Universe Guide

Campbell's Star (Wolf-Rayet Star) Facts

Campbell's Star Facts

  • Campbell's Star is a eclipsing binary sys wolf-rayet star that can be located in the constellation of Cygnus. The description is based on the spectral class.
  • Campbell's Star is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 16308.17 light years away from us. Distance

Campbell's Star's Alternative Names

HIP96295 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD184738.

Campbell's Star has alternative name(s) :- , V1966 Cyg.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+30 3639.

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

Location of Campbell's Star

The location of the wolf-rayet 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 Campbell's Star, the location is 19h 34m 45.24 and +30° 30` 59.0 .

Radial Velocity and Proper Motion of Campbell's Star

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 -9.21 ± 1.62 milliarcseconds/year towards the north and -4.08 ± 2.32 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 -30.40000 km/s with an error of about 3.30 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 Campbell's Star

Campbell's Star Temperature and Colour

Based on the star's spectral type of WC... The star has a B-V Colour Index of -0.01 which means the star's temperature is about 10,551 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Campbell's Star Radius

Campbell's Star Apparent and Absolute Magnitudes

Campbell's Star has an apparent magnitude of 10.00 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 -3.49. 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 Campbell's Star

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.63000 which gave the calculated distance to Campbell's Star as -2001.00 light years away from Earth or -613.50 parsecs. If you want that in miles, it is about -11,763,129,371,740,403.61, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.20000 which put Campbell's Star at a distance of 16308.17 light years or 5000 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 1,031,316,844.92 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 Campbell's Star

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)
Airbus A38073614,859,415,748.04
Speed of Sound (Mach 1)767.26914,253,840,557.30
Concorde (Mach 2)1,534.547,126,910,989.98
New Horizons Probe33,000331,409,999.71
Speed of Light670,616,629.0016,308.17

Variable Type of Campbell's Star

The star is a eclipsing binary sys Eclipsing 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. Campbell's Star brightness ranges from a magnitude of 9.534 to a magnitude of 9.423 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 Campbell's Star Facts and Figures

Visual Facts

Primary / Proper / Traditional NameCampbell's Star
Alternative NamesHD 184738, HIP 96295, BD+30 3639, V1966 Cyg
Spectral TypeWC...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeWolf-Rayet star
GalaxyMilky Way
Absolute Magnitude / -3.49
Visual / Apparent Magnitude10.00
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)19h 34m 45.24
Declination (Dec.)+30° 30` 59.0
Galactic Latitude5.01941541 degrees
Galactic Longitude64.78542953 degrees
1997 Distance from Earth-1.63000 Parallax (milliarcseconds)
 -2001.00 Light Years
 -613.50 Parsecs
2007 Distance from Earth0.20000 Parallax (milliarcseconds)
 16308.17 Light Years
 5000 Parsecs
 1,031,316,844.92 Astronomical Units
Proper Motion Dec.-9.21000 ± 1.62000 milliarcseconds/year
Proper Motion RA.-4.08000 ± 2.32000 milliarcseconds/year
B-V Index-0.01
Radial Velocity-30.40000 ± 3.30 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEclipsing binary sys
Variable Star TypeEclipsing
Mean Variability Period in Days0.059
Variable Magnitude Range (Brighter - Dimmer)9.423 - 9.534

Estimated Calculated Facts

Effective Temperature10,551 Kelvin

Sources and Links

SIMBAD SourceLink

Location of Campbell's Star in Cygnus

Campbell's Star Location in Cygnus

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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Comments and Questions

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