(Sigma Orionis E) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.
The Id of the star in the Yale Bright Star Catalogue is HR1932. The Id of the star in the Henry Draper catalogue is HD37479.
Sigma Orionis E has alternative name(s) :- Sigma Ori E.
BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-02 1327.
More details on objects' alternative names can be found at Star Names .
The location of the subgiant 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 Sigma Orionis E, the location is 05d 38m 47.198 and -02° 35` 40.54 .
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 -3.00 milliarcseconds/year towards the north and -1.50 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 29.00 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.
Sigma Orionis E has a spectral type of B2IV-Vp_He C. This means the star is a blue subgiant star.
|Primary / Proper / Traditional Name||Sigma Orionis E|
|Alternative Names||Sigma Ori E, HD 37479, HR 1932, BD-02 1327|
|Spectral Type||B2IV-Vp_He C|
|Constellation's Main Star||No|
|Multiple Star System||Yes|
|Star Type||Subgiant Star|
|Right Ascension (R.A.)||05d 38m 47.198|
|Declination (Dec.)||-02° 35` 40.54|
|Proper Motion Dec.||-3.00 milliarcseconds/year|
|Proper Motion RA.||-1.50 milliarcseconds/year|
|Radial Velocity||29.00 km/s|
|Associated / Clustered Stars||Sigma Orionis|
Sigma Orionis C
Sigma Orionis D
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