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Beta Serpentis (28 Serpentis) Star Facts

Beta Serpentis Facts

Beta Serpentis's Alternative Names

Beta Serpentis (Bet Ser) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR5867. HIP77233 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD141003.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 28 Serpentis with it shortened to 28 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+15 2911.

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

Location of Beta Serpentis

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 Beta Serpentis, the location is 15h 46m 11.21 and +15° 25` 18.9 .

Radial Velocity and Proper Motion of Beta Serpentis

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 -38.61 ± 0.19 milliarcseconds/year towards the north and 65.38 ± 0.26 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 0.60 km/s with an error of about 0.30 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.

Beta Serpentis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 68.51 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Beta Serpentis

Beta Serpentis Colour and Temperature

Beta Serpentis has a spectral type of A3V. This means the star is a blue - white main sequence star. The star has a B-V Colour Index of 0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,718 Kelvin.

Beta Serpentis Radius

Radius has been calculated as being 3.58 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,492,018.45.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 3.63. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.20 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

Beta Serpentis Apparent and Absolute Magnitudes

Beta Serpentis has an apparent magnitude of 3.65 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 0.29 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.26. 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 Beta Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 21.31 which gave the calculated distance to Beta Serpentis as 153.06 light years away from Earth or 46.93 parsecs. It would take a spaceship travelling at the speed of light, 153.06 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 21.03 which put Beta Serpentis at a distance of 155.09 light years or 47.55 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 9,807,823.20 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 7,371.00 Parsecs or 24,041.50 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 Beta Serpentis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBeta Serpentis
Alternative NamesBet Ser, HD 141003, HIP 77233, HR 5867, 28 Serpentis, 28 Ser, BD+15 2911
Spectral TypeA3V
Constellation's Main StarYes
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationSerpens
Absolute Magnitude 0.29 / 0.26
Visual / Apparent Magnitude3.65
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 46m 11.21
Declination (Dec.)+15° 25` 18.9
Galactic Latitude47.87 degrees
Galactic Longitude25.98 degrees
1997 Distance from Earth21.31 Parallax (milliarcseconds)
 153.06 Light Years
 46.93 Parsecs
2007 Distance from Earth21.03 Parallax (milliarcseconds)
 155.09 Light Years
 47.55 Parsecs
 9,807,823.20 Astronomical Units
Galacto-Centric Distance24,041.50 Light Years / 7,371.00 Parsecs
Proper Motion Dec.-38.61 ± 0.19 milliarcseconds/year
Proper Motion RA.65.38 ± 0.26 milliarcseconds/year
B-V Index0.07
Radial Velocity0.60 ± 0.30 km/s
Iron Abundance-0.20 ± 0.04 Fe/H
Eccentricity0.22
Semi-Major Axis8878.00
Stellar Luminosity (Lsun)68.51

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)3.63
Effective Temperature8,718 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
141003+15 2911.0A3.7000068.00000-49.00000A2White
B9.90000-69.00000-58.000001832
C10.700001960

Serpens Main Stars


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