Universe Guide

ER Carinae

ER Carinae Facts

  • ER Carinae is a pulsating supergiant star that can be located in the constellation of Carina. The description is based on the spectral class.
  • ER Carinae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G1Iab/Ib) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2470.93 light years away from us. Distance

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, ER Car.

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

Location of ER Carinae

The location of the supergiant 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 object 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

Proper Motion

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 milliarcseconds/year towards the north and -9.01 ± 0.65 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -18.10000 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 of ER Carinae

ER Carinae Colour and Temperature

Based on the star's spectral type of G1Iab/Ib , ER Carinae's colour and type is yellow supergiant star. The star has a B-V Colour Index of 0.83 which means the star's temperature is about 5,353 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

ER Carinae Radius

ER Carinae estimated 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 36.118902277420875383109129771. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

ER Carinae Iron Abundance

ER Carinae 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. The value comes from the Hipparcos Extended Catalog.

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 1.36000 which gave the calculated distance to ER Carinae as 2398.26 light years away from Earth or 735.29 parsecs. If you want that in miles, it is about 14,098,472,087,491,324.52, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.32000 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.

Using the 2007 distance, the star is roughly 156,261,003.07 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.

Travel Time to ER Carinae

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807362,251,422,210.73
Speed of Sound (Mach 1)767.2692,159,668,573.99
Concorde (Mach 2)1,534.541,079,832,879.62
New Horizons Probe33,00050,213,537.79
Speed of Light670,616,629.002,470.93

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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Additional ER Carinae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameER Carinae
Alternative NamesER Car, HD 97082, HIP 54543, ER Car
Spectral TypeG1Iab/Ib
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star less luminour Supergiant Star
GalaxyMilky Way
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 Latitude1.47266362 degrees
Galactic Longitude290.08530553 degrees
1997 Distance from Earth1.36000 Parallax (milliarcseconds)
 2398.26 Light Years
 735.29 Parsecs
2007 Distance from Earth1.32000 Parallax (milliarcseconds)
 2470.93 Light Years
 757.58 Parsecs
 156,261,003.07 Astronomical Units
Proper Motion Dec.2.66000 ± 0.49000 milliarcseconds/year
Proper Motion RA. -9.01000 ± 0.65000 milliarcseconds/year
B-V Index0.83
Radial Velocity-18.10000 ± 3.00 km/s
Iron Abundance0.1300 ± 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 Calculated Facts

Radius (x the Sun)36.12
Effective Temperature5,353 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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