BBC Sky at Night Magazine

3 Acrab (Beta (`) Scorpii)

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Take the opportunit­y to observe these stars when they are highest in the sky at your location, because while, at 13.7 arcseconds, they may be an easy pair to split, they don’t rise very high in the sky at northerly latitudes.

Acrab is a B0-type star located in a star-filled region of Scorpius near the plane of our Galaxy. It is one of the brighter stars in the northernmo­st claw of the Scorpion. Beginning with Antares, the brightest star in the body of the Scorpion, move 7.5° northwest to mag. +2.3 Delta Scorpii. This is the middle star in a 6.5° line of mag. +2.0 stars orientated nearly north-south. Acrab is the northernmo­st star in this line, about 3° north-northeast of Delta Scorpii. It is actually the tip of the northern claw.

The main component is a B1 spectral class star that appears warm white at 62x magnificat­ion. The fainter component is a B2 class star that appears pale blue-green at moderate (62x) and higher powers (200x).

 ??  ?? Acrab (Beta (`) Scorpii) Magnitudes +2.6 and +4.5 Separation 13.7”
Acrab (Beta (`) Scorpii) Magnitudes +2.6 and +4.5 Separation 13.7”

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