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HD 153919

HD 153919 Facts

  • HD 153919 is a eclipsing binary sys variable star that can be located in the constellation of Scorpius. The description is based on the spectral class.
  • HD 153919 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (O5f) of the star, the star's colour is blue - 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 9060.09 light years away from us. Distance

HD 153919's Alternative Names

HIP83499 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD153919.

HD 153919 has alternative name(s) :- 4U 1700-37, V884 Sco, V884 Sco.

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

Location of HD 153919

The location of the variable 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 object is compared to the celestial equator and is expressed in degrees. For HD 153919, the location is 17h 03m 56.77 and -37 ° 50` 39.0 .

Radial Velocity and Proper Motion of HD 153919

Proper Motion

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 4.71 ± 0.28 milliarcseconds/year towards the north and 2.80 ± 0.57 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -75.00000 km/s with an error of about 7.40 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.

Physical Properties of HD 153919

HD 153919 Temperature and Colour

Based on the star's spectral type of O5f , HD 153919's colour and type is blue - white variable star. The star has a B-V Colour Index of 0.26 which means the star's temperature is about 6,999 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 153919 Radius

HD 153919 Apparent and Absolute Magnitudes

HD 153919 has an apparent magnitude of 6.48 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 -5.74. 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 HD 153919

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00000 which gave the calculated distance to HD 153919 as 0 light years away from Earth or 0 parsecs. If you want that in miles, it is about 0.00, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.36000 which put HD 153919 at a distance of 9060.09 light years or 2777.78 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 572,954,261.10 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.

Travel Time to HD 153919

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking41,518,961,753,559.15
Car12050,632,058,451.97
Airbus A3807368,255,226,921.52
Speed of Sound (Mach 1)767.2697,918,796,425.03
Concorde (Mach 2)1,534.543,959,393,052.14
New Horizons Probe33,000184,116,576.19
Speed of Light670,616,629.009,060.09

Variable Type of HD 153919

The star is a eclipsing binary sys Beta Lyrae (Sheliak) 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. HD 153919 brightness ranges from a magnitude of 6.621 to a magnitude of 6.547 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.4 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 HD 153919 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 153919
Alternative Names4U 1700-37, V884 Sco, HD 153919, HIP 83499, V884 Sco
Spectral TypeO5f
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourBlue
GalaxyMilky Way
ConstellationScorpius
Absolute Magnitude / -5.74
Visual / Apparent Magnitude6.48
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 03m 56.77
Declination (Dec.)-37 ° 50` 39.0
Galactic Latitude2.17348414 degrees
Galactic Longitude347.75441033 degrees
1997 Distance from Earth0.00000 Parallax (milliarcseconds)
 0 Light Years
 0 Parsecs
2007 Distance from Earth0.36000 Parallax (milliarcseconds)
 9060.09 Light Years
 2777.78 Parsecs
 572,954,261.10 Astronomical Units
Proper Motion Dec.4.71000 ± 0.28000 milliarcseconds/year
Proper Motion RA.2.80000 ± 0.57000 milliarcseconds/year
B-V Index0.26
Radial Velocity-75.00000 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days3.411
Variable Magnitude Range (Brighter - Dimmer)6.547 - 6.621

Estimated Calculated Facts


Effective Temperature6,999 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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