Universe Guide


V346 Orionis, HD287841, HIP25299

V346 Orionis is a blue eruptive giant star that can be located in the constellation of Orion. The star can not be seen by the naked eye, you need a telescope to see it.

HIP25299 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD287841.

V346 Orionis has alternative name(s), V346 Ori.

Location of V346 Orionis

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 V346 Orionis, the location is 05h 24m 42.80 and +01d43`48.3 .

Proper Motion of V346 Orionis

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 0.31 ± 0.89 miliarcseconds/year towards the north and -0.02 ± 2.01 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V346 Orionis

V346 Orionis has a spectral type of A5III:var. This means the star is a blue giant star. The star is 7703.00000000 Parsecs from the Galactic Centre or terms of Light Years is 25124.3623883200000000s. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,827 Kelvin.

V346 Orionis Radius has been calculated as being 2.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,071,027.06.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.23. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V346 Orionis Apparent and Absolute Magnitudes

V346 Orionis has an apparent magnitude of 10.21 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 1.16 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.79. 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 V346 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.55 which gave the calculated distance to V346 Orionis as 2104.28 light years away from Earth or 645.16 parsecs. It would take a spaceship travelling at the speed of light, 2104.28 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 2.07 which put V346 Orionis at a distance of 1575.67 light years or 483.09 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 7,703.00 Parsecs or 25,124.36 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 V346 Orionis

The star is a eruptive Irregular 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. V346 Orionis brightness ranges from a magnitude of 10.351 to a magnitude of 10.211 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.

V346 Orionis Facts

Alternative Names

Traditional/Proper NameV346 Orionis
Short NameV346 Ori
Hipparcos Library I.D.25299
Henry Draper Designation287841

Visual Facts

Star Typegiant star
Absolute Magnitude1.16 / 1.79
Visual / Apparent Magnitude10.21
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)05h 24m 42.80
Declination (Dec.)+01d43`48.3
Galactic Latitude-18.35 degrees
Galactic Longitude201.06 degrees
1997 Distance from Earth1.55 Parallax (milliarcseconds)
 2104.28 Light Years
 645.16 Parsecs
2007 Revised Distance from Earth2.07 Parallax (milliarcseconds)
 1575.67 Light Years
 483.09 Parsecs
Galacto-Centric Distance25,124.36 Light Years / 7,703.00 Parsecs
Proper Motion Dec.0.31 ± 0.89 milliarcseconds/year
Proper Motion RA.-0.02 ± 2.01 milliarcseconds/year
B-V Index0.19
Spectral TypeA5III:var
Colour(A) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.099
Variable Magnitude Range (Brighter - Dimmer)10.211 - 10.351

Estimated Facts

Calculated Effective Temperature7,827 Kelvin

Sources and Links

SIMBAD SourceLink

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