There's five echos, actually. (Look north, northwest, W, SW and S) Internal reflections, probably. HD 84406 is fairly bright, magnitude 6, eye-visible. In one

There's five echos, actually. (Look north, northwest, W, SW and S) Internal reflections, probably. HD 84406 is fairly bright, magnitude 6, eye-visible. In one of the blog posts they say it's too bright to be imaged in normal operations: https://blogs.nasa.gov/webb/2022/01/27/the-webb-team-looks-back-on-successful-deployments/ https://blogs.nasa.gov/webb/2022/01/27/the-webb-team-looks-b... (You don't spend tens of billions to put a telescope into orbit just to look at HD catalog stars) All the other sensor cruft would go away with dark-frame subtraction: https://en.wikipedia.org/wiki/Dark-frame_subtraction https://en.wikipedia.org/wiki/Dark-frame_subtraction They're apparently not bothering with that for mirror alignment photos. Another safe bet is that a bunch of the sensor noise is because all the instruments are still warm. NIRCAM is still at 42K, and MIRI is hotter. https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.htm... It doesn't look like they've turned on the instrument coolers yet.