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DQ Andromedae

DQ Andromedae Facts

DQ Andromedae's Alternative Names

HIP4639 is the reference name for the star in the Hipparcos Star Catalogue.

DQ Andromedae has alternative name(s) :- DQ And, DQ And.

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

Location of DQ Andromedae

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 DQ Andromedae, the location is 00h 59m 34.47 and +45° 24` 24.2 .

Radial Velocity and Proper Motion of DQ Andromedae

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 1.92 ± 1.98 milliarcseconds/year towards the north and 5.16 ± 3.01 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 -231.00 km/s with an error of about 999.00 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 (Colour, Temperature) of DQ Andromedae

DQ Andromedae Colour and Temperature

DQ Andromedae has a spectral type of K-M. This means the star is a orange to red variable star. The star has a B-V Colour Index of 0 which means the star's temperature is about 10,293 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

DQ Andromedae Radius

Radius has been calculated as being 0.42 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 292,592.00.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.90. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

DQ Andromedae Apparent and Absolute Magnitudes

DQ Andromedae has an apparent magnitude of 11.82 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 4.22 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.95. 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 DQ Andromedae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.02 which gave the calculated distance to DQ Andromedae as 1080.01 light years away from Earth or 331.13 parsecs. If you want that in miles, it is 724,272,665,486.

In 2007, Hipparcos data was revised with a new parallax of 0.67 which put DQ Andromedae at a distance of 4868.11 light years or 1492.54 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 307,856,328.74 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 DQ Andromedae

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)
Walking4816,158,879,450.30
Car12027,205,295,981.68
Airbus A3807364,435,646,083.97
Speed of Sound (Mach 1)767.2694,254,877,386.94
Concorde (Mach 2)1,534.542,127,435,920.73
New Horizons Probe33,00098,928,349.02
Speed of Light670,616,629.004,868.11
DQ Andromedae brightness ranges from a magnitude of 12.207 to a magnitude of 11.367 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.2 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 DQ Andromedae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameDQ Andromedae
Alternative NamesDQ And, HIP 4639, DQ And
Spectral TypeK-M
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
ConstellationAndromeda
Absolute Magnitude 4.22 / 0.95
Visual / Apparent Magnitude11.82
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)00h 59m 34.47
Declination (Dec.)+45° 24` 24.2
Galactic Latitude-17.44 degrees
Galactic Longitude124.43 degrees
1997 Distance from Earth3.02 Parallax (milliarcseconds)
 1080.01 Light Years
 331.13 Parsecs
2007 Distance from Earth0.67 Parallax (milliarcseconds)
 4868.11 Light Years
 1492.54 Parsecs
 307,856,328.74 Astronomical Units
Proper Motion Dec.1.92 ± 1.98 milliarcseconds/year
Proper Motion RA.5.16 ± 3.01 milliarcseconds/year
B-V Index0.00
Radial Velocity-231.00 ± 999.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days3.201
Variable Magnitude Range (Brighter - Dimmer)11.367 - 12.207

Estimated Calculated Facts


Radius (x the Sun)1.90
Effective Temperature10,293 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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