Universe Guide

BF Serpentis

BF Serpentis Facts

  • BF Serpentis is a variable star that can be located in the constellation of Serpens. The description is based on the spectral class.
  • BF Serpentis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A9.5) of the star, the star's colour is blue - white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -1622.70 light years away from us. Distance

BF Serpentis's Alternative Names

HIP74739 is the reference name for the star in the Hipparcos Star Catalogue.

BF Serpentis has alternative name(s) :- BF Ser, BF Ser.

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

Location of BF Serpentis

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 BF Serpentis, the location is 15h 16m 28.51 and +16° 26` 39.8 .

Physical Properties of BF Serpentis

BF Serpentis Colour and Temperature

Based on the star's spectral type of A9.5 , BF Serpentis's colour and type is blue - white variable star. Based on the star's spectral, the stars temperature is between 7,500.00 and 10,000.00 degrees kelvin.

BF Serpentis Iron Abundance

BF Serpentis Iron Abundance is -2.41 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.

BF Serpentis Apparent and Absolute Magnitudes

BF Serpentis has an apparent magnitude of 12.37 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 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 Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.01000 which gave the calculated distance to BF Serpentis as -1622.70 light years away from Earth or -497.51 parsecs. If you want that in miles, it is about -9,539,245,393,065,043.95, based on 1 Ly = 5,878,625,373,183.61 miles.

BF Serpentis brightness ranges from a magnitude of 12.836 to a magnitude of 11.144 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.2 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 BF Serpentis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBF Serpentis
Alternative NamesBF Ser, HIP 74739, BF Ser
Spectral TypeA9.5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Visual / Apparent Magnitude12.37
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)15h 16m 28.51
Declination (Dec.)+16° 26` 39.8
Galactic Latitude54.82212630 degrees
Galactic Longitude22.86544116 degrees
Distance from Earth-2.01000 Parallax (milliarcseconds)
 -1622.70 Light Years
 -497.51 Parsecs
 -102,618,088.70 Astronomical Units
B-V Index-99
Radial Velocity-175.00000 ± 10.00 km/s
Iron Abundance-2.4100 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days1.165
Variable Magnitude Range (Brighter - Dimmer)11.144 - 12.836

Estimated Calculated Facts

Calculated Temperature Range7,500.00 - 10,000.00

Sources and Links

SIMBAD SourceLink

Related Stars

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