Universe Guide

13 Sagittae - HD189577 - HIP98438

13 Sagittae is a red pulsating giant star that can be located in the constellation of Sagitta. 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. 13 Sagittae has alternative name(s), 13 Sagittae.

Location of 13 Sagittae

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 13 Sagittae, the location is 20h 00m 03.31 and +17 d 30 ` 59.5 .

Physical Properties/View of 13 Sagittae

13 Sagittae has a spectral type of M4IIIa. This means the star is (M) red coloured (III) giant. 13 Sagittae lies at a distance of 746.37 light years away from our Sun and our planet Earth or to put it another way, 228.72 parsecs away from the Sun.

13 Sagittae has an apparent magnitude of 5.33 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 13 Sagittae has an absolute magnitude of -1.47 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 2400 and 3700 based on the Class Type and lookup at Wikipedia-Stellar Classification

Variable Type of 13 Sagittae

The star is a pulsating Slow Irregular 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. 13 Sagittae brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

13 Sagittae Facts


Traditional Name13 Sagittae
Short NameVZ Sge
Alternative Name(s)13 Sagittae
Hipparcos Library I.D.98438
Henry Draper Designation189577
Celestial TypeStar
Absolute Magnitude-1.47
Apparent Magnitude5.33
Right Ascension (R.A.)20h 00m 03.31
Declination (Dec.)+17 d 30 ` 59.5
Distance from the Sun / Earth746.37 Light Years
Spectral TypeM4IIIa
Colour (M) red
Star Type (III) giant.
Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Variable Magnitude Range (Brighter - Dimmer)5.000 - 5.000
Calculated Temperature Range2,400.00 - 3,700.00


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