Universe Guide


10 Serpentis - HD137898 - HIP75761

10 Serpentis is a blue subgiant star that can be located in the constellation of Serpens. HIP75761 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD137898. The Id of the star in the Gould Star Catalogue is 13 Cap. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. 10 Serpentis has alternative name(s), 10 Serpentis , 10 Ser.

Location of 10 Serpentis

The location of the star in the galaxy 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 10 Serpentis, the location is 15h 28m 38.29 and +01d50`31.8 .

Proper Motion of 10 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 -034.31 ± 000.15 towards the north and -085.35 ± 000.31 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 10 Serpentis

10 Serpentis has a spectral type of A8IV. This means the star is a blue coloured subgiant star. The star has a B-V Colour Index of 0.24 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,538 Kelvin.

10 Serpentis has been calculated as 1.92 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,333,070.69.km.

10 Serpentis Apparent and Absolute Magnitudes

10 Serpentis has an apparent magnitude of 5.15 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 2.28 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.15. 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 10 Serpentis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 26.68 which gave the calculated distance to 10 Serpentis as 122.25 light years away from Earth or 37.48 parsecs. In 2007, Hipparcos data was revised with a new parallax of 25.16 which put 10 Serpentis at a distance of 129.64 light years or 39.75 parsecs.

It would take a spaceship travelling at the speed of light, 122.25 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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10 Serpentis Facts

Alternative Names

Traditional Name10 Serpentis
Short Name10 Ser
Alternative Name(s)10 Serpentis
Hipparcos Library I.D.75761
Bonner DurchmusterungBD+02 2965
Gould I.D.13 Cap
Henry Draper Designation137898

Visual Facts

Star Typesubgiant star
Absolute Magnitude2.28 / 2.15
Apparent Magnitude5.15
Right Ascension (R.A.)15h 28m 38.29
Declination (Dec.)+01d50`31.8
1997 Distance from Earth26.68 Parallax (milliarcseconds)
 122.25 Light Years
 37.48 Parsecs
2007 Distance from Earth25.16 Parallax (milliarcseconds)
 129.64 Light Years
 39.75 Parsecs
Proper Motion Dec.-34.31 ± 0.15 milliarcseconds/year
Proper Motion RA.-85.35 ± 0.31 milliarcseconds/year
B-V Index0.24
Spectral TypeA8IV
Colour(A) blue

Estimated Facts

Radius (x the Sun)1.92
Calculated Effective Temperature7,538 Kelvin

Sources and Links

SIMBAD SourceLink

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