Universe Guide


Avior, Epsilon Carinae, HD71129, HIP41037, HR3307

Avior (Epsilon Carinae) is a orange to red eclipsing binary system main sequence dwarf star that can be located in the constellation of Carina. Avior is the 40th brightest star in the night sky and the 4th brightest star in Carina based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Epsilon Carinae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR3307. HIP41037 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD71129.

Avior has alternative name(s), NSV 04058.

Location of Avior

The location of the star in the galaxy 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 Avior, the location is 08h 22m 30.86 and -59d30`34.3 .

Proper Motion of Avior

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 22.06 ± 0.41 miliarcseconds/year towards the north and -25.52 ± 0.42 miliarcseconds/year east if we saw them in the horizon.

Avior Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 58.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Avior

Avior has a spectral type of K3III+B2V. This means the star is a orange to red main sequence dwarf star. The star is 7389.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24100.2094881600000000s. The star has a B-V Colour Index of 1.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,507 Kelvin.

Avior Radius has been calculated as being 126.23 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 87,832,992.26.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 120.55. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Avior Apparent and Absolute Magnitudes

Avior has an apparent magnitude of 1.86 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 -4.58 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.48. 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 Avior

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.16 which gave the calculated distance to Avior as 632.10 light years away from Earth or 193.80 parsecs. It would take a spaceship travelling at the speed of light, 632.10 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 5.39 which put Avior at a distance of 605.13 light years or 185.53 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.

The star's Galacto-Centric Distance is 7,389.00 Parsecs or 24,100.21 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of Avior

The star is a eclipsing binary system Eclipsing 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. Avior brightness ranges from a magnitude of 2.040 to a magnitude of 1.960 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

Avior Facts

Alternative Names

Traditional/Proper NameAvior
Short NameNSV 04058
Bayer DesignationEpsilon Carinae
Hipparcos Library I.D.41037
Yale Bright Star Catalogue (HR) Id3307
Henry Draper Designation71129

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-4.58 / -4.48
Visual / Apparent Magnitude1.86
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 22m 30.86
Declination (Dec.)-59d30`34.3
Galactic Latitude-12.60 degrees
Galactic Longitude274.29 degrees
1997 Distance from Earth5.16 Parallax (milliarcseconds)
 632.10 Light Years
 193.80 Parsecs
2007 Revised Distance from Earth5.39 Parallax (milliarcseconds)
 605.13 Light Years
 185.53 Parsecs
Galacto-Centric Distance24,100.21 Light Years / 7,389.00 Parsecs
Proper Motion Dec.22.06 ± 0.41 milliarcseconds/year
Proper Motion RA.-25.52 ± 0.42 milliarcseconds/year
B-V Index1.19
Radial Velocity11.60 ± 0.50 km/s
Spectral TypeK3III+B2V
Brightest in Night Sky40th
Colour(K) Orange to Red

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeEclipsing probably
Mean Variability Period in Days0.057
Variable Magnitude Range (Brighter - Dimmer)1.960 - 2.040

Estimated Facts

Luminosity (x the Sun)58.0000000
Calculated Effective Temperature4,507 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
71129-59 1032.4A2.20000-25.0000023.00000K0Orange

Location of Avior in Carina

Avior (Epsilon Carinae) Location in Carina

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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