IC434  Region  -- "Artifact" in lower right  45 minute exposure Ha with TMB152 f8  STL6303

The scope was moved to reframed object to rule out dust motes.  25 minutes later, the artifact moved to the right.
This was a 30 second exposure binned 3x3

Detail-A    This is a detail from the initial 45 minute exposure, relative to the Horse Head.

Detail-B  This detail was processed to show some of the structure of the "artifact".