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FZ Draconis

FZ Draconis Facts

FZ Draconis's Alternative Names

HIP77993 is the reference name for the star in the Hipparcos Star Catalogue.

FZ Draconis has alternative name(s) :- , FZ Dra.

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+58 1599.

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

Location of FZ Draconis

The location of the variable 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 FZ Draconis, the location is 15h 55m 37.74 and +57° 53` 30.7 .

Physical Properties (Colour, Temperature) of FZ Draconis

FZ Draconis has a spectral type of M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,719 Kelvin.

FZ Draconis Radius has been calculated as being 17.95 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 12,489,086.19.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FZ Draconis Apparent and Absolute Magnitudes

FZ Draconis has an apparent magnitude of 10.51 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 0.49 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 FZ Draconis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.99 which gave the calculated distance to FZ Draconis as 3294.58 light years away from Earth or 1010.10 parsecs. It would take a spaceship travelling at the speed of light, 3294.58 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. FZ Draconis brightness ranges from a magnitude of 10.684 to a magnitude of 10.493 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

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 FZ Draconis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFZ Draconis
Alternative NamesHIP 77993, BD+58 1599, FZ Dra
Spectral TypeM2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationDraco
Absolute Magnitude 0.49
Visual / Apparent Magnitude10.51
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)15h 55m 37.74
Declination (Dec.)+57° 53` 30.7
Galactic Latitude45.61 degrees
Galactic Longitude89.77 degrees
Distance from Earth0.99 Parallax (milliarcseconds)
 3294.58 Light Years
 1010.10 Parsecs
 208,346,629.01 Astronomical Units
B-V Index1.62

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.128
Variable Magnitude Range (Brighter - Dimmer)10.493 - 10.684

Estimated Calculated Facts


Radius (x the Sun)17.95
Effective Temperature3,719 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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