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Mercury Little Joe Launch Vehicle

Little Joe was a low-cost, solid-propellant test launch vehicle developed for Project Mercury to reproduce critical portions of Atlas ascent without using an Atlas. Eight identified test articles supported escape-system, aerodynamic, structural, recovery, and biomedical objectives at Wallops Island from 1959 to 1961; seven boosters flew, while LJ-1 remained on the pad during an accidental escape-tower firing. The program qualified key Mercury abort concepts before crewed orbital flight.

Mercury Little Joe Launch Vehicle
NASA/Johnson Space Center · Stored/public JPEG is byte-identical to NASA's canonical s61-01690 original (4093x4837, SHA-256 edf714ebea61b185542da61fd8709ad7208463698ea0d725814ca43476476450). NASA Images API identifies the exact asset as “LITTLE JOE 5B - SPACECRAFT #14 - CAPE” and describes the Little Joe-5B launch from Wallops Island on April 28, 1961, with NASA photo credit: https://images-api.nasa.gov/search?q=s61-01690&media_type=image&page_size=20. NASA's official Project Mercury uncrewed-missions material documents Little Joe 5B as a Mercury test mission: https://www.nasa.gov/missions/project-mercury/project-mercury-uncrewed-missions/. NASA current Images and Media Usage Guidelines permit factual or informational use of NASA content with NASA acknowledged where no third-party rights are indicated, while NASA logos and identifiers remain protected and use must not imply endorsement: https://www.nasa.gov/nasa-brand-center/images-and-media/. This is an asset-level, conservative factual/editorial reuse basis with NASA/Johnson Space Center attribution, not a blanket license for promotional use, merchandise, NASA branding, or endorsement. · Source
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Identity

Aliases
Mercury Little JoeLittle Joe ILittle Joe 1
Family Name
Little Joe
Full Name
Mercury Little Joe Launch Vehicle
Status
retired
Type
rocket

Details

Description
Little Joe was a low-cost, solid-propellant test launch vehicle developed for Project Mercury to reproduce critical portions of Atlas ascent without using an Atlas. Eight identified test articles supported escape-system, aerodynamic, structural, recovery, and biomedical objectives at Wallops Island from 1959 to 1961; seven boosters flew, while LJ-1 remained on the pad during an accidental escape-tower firing. The program qualified key Mercury abort concepts before crewed orbital flight.
First Flight Year
1,959
Last Flight Year
1,961
Manufacturer
Operator
Rocket Specs
Reusability
expendable

Links

Official Url
https://www.nasa.gov/missions/project-mercury/project-mercury-uncrewed-missions/

Assets & Meta

Creation Time
July 13, 2026 at 13:01:57 UTC
Updated Time
July 19, 2026 at 03:47:14 UTC
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Search Name
Mercury Little Joe Launch Vehicle Mercury Little Joe Little Joe I Little Joe 1