A paint flake fooled the star sensor - could Mariner 4 make Mars on time?
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A paint flake fooled the star sensor - could Mariner 4 make Mars on time?
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A paint flake fooled the star sensor - could Mariner 4 make Mars on time?
In this episode, we follow the final weeks of the Mariner 4 mission as engineers race against a closing launch window and a ticking clock. The crew at JPL confronts hardware compromises, failed tests, and a navigation system being tricked by debris - but will the spacecraft arrive with its cameras correctly pointed?
Mission: Mariner 4
Date: November-December 1964
Location: Jet Propulsion Laboratory / en route to Mars
Event: Star sensor failures and navigation challenges
Status: Eight-month voyage in progress
- Engineers hand-colored the first low-resolution image of Mars by filling numbered squares while the computer finished processing.
- Mariner 3 failed on launch when its payload shroud failed to jettison, prompting a three-week crash redesign of the shroud material and tests.
- Mariner 4 launched Nov 28, 1964 with a spare tape recorder pressed into service because of time constraints.
- The navigation system used Canopus as a single-star reference and began repeatedly acquiring and losing other bright stars during flight.
- Paint flakes and dust near the star sensor created false bright points that intermittently fooled the lock algorithm, affecting camera orientation.
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