The Id of the star in the Yale Bright Star Catalogue is HR6485.
More details on objects' alternative names can be found at Star Names .
The location of the giant 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 Rho Herculis A, the location is 17h 23m 40.972 and +37° 08` 45.33 .
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 9.20 milliarcseconds/year towards the north and -38.60 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 -21.00 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.
Rho Herculis A has a spectral type of B9.5III C. This means the star is a blue giant star.
|Primary / Proper / Traditional Name||Rho Herculis A|
|Alternative Names||HR 6485|
|Spectral Type||B9.5III C|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Giant Star|
|Right Ascension (R.A.)||17h 23m 40.972|
|Declination (Dec.)||+37° 08` 45.33|
|Proper Motion Dec.||9.20 milliarcseconds/year|
|Proper Motion RA.||-38.60 milliarcseconds/year|
|Radial Velocity||-21.00 km/s|
|Associated / Clustered Stars||Rho Herculis|
Rho Herculis B
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