booNyzarC, on 31 October 2012 - 02:40 PM, said:
Hi James. Can you clear up a question for us?
MacGuffin seems to be under the impression that you have commented regarding photo
AS11-36-5319, saying that it is space junk. If you would be so kind as to clarify whether or not this is the case, I'd appreciate it.
You're right, it's an occasion worth recognizing and celebrating. McG has read, understood, and accurately relayed something he read by me. Let's not get too excited about this anomaly.
I think the shot captured some of the 'stuff' coming off the vehicle, of what nature it's impossible to tell because there so much of it from varied sources.
I call it 'spacecraft dandruff', to explicitly differentiate it from 'space junk' in its traditional sense of pieces of OTHER spacecraft tracked in different orbits that may criss-cross one's own path. 'Space dandruff' is rarely tracked on radar, it's too small and so light it usually drops out of orbit and burns up in days or weeks at most.
It's slowly dawned on me that traditional 'space junk' is extremely infrequently seen by astronauts or their external cameras. It's moving too fast, and it's usually too small, to ever be detectable.
Other vehicles flying parallel paths, for rendezvous, brief free-flight episodes, or after separation, often appear on youtube as UFOs. Skylab crews saw their own massive S-2 Saturn launch vehicle upper stage occasionally as it 'lapped' them in orbit every few days.
Some astronauts [eg Don Pettit] ran special observation programs for Iridium flares, successfully. And there are a very few images that might be fortuitous detections of large mid-distance other satellites, such as a NOSS triplet. But 'space junk' -- hardly ever at all, I've come to believe.
'Space dandruff'? Almost every day and twice on Sundays.