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XZ Horolgii, HIP13575

XZ Horolgii is a red pulsating variable star that can be located in the constellation of Horologium. The description is based on the spectral class. XZ Horolgii is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

XZ Horolgii's Alternative Names

HIP13575 is the reference name for the star in the Hipparcos Star Catalogue.

XZ Horolgii has alternative name(s) :- , XZ Hor.

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

Location of XZ Horolgii

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 XZ Horolgii, the location is 02h 54m 52.73 and -51° 57` 13.3 .

Proper Motion of XZ Horolgii

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 -3.00 ± 0.47 miliarcseconds/year towards the north and -1.62 ± 0.56 miliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of XZ Horolgii

XZ Horolgii has a spectral type of M0. This means the star is a red variable star. The star has a B-V Colour Index of 1.68 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,528 Kelvin.

XZ Horolgii Apparent and Absolute Magnitudes

XZ Horolgii has an apparent magnitude of 8.77 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.95. 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 XZ Horolgii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.07 which gave the calculated distance to XZ Horolgii as -46594.76 light years away from Earth or -14285.71 parsecs. It would take a spaceship travelling at the speed of light, -46594.76 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 1.14 which put XZ Horolgii at a distance of 2861.08 light years or 877.19 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.

Using the 2007 distance, the star is roughly 180,932,164.64 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Variable Type of XZ Horolgii

The star is a pulsating Omicron Ceti 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. XZ Horolgii brightness ranges from a magnitude of 8.906 to a magnitude of 8.725 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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XZ Horolgii Facts

Visual Facts

Primary / Proper / Traditional NameXZ Horolgii
Alternative NamesHIP 13575, XZ Hor
Spectral TypeM0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
Absolute Magnitude / -0.95
Visual / Apparent Magnitude8.77
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 54m 52.73
Declination (Dec.)-51° 57` 13.3
Galactic Latitude-56.09 degrees
Galactic Longitude268.41 degrees
1997 Distance from Earth-0.07 Parallax (milliarcseconds)
 -46594.76 Light Years
 -14285.71 Parsecs
2007 Distance from Earth1.14 Parallax (milliarcseconds)
 2861.08 Light Years
 877.19 Parsecs
 180,932,164.64 Astronomical Units
Proper Motion Dec.-3.00 ± 0.47 milliarcseconds/year
Proper Motion RA.-1.62 ± 0.56 milliarcseconds/year
B-V Index1.68

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days0.150
Variable Magnitude Range (Brighter - Dimmer)8.725 - 8.906

Estimated Facts

Calculated Effective Temperature3,528 Kelvin

Sources and Links

SIMBAD SourceLink

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