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AH Velorum, HD68808, HIP40155, HR3232

Primary Facts on AH Velorum

  • AH Velorum's star type is pulsating variable star that can be located in the constellation of Vela. The description is based on the spectral class.
  • AH Velorum is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F7p) of the star, the star's colour is blue to white .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2452.36 light years away from us.

AH Velorum's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR3232. HIP40155 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD68808.

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

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

Location of AH 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 AH Velorum, the location is 08h 11m 59.97 and -46° 38` 39.7 .

Radial Velocity and Proper Motion of AH 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 7.42 ± 0.22 miliarcseconds/year towards the north and -4.08 ± 0.27 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 26.00 km/s with an error of about 2.90 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.

AH Velorum 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 929.98 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 AH Velorum

AH Velorum has a spectral type of F7p. This means the star is a blue to white variable star. The star is 7,472.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,370.93 s. The star has a B-V Colour Index of 0.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,829 Kelvin.

AH Velorum Radius has been calculated as being 28.82 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,055,069.22.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 48.28. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

AH Velorum Apparent and Absolute Magnitudes

AH Velorum has an apparent magnitude of 5.77 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 -2.49 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.61. 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 AH Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.23 which gave the calculated distance to AH Velorum as 1462.62 light years away from Earth or 448.43 parsecs. It would take a spaceship travelling at the speed of light, 1462.62 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 1.33 which put AH Velorum at a distance of 2452.36 light years or 751.88 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.

Using the 2007 distance, the star is roughly 155,085,301.87 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,472.00 Parsecs or 24,370.93 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 AH Velorum

The star is a pulsating Delta Cepheid 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. AH Velorum brightness ranges from a magnitude of 5.987 to a magnitude of 5.620 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 4.2 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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Additional AH Velorum Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAH Velorum
Alternative NamesAh Vel, HD 68808, HIP 40155, HR 3232, AH Vel
Spectral TypeF7p
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue to white
GalaxyMilky Way
ConstellationVela
Absolute Magnitude -2.49 / -3.61
Visual / Apparent Magnitude5.77
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 11m 59.97
Declination (Dec.)-46° 38` 39.7
Galactic Latitude-6.96 degrees
Galactic Longitude262.44 degrees
1997 Distance from Earth2.23 Parallax (milliarcseconds)
 1462.62 Light Years
 448.43 Parsecs
2007 Distance from Earth1.33 Parallax (milliarcseconds)
 2452.36 Light Years
 751.88 Parsecs
 155,085,301.87 Astronomical Units
Galacto-Centric Distance24,370.93 Light Years / 7,472.00 Parsecs
Proper Motion Dec.7.42 ± 0.22 milliarcseconds/year
Proper Motion RA.-4.08 ± 0.27 milliarcseconds/year
B-V Index0.62
Radial Velocity26.00 ± 2.90 km/s
Eccentricity0.07
Semi-Major Axis6962.00
Stellar Luminosity (Lsun)929.98

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days4.227
Variable Magnitude Range (Brighter - Dimmer)5.620 - 5.987

Estimated Facts


Calculated Effective Temperature5,829 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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