Universe Guide

10 Hydrae - HD74591 - HIP42931

10 Hydrae is a blue main sequence dwarf star that can be located in the constellation of Hydra. HIP is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD. The Id of the star in the Gould Star Catalogue is . 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 Hydrae has alternative name(s), 10 Hydrae.

Location of 10 Hydrae

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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 10 Hydrae, the location is 08h 45m 01.28 and +05 d 40 ` 50.1 .

Physical Properties/View of 10 Hydrae

10 Hydrae has a spectral type of A6V. This means the star is (A) blue coloured (V) main sequence (dwarf star). 10 Hydrae lies at a distance of 206.69 light years away from our Sun and our planet Earth or to put it another way, 63.16 parsecs away from the Sun.

10 Hydrae has an apparent magnitude of 6.13 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 10 Hydrae has an absolute magnitude of 2.12 which is the apparent magnitude of an object if it were 32.6 light years away or 10 parsecs from Earth. 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. The stars temperature has been calculated at between 7500 and 10000 based on the Class Type and lookup at Wikipedia-Stellar Classification

Source of Information

The source of the information came 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.

10 Hydrae Facts


Traditional Name10 Hydrae
Alternative Name(s)10 Hydrae
Hipparcos Library I.D.42931
Gould I.D.52
Henry Draper Designation74591
Celestial TypeStar
Absolute Magnitude2.12
Apparent Magnitude6.13
Right Ascension (R.A.)08h 45m 01.28
Declination (Dec.)+05 d 40 ` 50.1
Distance from the Sun / Earth206.69 Light Years
Spectral TypeA6V
Colour (A) blue
Star Type (IV) subgiant.
Variable Star ClassConstant, non-variable
Calculated Temperature Range7,500.00 - 10,000.00


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