Universe Guide

101 Aquarii - HD221565 - HIP116247

101 Aquarii is a blue main sequence dwarf star that can be located in the constellation of Aquarius. 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. 101 Aquarii has alternative name(s), 101 Aquarii.

Location of 101 Aquarii

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 101 Aquarii, the location is 23h 33m 16.63 and -20 d 54`52.3 .

Physical Properties/View of 101 Aquarii

101 Aquarii has a spectral type of A0V. This means the star is (A) blue coloured (V) main sequence (dwarf star). 101 Aquarii lies at a distance of 320.40 light years away from our Sun and our planet Earth or to put it another way, 98.11 parsecs away from the Sun.

101 Aquarii has an apparent magnitude of 4.70 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 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.

101 Aquarii Facts


Traditional Name101 Aquarii
Alternative Name(s)101 Aquarii
Hipparcos Library I.D.116247
Gould I.D.244
Henry Draper Designation221565
Celestial TypeStar
Apparent Magnitude4.70
Right Ascension (R.A.)23h 33m 16.63
Declination (Dec.)-20 d 54`52.3
Distance from the Sun / Earth320.40 Light Years
Spectral TypeA0V
Colour (A) blue
Star Type (IV) subgiant.
Variable Star ClassConstant, non-variable
Calculated Temperature Range7,500.00 - 10,000.00


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