V478 Hydrae is a white to yellow rotating main sequence dwarf star that can be located in the constellation of Hydra. The description is based on the spectral class. V478 Hydrae 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 HD70573.
V478 Hydrae has alternative name(s) :- V378 Hya.
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 V478 Hydrae, the location is 08 22 49.9528448767 and +01 51 33.554224835 .
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 -49.19 miliarcseconds/year towards the north and -51.43 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 20.46 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.
V478 Hydrae has a spectral type of G1/2V. This means the star is a white to yellow main sequence dwarf star.
The Parallax of the star is given as 16.87 which gives a calculated distance to V478 Hydrae of 193.36 light years from the Earth or 59.28 parsecs. It would take a spaceship travelling at the speed of light, 193.36 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is roughly 12,227,292.51 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.
The star is a rotating BY Draconis 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||V478 Hydrae|
|Alternative Names||V378 Hya, HD 70573|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||main sequence Dwarf Star|
|Colour||white to yellow|
|Right Ascension (R.A.)||08 22 49.9528448767|
|Declination (Dec.)||+01 51 33.554224835|
|Distance from Earth||16.87 Parallax (milliarcseconds)|
|193.36 Light Years|
|12,227,292.51 Astronomical Units|
|Proper Motion Dec.||-49.19 milliarcseconds/year|
|Proper Motion RA.||-51.43 milliarcseconds/year|
|Radial Velocity||20.46 km/s|
|Variable Star Class||Rotating|
|Variable Star Type||BY Draconis|