Universe Guide


V345 Carinae, HD78764, HIP44626

V345 Carinae is a blue eruptive subgiant star that can be located in the constellation of Carina. V345 Carinae is the 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.

HIP44626 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD78764.

V345 Carinae has alternative name(s), V345 Car.

Location of V345 Carinae

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 V345 Carinae, the location is 09h 05m 38.38 and -70d32`18.7 .

Proper Motion of V345 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 8.87 ± 0.33 miliarcseconds/year towards the north and -4.11 ± 0.38 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V345 Carinae

V345 Carinae has a spectral type of B2IVe. This means the star is a blue subgiant star. The star is 7327.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23897.9882148800000000s. The star has a B-V Colour Index of -0.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 13,196 Kelvin.

V345 Carinae Radius has been calculated as being 6.92 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,814,288.14.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 6.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V345 Carinae Apparent and Absolute Magnitudes

V345 Carinae has an apparent magnitude of 4.66 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 -2.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.70. 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 V345 Carinae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.02 which gave the calculated distance to V345 Carinae as 1080.01 light years away from Earth or 331.13 parsecs. It would take a spaceship travelling at the speed of light, 1080.01 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 3.37 which put V345 Carinae at a distance of 967.84 light years or 296.74 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 7,327.00 Parsecs or 23,897.99 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 V345 Carinae

The star is a eruptive Gamma Cassiopeiae 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. V345 Carinae brightness ranges from a magnitude of 4.653 to a magnitude of 4.576 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 137.7 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.

V345 Carinae Facts

Alternative Names

Traditional/Proper NameV345 Carinae
Short NameV345 Car
Hipparcos Library I.D.44626
Henry Draper Designation78764

Visual Facts

Star Typesubgiant star
Absolute Magnitude-2.94 / -2.70
Visual / Apparent Magnitude4.66
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)09h 05m 38.38
Declination (Dec.)-70d32`18.7
Galactic Latitude-15.43 degrees
Galactic Longitude286.19 degrees
1997 Distance from Earth3.02 Parallax (milliarcseconds)
 1080.01 Light Years
 331.13 Parsecs
2007 Revised Distance from Earth3.37 Parallax (milliarcseconds)
 967.84 Light Years
 296.74 Parsecs
Galacto-Centric Distance23,897.99 Light Years / 7,327.00 Parsecs
Proper Motion Dec.8.87 ± 0.33 milliarcseconds/year
Proper Motion RA.-4.11 ± 0.38 milliarcseconds/year
B-V Index-0.14
Radial Velocity19.00 ± 7.40 km/s
Spectral TypeB2IVe
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days137.700
Variable Magnitude Range (Brighter - Dimmer)4.576 - 4.653

Estimated Facts

Calculated Effective Temperature13,196 Kelvin

Sources and Links

SIMBAD SourceLink

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