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ER Carinae, HD97082, HIP54543

ER Carinae is a white to yellow pulsating supergiant 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.

ER Carinae's Alternative Names

HIP54543 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD97082.

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

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

Location of ER 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 ER Carinae, the location is 11h 09m 41.15 and -58° 50` 15.8 .

Radial Velocity and Proper Motion of ER 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 2.66 ± 0.49 miliarcseconds/year towards the north and -9.01 ± 0.65 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 the Sun is -18.10 km/s with an error of about 3.00 km/s . 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 ER Carinae

ER Carinae has a spectral type of G1Iab/Ib. This means the star is a white to yellow supergiant star. The star has a B-V Colour Index of 0.83 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,353 Kelvin.

ER Carinae Radius has been calculated as being 34.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,334,267.62.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 36.12. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.13 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

ER Carinae Apparent and Absolute Magnitudes

ER Carinae has an apparent magnitude of 6.79 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 -2.54 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.61. 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 ER Carinae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.36 which gave the calculated distance to ER Carinae as 2398.26 light years away from Earth or 735.29 parsecs. It would take a spaceship travelling at the speed of light, 2398.26 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 1.32 which put ER Carinae at a distance of 2470.93 light years or 757.58 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 ER 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. ER Carinae brightness ranges from a magnitude of 7.298 to a magnitude of 6.689 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 7.7 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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ER Carinae Facts

Visual Facts


Primary / Proper / Traditional NameER Carinae
Alternative NamesHD 97082, HIP 54543, ER Car
Spectral TypeG1Iab/Ib
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationCarina
Absolute Magnitude-2.54 / -2.61
Visual / Apparent Magnitude6.79
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)11h 09m 41.15
Declination (Dec.)-58° 50` 15.8
Galactic Latitude1.47 degrees
Galactic Longitude290.09 degrees
1997 Distance from Earth1.36 Parallax (milliarcseconds)
 2398.26 Light Years
 735.29 Parsecs
2007 Distance from Earth1.32 Parallax (milliarcseconds)
 2470.93 Light Years
 757.58 Parsecs
Proper Motion Dec.2.66 ± 0.49 milliarcseconds/year
Proper Motion RA.-9.01 ± 0.65 milliarcseconds/year
B-V Index0.83
Radial Velocity-18.10 ± 3.00 km/s
Iron Abundance0.13 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days7.719
Variable Magnitude Range (Brighter - Dimmer)6.689 - 7.298

Estimated Facts


Calculated Effective Temperature5,353 Kelvin

Sources and Links


SIMBAD SourceLink

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