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DL Crucis, HD106343, HIP59678

DL Crucis is a blue pulsating supergiant star that can be located in the constellation of Crux. 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.

DL Crucis's Alternative Names

HIP59678 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD106343.

DL Crucis has alternative name(s) :- , DL Cru.

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

Location of DL Crucis

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 DL Crucis, the location is 12h 14m 16.93 and -64° 24` 30.7 .

Proper Motion of DL Crucis

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 0.15 ± 0.28 miliarcseconds/year towards the north and -5.62 ± 0.38 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 -10.50000 km/s with an error of about 1.60 km/s .

Physical Properties (Colour, Temperature) of DL Crucis

DL Crucis has a spectral type of B1.5Ia. This means the star is a blue supergiant star. 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 8,878 Kelvin.

DL Crucis Apparent and Absolute Magnitudes

DL Crucis has an apparent magnitude of 6.20 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.64. 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 DL Crucis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.16 which gave the calculated distance to DL Crucis as -20385.21 light years away from Earth or -6250 parsecs. It would take a spaceship travelling at the speed of light, -20385.21 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 0.68 which put DL Crucis at a distance of 4796.52 light years or 1470.59 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 DL Crucis

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. DL Crucis brightness ranges from a magnitude of 6.279 to a magnitude of 6.243 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.9 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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DL Crucis Facts

Visual Facts

Primary / Proper / Traditional NameDL Crucis
Alternative NamesHD 106343, HIP 59678, DL Cru
Spectral TypeB1.5Ia
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
Visual / Apparent Magnitude6.20
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 14m 16.93
Declination (Dec.)-64° 24` 30.7
Galactic Latitude-1.83 degrees
Galactic Longitude298.93 degrees
1997 Distance from Earth-0.16 Parallax (milliarcseconds)
 -20385.21 Light Years
 -6250 Parsecs
2007 Distance from Earth0.68 Parallax (milliarcseconds)
 4796.52 Light Years
 1470.59 Parsecs
Proper Motion Dec.0.15 ± 0.28 milliarcseconds/year
Proper Motion RA.-5.62 ± 0.38 milliarcseconds/year
B-V Index0.07
Radial Velocity-10.50 ± 1.60 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 Days2.878
Variable Magnitude Range (Brighter - Dimmer)6.243 - 6.279

Estimated Facts

Calculated Effective Temperature8,878 Kelvin

Sources and Links

SIMBAD SourceLink

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