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UX Carinae, HD91039, HIP51338

UX Carinae is a blue to white pulsating luminous giant star that can be located in the constellation of Carina. 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.

UX Carinae's Alternative Names

HIP51338 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD91039.

UX Carinae has alternative name(s) :- , UX Car.

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

Location of UX Carinae

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 UX Carinae, the location is 10h 29m 11.25 and -57 ° 36` 48.3 .

Proper Motion of UX Carinae

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 0.96 ± 0.80 miliarcseconds/year towards the north and -6.06 ± 1.04 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 10.40000 km/s with an error of about 3.10 km/s .

Physical Properties (Colour, Temperature) of UX Carinae

UX Carinae has a spectral type of F2II. This means the star is a blue to white luminous giant star. The star has a B-V Colour Index of 0.68 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,694 Kelvin.

UX Carinae Apparent and Absolute Magnitudes

UX Carinae has an apparent magnitude of 8.26 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 -1.19. 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 UX Carinae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00 which gave the calculated distance to UX Carinae as -1 light years away from Earth or -1 parsecs. It would take a spaceship travelling at the speed of light, -1 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 1.29 which put UX Carinae at a distance of 2528.40 light years or 775.19 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.

Variable Type of UX Carinae

The star is a pulsating Delta Cepheid 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. UX Carinae brightness ranges from a magnitude of 8.776 to a magnitude of 7.908 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.7 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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UX Carinae Facts

Visual Facts


Primary / Proper / Traditional NameUX Carinae
Alternative NamesHD 91039, HIP 51338, UX Car
Spectral TypeF2II
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
Colour blue to white
GalaxyMilky Way
ConstellationCarina
Visual / Apparent Magnitude8.26
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 29m 11.25
Declination (Dec.)-57 ° 36` 48.3
Galactic Latitude0.16 degrees
Galactic Longitude284.78 degrees
1997 Distance from Earth0.00 Parallax (milliarcseconds)
 -1 Light Years
 -1 Parsecs
2007 Distance from Earth1.29 Parallax (milliarcseconds)
 2528.40 Light Years
 775.19 Parsecs
Proper Motion Dec.0.96 ± 0.80 milliarcseconds/year
Proper Motion RA.-6.06 ± 1.04 milliarcseconds/year
B-V Index0.68
Radial Velocity10.40 ± 3.10 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days3.682
Variable Magnitude Range (Brighter - Dimmer)7.908 - 8.776

Estimated Facts


Calculated Effective Temperature5,694 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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