Parsecs
2007 Distance from Earth3.18000 Parallax (milliarcseconds)
 1025.67 Light Years
 314.47 Parsecs
 64,863,641.64 Astronomical Units
Galacto-Centric Distance24,524.22 Light Years / 7,519.00 Parsecs
Proper Motion Dec.-38.10000 ± 0.31000 milliarcseconds/year
Proper Motion RA.10.77000 ± 0.49000 milliarcseconds/year
B-V Index1.63
Radial Velocity-20.52000 ± 0.21 km/s
Iron Abundance-0.0900 ± 9.99 Fe/H
Eccentricity0.31680
Semi-Major Axis6729.0000000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.050
Variable Magnitude Range (Brighter - Dimmer)5.665 - 5.721

Estimated Calculated Facts


Radius (x the Sun)54.02
Effective Temperature3,700 Kelvin

Sources and Links


SIMBAD SourceLink

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