The Id of the star in the Henry Draper catalogue is HD23631.
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 Melotte 22, the location is 03h 47m 24.4131955559 and +23° 54` 52.829427881 .
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 -44.33 miliarcseconds/year towards the north and 20.54 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 3.00 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.
Melotte 22 has a spectral type of A0V C. This means the star is a blue main sequence star.
The Parallax of the star is given as 7.20 which gives a calculated distance to Melotte 22 of 453.27 light years from the Earth or 138.97 parsecs. It would take a spaceship travelling at the speed of light, 453.27 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is roughly 28,664,420.39 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.
|Primary / Proper / Traditional Name||Melotte 22|
|Alternative Names||HD 23631|
|Spectral Type||A0V C|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||main sequence Dwarf Star|
|Right Ascension (R.A.)||03h 47m 24.4131955559|
|Declination (Dec.)||+23° 54` 52.829427881|
|Distance from Earth||7.20 Parallax (milliarcseconds)|
|453.27 Light Years|
|28,664,420.39 Astronomical Units|
|Proper Motion Dec.||-44.33 milliarcseconds/year|
|Proper Motion RA.||20.54 milliarcseconds/year|
|Radial Velocity||3.00 km/s|
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