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Chi2 Orionis - HD41117 - HIP28716

Chi2 Orionis is a blue pulsating very luminous supergiant star that can be located in the constellation of Orion. Chi2 Orionis is the Bayer Classification for the star. HIP28716 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD41117. Chi2 Orionis has alternative name(s), 62 Orionis , chi02_Ori, 62 Ori.

Location of Chi2 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 Chi2 Orionis, the location is 06h 03m 55.18 and +20d08`18.5 .

Proper Motion of Chi2 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 -002.10 ± 000.15 towards the north and 001.88 ± 000.28 east if we saw them in the horizon.

Chi2 Orionis 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 220000.0000000 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 Chi2 Orionis

Chi2 Orionis has a spectral type of B2Iavar. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.23 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,184 Kelvin.

Chi2 Orionis has been calculated as 711.66 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 495,172,927.48.km.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, Chi1 Orionis.

Chi2 Orionis Apparent and Absolute Magnitudes

Chi2 Orionis has an apparent magnitude of 4.64 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 -10.36 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.07. 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 Chi2 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.10 which gave the calculated distance to Chi2 Orionis as 32616.33 light years away from Earth or 10000 parsecs. It would take a spaceship travelling at the speed of light, 32616.33 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 1.81 which put Chi2 Orionis at a distance of 1802.01 light years or 552.49 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 Chi2 Orionis

The star is a pulsating Alpha Cygnus 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. Chi2 Orionis brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Chi2 Orionis Facts

Alternative Names

Short Namechi02 Ori, 62 Ori
Bayer DesignationChi2 Orionis
Alternative Name(s)62 Orionis
Hipparcos Library I.D.28716
Bonner DurchmusterungBD+20 1233
Henry Draper Designation41117

Visual Facts

Star Typesupergiant star
Absolute Magnitude-10.36 / -4.07
Apparent Magnitude4.64
Right Ascension (R.A.)06h 03m 55.18
Declination (Dec.)+20d08`18.5
1997 Distance from Earth0.10 Parallax (milliarcseconds)
 32616.33 Light Years
 10000 Parsecs
2007 Revised Distance from Earth1.81 Parallax (milliarcseconds)
 1802.01 Light Years
 552.49 Parsecs
Proper Motion Dec.-2.10 ± 0.15 milliarcseconds/year
Proper Motion RA.1.88 ± 0.28 milliarcseconds/year
B-V Index0.23
Spectral TypeB2Iavar
Colour(B) blue

Companions (Multi-Star and Exoplanets) Facts

Companion StarsChi1 Orionis

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days3.000

Estimated Facts

Radius (x the Sun)711.66
Luminosity (x the Sun)220,000.0000000
Calculated Effective Temperature7,184 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Chi2 Orionis in Orion


Chi2 Orionis (Chi2 Orionis) Location in Orion

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


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