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48 Virginis

48 Virginis Facts

48 Virginis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4937. HIP63750 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD113459.

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 48 Virginis. The Flamsteed name can be shortened to 48 Vir.

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 107 G. Virginis. 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-02 3622.

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

Location of 48 Virginis

The location of the main sequence 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 48 Virginis, the location is 13h 03m 54.44 and -03° 39` 47.0 .

Radial Velocity and Proper Motion of 48 Virginis

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 -40.68 ± 1.04 milliarcseconds/year towards the north and -35.46 ± 1.56 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 3.00 km/s with an error of about 3.70 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 (Colour, Temperature) of 48 Virginis

48 Virginis Colour and Temperature

48 Virginis has a spectral type of F0V. This means the star is a yellow to white main sequence star. The star has a B-V Colour Index of 0.29 which means the star's temperature is about 7,270 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

48 Virginis Radius

Radius has been calculated as being 3.48 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,422,745.62.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 4.32. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

48 Virginis Apparent and Absolute Magnitudes

48 Virginis has an apparent magnitude of 6.62 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 1.14 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.67. 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 48 Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.00 which gave the calculated distance to 48 Virginis as 407.70 light years away from Earth or 125 parsecs. If you want that in miles, it is 273,410,399,643.

In 2007, Hipparcos data was revised with a new parallax of 6.45 which put 48 Virginis at a distance of 505.68 light years or 155.04 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 31,979,072.73 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.

Travel Time to 48 Virginis

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)
Walking484,779,354,238.18
Car1202,825,978,474.61
Airbus A380736460,757,359.99
Speed of Sound (Mach 1)767.269441,979,823.18
Concorde (Mach 2)1,534.54220,989,623.57
New Horizons Probe33,00010,276,285.36
Speed of Light670,616,629.00505.68

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 48 Virginis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name48 Virginis
Alternative NamesHD 113459, HIP 63750, HR 4937, 107 G. Virginis, 48 Vir, BD-02 3622
Spectral TypeF0V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
ConstellationVirgo
Absolute Magnitude 1.14 / 0.67
Visual / Apparent Magnitude 6.62
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 03m 54.44
Declination (Dec.)-03° 39` 47.0
Galactic Latitude59.06 degrees
Galactic Longitude308.99 degrees
1997 Distance from Earth8.00 Parallax (milliarcseconds)
 407.70 Light Years
 125 Parsecs
2007 Distance from Earth6.45 Parallax (milliarcseconds)
 505.68 Light Years
 155.04 Parsecs
 31,979,072.73 Astronomical Units
Proper Motion Dec.-40.68 ± 1.04 milliarcseconds/year
Proper Motion RA.-35.46 ± 1.56 milliarcseconds/year
B-V Index0.29
Radial Velocity3.00 ± 3.70 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)4.32
Effective Temperature7,270 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
113459-02 3622.0A7.10000-38.00000-37.00000F0Yellow/White
B7.400001960

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