Here is everything I have on this subject
[link to www.northernmichigansolar.com
This is from my article on the server.
It is said that in 1957 the blip of unknown origin was discovered as it was detected shadowing the sputnik 1 craft It was in a polar orbit. This object was dubbed "The Black Knight”. It was several times larger and several times heavier than anything capable of being launched with 1960 rockets. It shouldn’t have been there, but it was.
In 1953, four years before the U.S.S.R. launched Sputnik I, it was sighted by Dr Lincoln La Paz of the University of New Mexico. As more reports of sightings trickled in from around the world, the U.S. Department of Defense appointed distinguished astronomer Clyde W. Tombaugh to run a search for the mystery object. He had discovered Pluto in 1930.
The Pentagon never formally released the results of Dr Tombaugh's study. And no more was heard about the object until December, 1957, when Dr Luis Corralos of the Communications Ministry in Venezuela photographed it. The first modern satellite, Sputnik I, had been launched two months earlier. Dr Corralos was taking pictures of Sputnik II as it passed over Caracas.
These are publications that have investigated the Black Knight.
Macvey, J.W., "Whispers From Space" p. 193, Abelard Schuman, London 1973.
Lawton, A.T., and Newton, S. J. "Long Delayed Echoes: the Search for a Solution" pp. 181-187 Vol. 6 No. 5 May 1974.
Vidmar, F. R. and Crawford, F. W., "Long-Delayed radio Echoes: Mechanisms and Observations" Journal of Geophysical Research 90:1523, 1985.
Strauss, Stephen, "NASA Proposes Journey To The Stars" p. A8, Globe and Mail (Toronto) 4th July 1977.
The Times 28th September 1998 p. 15
‘Spaceship Moon’ p. 254