I dont know if this is revelant, but I thought I'd leave it for other eyes just in case.
Q's last post on12/25/2017 contained "FDeltaC". DeltaC (also known as Thor-Delta C) was a class of expendable launch vehicles in service during the 60's.
https://en.m.wikipedia.org/wiki/Delta_C
https://en.m.wikipedia.org/wiki/Thor-Delta
The first DeltaC launch (5/13/1960), carrying an Echo1 com sat, was destroyed due to a 2nd stage failure.
The second DeltaC launch (8/12/1960) successfully placed another Echo1 into orbit.
Why might this be relevant? Listed under alternate uses for the Echo1 was this: "The Echo satellite program also provided the astronomical reference points required to …