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VY Serpentis, HD138279, HIP75982

Primary Facts on VY Serpentis

  • VY Serpentis's star type is pulsating variable star that can be located in the constellation of Serpens. The description is based on the spectral class.
  • VY Serpentis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F4) of the star, the star's colour is blue to 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 -3397.53 light years away from us.

VY Serpentis's Alternative Names

HIP75982 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD138279.

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

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 2972.

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

Location of VY Serpentis

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For VY Serpentis, the location is 15h 31m 01.99 and +01° 41` 01.8 .

Physical Properties (Colour, Temperature) of VY Serpentis

VY Serpentis has a spectral type of F4. This means the star is a blue to white variable star. The star has a B-V Colour Index of 0.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,366 Kelvin. The star's Iron Abundance is -1.48 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

VY Serpentis Apparent and Absolute Magnitudes

VY Serpentis has an apparent magnitude of 9.98 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 VY Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.96 which gave the calculated distance to VY Serpentis as -3397.53 light years away from Earth or -1041.67 parsecs. It would take a spaceship travelling at the speed of light, -3397.53 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of VY Serpentis

The star is a pulsating RR Lyrae type with a 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. VY Serpentis brightness ranges from a magnitude of 10.526 to a magnitude of 9.839 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.7 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 VY Serpentis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameVY Serpentis
Alternative NamesHD 138279, HIP 75982, BD+02 2972, VY Ser
Spectral TypeF4
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue to white
GalaxyMilky Way
ConstellationSerpens
Visual / Apparent Magnitude9.98
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 31m 01.99
Declination (Dec.)+01° 41` 01.8
Galactic Latitude44.10 degrees
Galactic Longitude6.16 degrees
Distance from Earth-0.96 Parallax (milliarcseconds)
 -3397.53 Light Years
 -1041.67 Parsecs
 -214,858,363.57 Astronomical Units
B-V Index0.41
Radial Velocity-147.00 ± 2.00 km/s
Iron Abundance-1.48 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with a
Mean Variability Period in Days0.714
Variable Magnitude Range (Brighter - Dimmer)9.839 - 10.526

Estimated Facts


Calculated Effective Temperature6,366 Kelvin

Sources and Links


SIMBAD SourceLink

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