The Gliese ID of the star is GL 791.2. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names
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 LHS 3556, the location is 20 29 48.3179167836 and +09 41 20.590506834 .
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 101.33 milliarcseconds/year towards the north and 669.34 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 -26.00 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.
LHS 3556 has a spectral type of M4.5V B. This means the star is a red main sequence star.
The Parallax of the star is given as 133.81 which gives a calculated distance to LHS 3556 of 24.37 light years from the Earth or 7.47 parsecs. It is about 143,262,100,344,484.33 miles from Earth.
The star is roughly 1,540,787.37 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.
A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).
If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 1,193,850,836,204.04 hours or 136,284,342.03 years.
At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to LHS 3556 then it would take 4,341,275,768.01 hours / 495,579.43 years to get there. Speed Ref: N.A.S.A.
It would to take a spaceship journey travelling at the speed of light, 24.37 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
|Primary / Proper / Traditional Name||LHS 3556|
|Alternative Names||, Gliese 791.2|
|Spectral Type||M4.5V B|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Main Sequence Dwarf Star|
|Right Ascension (R.A.)||20 29 48.3179167836|
|Declination (Dec.)||+09 41 20.590506834|
|Distance from Earth||133.81 Parallax (milliarcseconds)|
|24.37 Light Years|
|1,540,787.37 Astronomical Units|
|Proper Motion Dec.||101.33 milliarcseconds/year|
|Proper Motion RA.||669.34 milliarcseconds/year|
|Radial Velocity||-26.00 km/s|
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