Scorpius OB1 region

The Scorpius OB1 region is a large nebular region of the Milky Way located on the Sagittarius Arm in the direction of the constellation Scorpius, where significant star formation phenomena have generated dozens of high-mass stars grouped into an extensive OB association.

The core of the association is easily visible with binoculars and even to the naked eye, coinciding with the young open cluster NGC 6231; surrounding it are other massive stars and a large number of low- and intermediate-mass stars, only a small fraction of which have likely been discovered and observed. These lower-mass stars generally appear older than their massive counterparts and may result from an earlier wave of star formation in the region.

Scorpius OB1 is surrounded by substantial amounts of gas and dust, much of it ionized, visible as H II regions cataloged as IC 4628 and Gum 55.

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