The HorseHead Nebula

The Sadr region, at 3000 light years away from us, is a diffuse emission nebulae named after the bright star Sadr that appears to be close to it but actually isn't. Sadr is sitting at 1800 light years away from us so is between us and the nebulous region. This is a massive star with 12 times the mass and 15 times the diameter of our sun.

4 Panel Mosaic on the Sadr region processed in HOO and SHO palettes. This was my first mosaic processed entirely in Pixinsight. Each panel has about 3 hrs of integration time captured over several nights.