(Mu Draconis A) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.
The Id of the star in the Yale Bright Star Catalogue is HR6370. The Id of the star in the Henry Draper catalogue is HD154906. The Gliese ID of the star is GJ 9584. The star was added to the Gliese catalogue in 1970 by Richard van der Riet Woolley hence the GJ prefix rather than GL prefix.Star Names.
Alrakis has alternative name(s) :- Mu Dra A.
More details on objects' alternative names can be found at Star Names .
The location of the main sequence 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 Alrakis, the location is 17h 05m 20.114 and +54° 28` 12.26 .
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 88.70 milliarcseconds/year towards the north and -68.40 milliarcseconds/year east if we saw them in the horizon.
The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -15.40 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.
Alrakis has a spectral type of F6V C. This means the star is a blue to white main sequence star.
|Primary / Proper / Traditional Name||Alrakis|
|Alternative Names||Mu Draconis A, Mu Dra A, HD 154906, HR 6370, Gliese 9584|
|Spectral Type||F6V C|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Main Sequence Dwarf Star|
|Colour||Yellow - White|
|Right Ascension (R.A.)||17h 05m 20.114|
|Declination (Dec.)||+54° 28` 12.26|
|Proper Motion Dec.||88.70 milliarcseconds/year|
|Proper Motion RA.||-68.40 milliarcseconds/year|
|Radial Velocity||-15.40 km/s|
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