Hello! I'm doing astrophotography just since a few months. My equipment is a Celestron 9.25 SCT, with an f/6.3 reducer, a Nikon DSLR camera and an intervalometer. Yesterday night I made a series of 90-second photos of IC2944 (the Running Chicken Nebula). The brightest star there is Lambda Centauri. When I reviewed the photos a few hours ago, I noticed in one of them a very strange image, immediately to the left of the star. I wonder if someone can tell me what is that. I'm attaching two consecutive pictures, one "normal" and the other showing the image. They are unedited, I only converted the photos from NEF to JPG. Thanks.