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Z Octantis, HIP86836

Z Octantis is a pulsating variable star that can be located in the constellation of Octans. 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.

Z Octantis's Alternative Names

HIP86836 is the reference name for the star in the Hipparcos Star Catalogue.

Z Octantis has alternative name(s) :- , Z Oct.

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

Location of Z Octantis

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 Z Octantis, the location is 17h 44m 36.60 and -86° 29` 10.5 .

Proper Motion of Z Octantis

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 -15.51 ± 1.98 miliarcseconds/year towards the north and 4.07 ± 2.40 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.

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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Z Octantis Facts

Visual Facts


Primary / Proper / Traditional NameZ Octantis
Alternative NamesHIP 86836, Z Oct
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationOctans
Visual / Apparent Magnitude11.07
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)17h 44m 36.60
Declination (Dec.)-86° 29` 10.5
Galactic Latitude-26.07 degrees
Galactic Longitude306.68 degrees
1997 Distance from Earth-1.18 Parallax (milliarcseconds)
 -2764.10 Light Years
 -847.46 Parsecs
2007 Distance from Earth0.01 Parallax (milliarcseconds)
 326163.34 Light Years
 100000 Parsecs
Proper Motion Dec.-15.51 ± 1.98 milliarcseconds/year
Proper Motion RA.4.07 ± 2.40 milliarcseconds/year
B-V Index1.50

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days346.000
Variable Magnitude Range (Brighter - Dimmer)9.796 - 12.274

Sources and Links


SIMBAD SourceLink

Related Stars


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