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Chi2 Orionis, 62 Orionis, HD41117, HIP28716, HR2135

Chi2 Orionis is a blue pulsating star that can be located in the constellation of Orion. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Chi2 Orionis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR2135. 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), chi02 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 +20d 08` 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 -2.10 ± 0.15 miliarcseconds/year towards the north and 1.88 ± 0.28 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 16.80000 km/s with an error of about 0.90 km/s .

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 star. The star is 7930.00000000 Parsecs from the Galactic Centre or terms of Light Years is 25864.7531792000000000s. 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 Radius has been calculated as being 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. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 39.28. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.38 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

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.

The star's Galacto-Centric Distance is 7,930.00 Parsecs or 25,864.75 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 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 4.717 to a magnitude of 4.672 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.9 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.

Chi2 Orionis Facts

Alternative Names

Flamsteed Name62 Orionis
Flamsteed Short Name62 Ori
Short Namechi02 Ori
Bayer DesignationChi2 Orionis
Hipparcos Library I.D.28716
Yale Bright Star Catalogue (HR) Id2135
Bonner DurchmusterungBD+20 1233
Henry Draper Designation41117

Visual Facts

Star Type star
Absolute Magnitude-10.36 / -4.07
Visual / Apparent Magnitude4.64
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 03m 55.18
Declination (Dec.)+20d 08` 18.5
Galactic Latitude-0.86 degrees
Galactic Longitude189.69 degrees
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
Galacto-Centric Distance25,864.75 Light Years / 7,930.00 Parsecs
Proper Motion Dec.-2.10 ± 0.15 milliarcseconds/year
Proper Motion RA.1.88 ± 0.28 milliarcseconds/year
B-V Index0.23
Radial Velocity16.80 ± 0.90 km/s
Iron Abundance-0.38 ± 9.99 Fe/H
Spectral TypeB2Iavar
Associated / Clustered StarsChi1 Orionis
Colour(B) blue

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days2.868
Variable Magnitude Range (Brighter - Dimmer)4.672 - 4.717

Estimated Facts

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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