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CQ Camelopardalis, HD20797, HIP15890

CQ Camelopardalis is a red eruptive luminous giant star that can be located in the constellation of Camelopardalis. CQ Camelopardalis is the brightest star in Camelopardalis based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP15890 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD20797.

CQ Camelopardalis has alternative name(s), CQ Cam.

Location of CQ Camelopardalis

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 CQ Camelopardalis, the location is 03h 24m 40.56 and +64d 35` 09.6 .

Proper Motion of CQ Camelopardalis

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 -0.87 ± 0.24 miliarcseconds/year towards the north and -2.86 ± 0.34 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of CQ Camelopardalis

CQ Camelopardalis has a spectral type of M0II. This means the star is a red luminous giant star. The star has a B-V Colour Index of 2.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 1,631 Kelvin.

CQ Camelopardalis Radius has been calculated as being 422.69 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 294,108,312.32.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 691.88. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.17 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

CQ Camelopardalis Apparent and Absolute Magnitudes

CQ Camelopardalis has an apparent magnitude of 5.13 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 -2.79 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.86. 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 CQ Camelopardalis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.61 which gave the calculated distance to CQ Camelopardalis as 1249.67 light years away from Earth or 383.14 parsecs. It would take a spaceship travelling at the speed of light, 1249.67 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 1.59 which put CQ Camelopardalis at a distance of 2051.34 light years or 628.93 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 CQ Camelopardalis

The star is a eruptive Irregular 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. CQ Camelopardalis brightness ranges from a magnitude of 5.270 to a magnitude of 5.152 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.

CQ Camelopardalis Facts

Alternative Names

Traditional/Proper NameCQ Camelopardalis
Short NameCQ Cam
Hipparcos Library I.D.15890
Bonner DurchmusterungBD+64 391
Henry Draper Designation20797

Visual Facts

Star Typeluminous giant star
Absolute Magnitude-2.79 / -3.86
Visual / Apparent Magnitude5.13
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 24m 40.56
Declination (Dec.)+64d 35` 09.6
Galactic Latitude6.44 degrees
Galactic Longitude138.46 degrees
1997 Distance from Earth2.61 Parallax (milliarcseconds)
 1249.67 Light Years
 383.14 Parsecs
2007 Revised Distance from Earth1.59 Parallax (milliarcseconds)
 2051.34 Light Years
 628.93 Parsecs
Proper Motion Dec.-0.87 ± 0.24 milliarcseconds/year
Proper Motion RA.-2.86 ± 0.34 milliarcseconds/year
B-V Index2.03
Radial Velocity-22.20 ± 0.48 km/s
Iron Abundance0.17 ± 9.99 Fe/H
Spectral TypeM0II
Colour(M) Red

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.107
Variable Magnitude Range (Brighter - Dimmer)5.152 - 5.270

Estimated Facts

Calculated Effective Temperature1,631 Kelvin

Sources and Links

SIMBAD SourceLink

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