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WZ Hydrae, HIP50073

WZ Hydrae is a blue pulsating variable star that can be located in the constellation of Hydra. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

WZ Hydrae's Alternative Names

HIP50073 is the reference name for the star in the Hipparcos Star Catalogue.

WZ Hydrae has alternative name(s) :- , WZ Hya.

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-12 3114.

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

Location of WZ Hydrae

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For WZ Hydrae, the location is 10h 13m 24.13 and -13° 08` 17.2 .

Proper Motion of WZ Hydrae

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 -15.17 ± 1.58 miliarcseconds/year towards the north and -6.16 ± 2.72 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 304.00000 km/s with an error of about 2.80 km/s .

Physical Properties (Colour) of WZ Hydrae

WZ Hydrae has a spectral type of A2. This means the star is a blue variable star. The star's Iron Abundance is -1.32 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

WZ Hydrae Apparent and Absolute Magnitudes

WZ Hydrae has an apparent magnitude of 10.96 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 3.27 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.08. 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 WZ Hydrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.90 which gave the calculated distance to WZ Hydrae as 1124.70 light years away from Earth or 344.83 parsecs. It would take a spaceship travelling at the speed of light, 1124.70 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 0.62 which put WZ Hydrae at a distance of 5260.70 light years or 1612.90 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Variable Type of WZ Hydrae

The star is a pulsating RR Lyrae type with asymmetric light curves 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. WZ Hydrae brightness ranges from a magnitude of 11.405 to a magnitude of 10.451 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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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WZ Hydrae Facts

Visual Facts


Primary / Proper / Traditional NameWZ Hydrae
Alternative NamesHIP 50073, BD-12 3114, WZ Hya
Spectral TypeA2
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue
GalaxyMilky Way
ConstellationHydra
Absolute Magnitude3.27 / -0.08
Visual / Apparent Magnitude10.96
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)10h 13m 24.13
Declination (Dec.)-13° 08` 17.2
Galactic Latitude34.40 degrees
Galactic Longitude254.26 degrees
1997 Distance from Earth2.90 Parallax (milliarcseconds)
 1124.70 Light Years
 344.83 Parsecs
2007 Distance from Earth0.62 Parallax (milliarcseconds)
 5260.70 Light Years
 1612.90 Parsecs
Proper Motion Dec.-15.17 ± 1.58 milliarcseconds/year
Proper Motion RA.-6.16 ± 2.72 milliarcseconds/year
B-V Index-99.00
Radial Velocity304.00 ± 2.80 km/s
Iron Abundance-1.32 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with asymmetric light curves
Mean Variability Period in Days0.538
Variable Magnitude Range (Brighter - Dimmer)10.451 - 11.405

Sources and Links


SIMBAD SourceLink

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