Universe Guide


Delta Pictoris - HD42933 - HIP29276

Delta Pictoris is a blue eclipsing subgiant star that can be located in the constellation of Pictor. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Delta Pictoris is the Bayer Classification for the star. HIP29276 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD42933.

Delta Pictoris has alternative name(s), del_Pic.

Location of Delta Pictoris

The location of the star in the galaxy 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 Delta Pictoris, the location is 06h 10m 17.91 and -54d58`07.2 .

Proper Motion of Delta Pictoris

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 7.41 ± 0.13 miliarcseconds/year towards the north and -4.90 ± 0.15 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Delta Pictoris

Delta Pictoris has a spectral type of B0.5IV. This means the star is a blue subgiant star. The star is 7451.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24302.4307614400000000s. The star has a B-V Colour Index of -0.22 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 18,854 Kelvin.

Delta Pictoris Radius has been calculated as being 5.06 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,520,612.52.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.96. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Delta Pictoris Apparent and Absolute Magnitudes

Delta Pictoris has an apparent magnitude of 4.72 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 -3.81 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.28. 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 Delta Pictoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.97 which gave the calculated distance to Delta Pictoris as 1655.65 light years away from Earth or 507.61 parsecs. It would take a spaceship travelling at the speed of light, 1655.65 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 2.51 which put Delta Pictoris at a distance of 1299.46 light years or 398.41 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 7,451.00 Parsecs or 24,302.43 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 Delta Pictoris

The star is a eclipsing Beta Lyrae (Sheliak)/Detached System (subtype) 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. Delta Pictoris brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.0 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.

Delta Pictoris Facts

Alternative Names

Short Namedel Pic
Bayer DesignationDelta Pictoris
Hipparcos Library I.D.29276
Henry Draper Designation42933

Visual Facts

Star Typesubgiant star
Absolute Magnitude-3.81 / -3.28
Visual / Apparent Magnitude4.72
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)06h 10m 17.91
Declination (Dec.)-54d58`07.2
Galactic Latitude-27.68 degrees
Galactic Longitude263.30 degrees
1997 Distance from Earth1.97 Parallax (milliarcseconds)
 1655.65 Light Years
 507.61 Parsecs
2007 Revised Distance from Earth2.51 Parallax (milliarcseconds)
 1299.46 Light Years
 398.41 Parsecs
Galacto-Centric Distance24,302.43 Light Years / 7,451.00 Parsecs
Proper Motion Dec.7.41 ± 0.13 milliarcseconds/year
Proper Motion RA.-4.90 ± 0.15 milliarcseconds/year
B-V Index-0.22
Radial Velocity30.60 ± 2.80 km/s
Spectral TypeB0.5IV
Colour(B) blue

Variable Star Details

Variable Star ClassEclipsing
Variable Star TypeBeta Lyrae (Sheliak)/Detached System (subtype) probably
Mean Variability Period in Days2.000

Estimated Facts

Calculated Effective Temperature18,854 Kelvin

Sources and Links

SIMBAD SourceLink

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