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Tau8 Serpentis (26 Serpentis)

Tau8 Serpentis Facts

Tau8 Serpentis's Alternative Names

Tau8 Serpentis (Tau08 Ser) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5858. HIP77111 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD140729.

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 26 Serpentis with it shortened to 26 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+17 2906.

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

Location of Tau8 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 Tau8 Serpentis, the location is 15h 44m 42.15 and +17° 15` 51.2 .

Radial Velocity and Proper Motion of Tau8 Serpentis

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 5.02 ± 0.38 miliarcseconds/year towards the north and -29.59 ± 0.49 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -5.20 km/s with an error of about 4.30 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.

Tau8 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 43.83 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 Tau8 Serpentis

Tau8 Serpentis has a spectral type of A0V. This means the star is a blue main sequence star. The star is 7,335.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,924.08 s. The star has a B-V Colour Index of 0 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,531 Kelvin.

Tau8 Serpentis Radius has been calculated as being 1.99 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,383,882.78.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 2.29. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Tau8 Serpentis Apparent and Absolute Magnitudes

Tau8 Serpentis has an apparent magnitude of 6.15 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 1.18 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.87. 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 Tau8 Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.16 which gave the calculated distance to Tau8 Serpentis as 321.03 light years away from Earth or 98.43 parsecs. It would take a spaceship travelling at the speed of light, 321.03 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 8.80 which put Tau8 Serpentis at a distance of 370.64 light years or 113.64 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 23,439,769.25 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 7,335.00 Parsecs or 23,924.08 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 Tau8 Serpentis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameTau8 Serpentis
Alternative NamesTau08 Ser, HD 140729, HIP 77111, HR 5858, 26 Serpentis, 26 Ser, BD+17 2906
Spectral TypeA0V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationSerpens
Absolute Magnitude 1.18 / 0.87
Visual / Apparent Magnitude6.15
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 44m 42.15
Declination (Dec.)+17° 15` 51.2
Galactic Latitude48.91 degrees
Galactic Longitude28.33 degrees
1997 Distance from Earth10.16 Parallax (milliarcseconds)
 321.03 Light Years
 98.43 Parsecs
2007 Distance from Earth8.80 Parallax (milliarcseconds)
 370.64 Light Years
 113.64 Parsecs
 23,439,769.25 Astronomical Units
Galacto-Centric Distance23,924.08 Light Years / 7,335.00 Parsecs
Proper Motion Dec.5.02 ± 0.38 milliarcseconds/year
Proper Motion RA.-29.59 ± 0.49 milliarcseconds/year
B-V Index0.00
Radial Velocity-5.20 ± 4.30 km/s
Eccentricity0.04
Semi-Major Axis7665.00
Stellar Luminosity (Lsun)43.83
Associated / Clustered StarsTau1 Serpentis
Tau2 Serpentis
Tau3 Serpentis
Tau4 Serpentis
Tau5 Serpentis
Tau6 Serpentis

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)2.29
Effective Temperature9,531 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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