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BF Aurigae

BF Aurigae Facts

  • BF Aurigae is a eclipsing binary sys main sequence star that can be located in the constellation of Auriga. The description is based on the spectral class.
  • BF Aurigae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B5V SB) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 163081.67 light years away from us. Distance

BF Aurigae's Alternative Names

HIP23657 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32419.

BF Aurigae has alternative name(s) :- BF Aur, BF Aur.

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+41 1051.

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

Location of BF Aurigae

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 BF Aurigae, the location is 05h 05m 03.50 and +41° 17` 19.1 .

Physical Properties of BF Aurigae

BF Aurigae Colour and Temperature

Based on the star's spectral type of B5V SB , BF Aurigae's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.02 which means the star's temperature is about 9,839 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BF Aurigae Radius

BF Aurigae estimated radius has been calculated as being 274.85 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 191,240,885.72.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.

BF Aurigae Apparent and Absolute Magnitudes

BF Aurigae has an apparent magnitude of 8.83 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 -9.66 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 BF Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.02000 which gave the calculated distance to BF Aurigae as 163081.67 light years away from Earth or 50000 parsecs. If you want that in miles, it is about 958,696,043,163,156,335.43, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to BF Aurigae

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)
Walking427,341,319,946,772.61
Car120911,377,331,559.09
Airbus A380736148,594,130,145.50
Speed of Sound (Mach 1)767.269142,538,379,352.08
Concorde (Mach 2)1,534.5471,269,096,789.32
New Horizons Probe33,0003,314,099,387.49
Speed of Light670,616,629.00163,081.67

Variable Type of BF Aurigae

The star is a eclipsing binary sys Beta Lyrae (Sheliak) 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. BF Aurigae brightness ranges from a magnitude of 9.462 to a magnitude of 8.759 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.6 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 BF Aurigae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBF Aurigae
Alternative NamesBF Aur, HD 32419, HIP 23657, BD+41 1051, BF Aur
Spectral TypeB5V SB
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationAuriga
Absolute Magnitude -9.66
Visual / Apparent Magnitude8.83
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 05m 03.50
Declination (Dec.)+41° 17` 19.1
Galactic Latitude0.08619261 degrees
Galactic Longitude165.14530725 degrees
Distance from Earth0.02000 Parallax (milliarcseconds)
 163081.67 Light Years
 50000 Parsecs
 10,313,168,449.20 Astronomical Units
B-V Index-0.02
Radial Velocity10.00000 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days1.583
Variable Magnitude Range (Brighter - Dimmer)8.759 - 9.462

Estimated Calculated Facts


Radius (x the Sun)274.85
Effective Temperature9,839 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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