Y Andromedae is a red pulsating star that can be located in the constellation of Andromeda. The description is based on the spectral class. Y Andromedae is not part of the constellation but is within the borders of the constellation.
The Id of the star in the Henry Draper catalogue is HD10112.
More details on star alternative names can be found at Star Names .
The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Y Andromedae, the location is 01h 39m 36.887 and +39° 20` 34.96 .
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 2.80 miliarcseconds/year towards the north and -1.40 miliarcseconds/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 -7.00 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.
Y Andromedae has a spectral type of M3-4.5e. This means the star is a red star.
The star is a pulsating Omicron Ceti 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.
|Primary / Proper / Traditional Name||Y Andromedae|
|Alternative Names||HD 10112|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Right Ascension (R.A.)||01h 39m 36.887|
|Declination (Dec.)||+39° 20` 34.96|
|Proper Motion Dec.||2.80 milliarcseconds/year|
|Proper Motion RA.||-1.40 milliarcseconds/year|
|Radial Velocity||-7.00 km/s|
|Variable Star Class||Pulsating|
|Variable Star Type||Omicron Ceti|