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Chi Carinae, HD65575, HIP38827, HR3117

Chi Carinae is a blue subgiant star that can be located in the constellation of Carina. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Chi Carinae's Alternative Names

Chi Carinae (Chi Car) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR3117. HIP38827 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD65575.

More details on star alternative names can be found at Star Names .

Location of Chi Carinae

The location of the star in the night sky 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 Chi Carinae, the location is 07h 56m 46.74 and -52° 58` 56.6 .

Proper Motion of Chi 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 19.71 ± 0.45 miliarcseconds/year towards the north and -28.68 ± 0.47 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 19.40000 km/s with an error of about 2.60 km/s .

Chi Carinae 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 2,266.18 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Chi Carinae

Chi Carinae has a spectral type of B3IVp. This means the star is a blue subgiant star. The star is 7,409.00 Parsecs from the Galactic Centre or terms of Light Years is 24,165.44 s. The star has a B-V Colour Index of -0.17 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 14,786 Kelvin.

Chi Carinae Radius has been calculated as being 3.43 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,386,190.86.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.03. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Chi Carinae Apparent and Absolute Magnitudes

Chi Carinae has an apparent magnitude of 3.46 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 -1.91 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.26. 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 Chi Carinae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.43 which gave the calculated distance to Chi Carinae as 386.91 light years away from Earth or 118.62 parsecs. It would take a spaceship travelling at the speed of light, 386.91 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 7.17 which put Chi Carinae at a distance of 454.90 light years or 139.47 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 7,409.00 Parsecs or 24,165.44 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

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Chi Carinae Facts

Visual Facts


Primary / Proper / Traditional NameChi Carinae
Alternative NamesChi Car, HD 65575, HIP 38827, HR 3117
Spectral TypeB3IVp
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue
GalaxyMilky Way
ConstellationCarina
Absolute Magnitude-1.91 / -2.26
Visual / Apparent Magnitude3.46
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 56m 46.74
Declination (Dec.)-52° 58` 56.6
Galactic Latitude-12.32 degrees
Galactic Longitude266.68 degrees
1997 Distance from Earth8.43 Parallax (milliarcseconds)
 386.91 Light Years
 118.62 Parsecs
2007 Distance from Earth7.17 Parallax (milliarcseconds)
 454.90 Light Years
 139.47 Parsecs
Galacto-Centric Distance24,165.44 Light Years / 7,409.00 Parsecs
Proper Motion Dec.19.71 ± 0.45 milliarcseconds/year
Proper Motion RA.-28.68 ± 0.47 milliarcseconds/year
B-V Index-0.17
Radial Velocity19.40 ± 2.60 km/s
Eccentricity0.02
Semi-Major Axis7366.00
Stellar Luminosity (Lsun)2,266.18

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature14,786 Kelvin

Sources and Links


SIMBAD SourceLink

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