IC 2944 CloseUp

IC 2944 (also known improperly as the Lambda Centauri Nebula, sometimes indicated by the acronym C 100) is an H II region of the southern Milky Way visible in the constellation Centaurus; its distance is approximately 2000 parsecs (6500 light years) and is part of the Sagittarius Arm, the closest spiral arm of the Milky Way located more internally than ours.

The best-known feature of this cloud is the presence of some dark cocoons, known as Thackeray globules; due to their instability, there would be no active star formation phenomena inside them, while their origin is due to the disintegrating action of the radiation of the massive stars present in the region, which over time has eroded an ancient molecular cloud.

The galactic environment in which this cloud finds itself is among the most complex known among the spiral arms of the Milky Way: within a radius of just 500 parsecs from it there are in fact some of the most conspicuous stellar and nebulous objects in the southern sky; among these stands out the Carina Nebula, the massive clusters Tr 14 and Tr 16, as well as the brilliant cluster NGC 4755, the famous Chest of Joys, visible in the constellation of the Southern Cross, plus other brilliant OB associations.