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LN Velorum, HD74371, HIP42679, HR3456

LN Velorum is a blue pulsating supergiant star that can be located in the constellation of Vela. 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.

LN Velorum's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR3456. HIP42679 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD74371.

LN Velorum has alternative name(s) :- , LN Vel.

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

Location of LN Velorum

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 LN Velorum, the location is 08h 41m 56.91 and -45° 24` 38.6 .

Proper Motion of LN Velorum

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 4.92 ± 0.17 miliarcseconds/year towards the north and -5.21 ± 0.22 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 24.20000 km/s with an error of about 2.40 km/s .

Physical Properties (Colour, Temperature) of LN Velorum

LN Velorum has a spectral type of B5Iab. This means the star is a blue supergiant star. 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 7,653 Kelvin.

LN Velorum Radius has been calculated as being 40.11 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 27,910,492.66.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 112.54. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

LN Velorum Apparent and Absolute Magnitudes

LN Velorum has an apparent magnitude of 5.20 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 -4.39 If you used the 2007 Parallax value, you would get an absolute magnitude of -6.63. 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 LN Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.21 which gave the calculated distance to LN Velorum as 2695.56 light years away from Earth or 826.45 parsecs. It would take a spaceship travelling at the speed of light, 2695.56 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 0.43 which put LN Velorum at a distance of 7585.19 light years or 2325.58 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 LN Velorum

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. LN Velorum brightness ranges from a magnitude of 5.298 to a magnitude of 5.224 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.

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LN Velorum Facts

Visual Facts

Primary / Proper / Traditional NameLN Velorum
Alternative NamesHD 74371, HIP 42679, HR 3456, LN Vel
Spectral TypeB5Iab
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
Absolute Magnitude-4.39 / -6.63
Visual / Apparent Magnitude5.20
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 41m 56.91
Declination (Dec.)-45° 24` 38.6
Galactic Latitude-2.01 degrees
Galactic Longitude264.44 degrees
1997 Distance from Earth1.21 Parallax (milliarcseconds)
 2695.56 Light Years
 826.45 Parsecs
2007 Distance from Earth0.43 Parallax (milliarcseconds)
 7585.19 Light Years
 2325.58 Parsecs
Proper Motion Dec.4.92 ± 0.17 milliarcseconds/year
Proper Motion RA.-5.21 ± 0.22 milliarcseconds/year
B-V Index0.17
Radial Velocity24.20 ± 2.40 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days0.070
Variable Magnitude Range (Brighter - Dimmer)5.224 - 5.298

Estimated Facts

Calculated Effective Temperature7,653 Kelvin

Sources and Links

SIMBAD SourceLink

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