Universe Guide

Delta Orionis A

Delta Orionis A Facts

Location of Delta Orionis A

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 Delta Orionis A, the location is 05 32 00.398 and -00 17 56.69 .

Proper Motion of Delta Orionis A

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 0.60 milliarcseconds/year towards the north and 1.70 milliarcseconds/year east if we saw them in the horizon. . 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.

Physical Properties (Colour) of Delta Orionis A

Delta Orionis A Colour and Temperature

Delta Orionis A has a spectral type of O9.5II+B1V+B0IV C. This means the star is a blue - white subgiant star.

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Additional Delta Orionis A Facts and Figures

Visual Facts

Primary / Proper / Traditional NameDelta Orionis A
Spectral TypeO9.5II+B1V+B0IV C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
GalaxyMilky Way
Right Ascension (R.A.)05 32 00.398
Declination (Dec.)-00 17 56.69
Proper Motion Dec.0.60 milliarcseconds/year
Proper Motion RA.1.70 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Sources and Links


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