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. The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -19.60000 km/s with an error of about 0.10 km/s. The star is moving -142.73 ± 0.12 milliarcseconds/year towards the north and -47.54 ± 0.16 milliarcseconds/year east if we saw them in the horizon.
Proper Motion details the movements of these stars and are measured in milliarcseconds. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. In the case of a star, its the galactic centre. Yed Prior Radial Velocity and Proper Motion Yed Prior Proper MotionĪll stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. 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 star has a traditional/proper name of Yed Prior which means in English - The Preceding One Of 'The Hand'.Using the most recent figures given by the 2007 Hipparcos data, Yed Prior distance from Earth is 171.12 light years.Yed Prior is a Binary or Multiple star system.The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.Based on the spectral type (M1 III) of the star, the Yed Prior colour is red.Yed Prior is a main star in the constellation Ophiuchus and makes up the constellation outline.Normally, the brightest star in the constellation is classified as Alpha. Yed Prior is the traditional/proper name for the star whilst Delta Ophiuchi is the Bayer classification for the star.
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