The tiny reserve of propellant that nursed the satellite back to orbit in time
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The tiny reserve of propellant that nursed the satellite back to orbit in time
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The tiny reserve of propellant that nursed the satellite back to orbit in time
In this episode, we follow the maiden flight of Space Shuttle Challenger and the crisis that unfolded when TDRS‑1 ended up in a wrong, low elliptical orbit. The story tracks the decisions, technical failures, and the burn-by-burn effort that relied on an unexpected propellant margin-could that small reserve save the mission?
Date: April 4, 1983
Vehicle: Space Shuttle Challenger
Payload: TDRS‑1 (Tracking and Data Relay Satellite)
Mass: 2300 kilograms
Cost: $100 million
- Challenger rolled out to Launch Complex 39A on December 8, 1982, as the second orbiter in the Shuttle fleet.
- Pre-flight engine firings in December and January revealed hydrogen leaks and cracked low-pressure ducting, forcing multiple engine removals and replacements.
- A February storm contaminated TDRS‑1 in the Payload Changeout Room, requiring the satellite to be returned for cleaning and delaying the schedule.
- Challenger’s crew-Weitz, Bobko, Peterson, and Musgrave-were on their first shuttle flight, with Musgrave and Peterson slated for the first US spacewalk in nearly a decade.
- After TDRS‑1 deployed and its Inertial Upper Stage ignited, the booster began tumbling and losing attitude, burning propellant off-target while teams on the ground weighed whether a small onboard reserve could salvage the satellite.
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