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OP Velorum, HD75149, HIP43082

OP Velorum is a blue 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.

OP Velorum's Alternative Names

HIP43082 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD75149.

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

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

Location of OP 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 OP Velorum, the location is 08h 46m 30.55 and -45° 54` 45.1 .

Proper Motion of OP 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 4.13 ± 0.16 miliarcseconds/year towards the north and -5.27 ± 0.20 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 26.30000 km/s with an error of about 2.40 km/s .

Physical Properties (Colour, Temperature) of OP Velorum

OP Velorum has a spectral type of B3Ia. 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.

OP Velorum Radius has been calculated as being 49.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 34,729,637.11.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 133.73. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

OP Velorum Apparent and Absolute Magnitudes

OP Velorum has an apparent magnitude of 5.43 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 -4.59 If you used the 2007 Parallax value, you would get an absolute magnitude of -6.73. 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 OP Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.99 which gave the calculated distance to OP Velorum as 3294.58 light years away from Earth or 1010.10 parsecs. It would take a spaceship travelling at the speed of light, 3294.58 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 0.37 which put OP Velorum at a distance of 8815.23 light years or 2702.70 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. OP Velorum brightness ranges from a magnitude of 5.547 to a magnitude of 5.496 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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OP Velorum Facts

Visual Facts


Primary / Proper / Traditional NameOP Velorum
Alternative NamesHD 75149, HIP 43082, OP Vel
Spectral TypeB3Ia
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationVela
Absolute Magnitude-4.59 / -6.73
Visual / Apparent Magnitude5.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 46m 30.55
Declination (Dec.)-45° 54` 45.1
Galactic Latitude-1.69 degrees
Galactic Longitude265.33 degrees
1997 Distance from Earth0.99 Parallax (milliarcseconds)
 3294.58 Light Years
 1010.10 Parsecs
2007 Distance from Earth0.37 Parallax (milliarcseconds)
 8815.23 Light Years
 2702.70 Parsecs
Proper Motion Dec.4.13 ± 0.16 milliarcseconds/year
Proper Motion RA.-5.27 ± 0.20 milliarcseconds/year
B-V Index0.23
Radial Velocity26.30 ± 2.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.048
Variable Magnitude Range (Brighter - Dimmer)5.496 - 5.547

Estimated Facts


Calculated Effective Temperature7,184 Kelvin

Sources and Links


SIMBAD SourceLink

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