Descripción : Lollini maximum card with Pasadena illustrated post stamp.
Spitzer is the only one of the Great Observatories not launched by the Space Shuttle, which had been originally intended. However after the 1986 Challenger disaster, the Centaur LH2/LOX upper stage, which would have been required to place it in its final orbit, was banned from Shuttle use. The mission underwent a series of redesigns during the 1990s, primarily due to budget considerations. This resulted in a much smaller but still fully capable mission which could use the smaller Delta II expendable launch vehicle.

USA 2701 B - image retouchée ?

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SPITZER · INFRARED TELESCOPE (SIRTF) (SST) · DELTA 7920 H (FIRST FLIGHT)