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Xi2 Lupi, HD142630, HIP78106, HR5926

Xi2 Lupi is a blue main sequence dwarf star that can be located in the constellation of Lupus. The description is based on the spectral class. Xi2 Lupi is not part of the constellation but is within the borders of the constellation.

The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Xi2 Lupi's Alternative Names

Xi2 Lupi (Ksi02 Lup) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5926. HIP78106 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD142630.

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

Location of Xi2 Lupi

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 Xi2 Lupi, the location is 15h 56m 54.11 and -33° 57` 51.0 .

Radial Velocity and Proper Motion of Xi2 Lupi

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 -43.29 ± 2.05 miliarcseconds/year towards the north and 23.56 ± 4.70 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 the Sun is -12.20 km/s with an error of about 1.78 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of Xi2 Lupi

Xi2 Lupi has a spectral type of B9V. This means the star is a blue main sequence dwarf star. The star is 7,347.00 Parsecs from the Galactic Centre or terms of Light Years is 23,963.22 s. The star has a B-V Colour Index of 0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,718 Kelvin.

Xi2 Lupi Radius has been calculated as being 1.87 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,301,779.45.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 1.44. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Xi2 Lupi Apparent and Absolute Magnitudes

Xi2 Lupi has an apparent magnitude of 5.59 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 1.70 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.27. 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 Xi2 Lupi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.64 which gave the calculated distance to Xi2 Lupi as 196.01 light years away from Earth or 60.10 parsecs. It would take a spaceship travelling at the speed of light, 196.01 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 21.71 which put Xi2 Lupi at a distance of 150.24 light years or 46.06 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 7,347.00 Parsecs or 23,963.22 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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Xi2 Lupi Facts

Visual Facts


Primary / Proper / Traditional NameXi2 Lupi
Alternative NamesKsi02 Lup, HD 142630, HIP 78106, HR 5926
Spectral TypeB9V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationLupus
Absolute Magnitude 1.70 / 2.27
Visual / Apparent Magnitude5.59
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 56m 54.11
Declination (Dec.)-33° 57` 51.0
Galactic Latitude14.75 degrees
Galactic Longitude341.30 degrees
1997 Distance from Earth16.64 Parallax (milliarcseconds)
 196.01 Light Years
 60.10 Parsecs
2007 Distance from Earth21.71 Parallax (milliarcseconds)
 150.24 Light Years
 46.06 Parsecs
Galacto-Centric Distance23,963.22 Light Years / 7,347.00 Parsecs
Proper Motion Dec.-43.29 ± 2.05 milliarcseconds/year
Proper Motion RA.23.56 ± 4.70 milliarcseconds/year
B-V Index0.07
Radial Velocity-12.20 ± 1.78 km/s
Eccentricity0.11
Semi-Major Axis8215.00
Associated / Clustered StarsXi1 Lupi

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature8,718 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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