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Mission record

GRAIL

Also known as Ebb, GRAIL-A

National Aeronautics and Space Administration · Launched

Explore trajectory

Completed · Success

Twin NASA orbiters that flew in formation to map the Moon's gravitational field in unprecedented detail before impacting the surface together.

Destinations
Moon
Launch vehicle
Delta II
Launch site
Cape Canaveral, United States
Countries
United States
Mission types
Orbiter

Chronology

Mission timeline

  1. Launch

    GRAIL-A and GRAIL-B launched together on a single Delta II

  2. Orbit insertion

    GRAIL-A executed its lunar orbit insertion manoeuvre

    Moon

  3. Orbit insertion

    GRAIL-B executed its lunar orbit insertion manoeuvre

    Moon

  4. Impact

    Both spacecraft ended the mission with lunar surface impacts

    Moon

Mission architecture

Vehicles

  • Ebb · Orbiter

    Destinations: Moon

  • Flow · Orbiter

    Destinations: Moon

Trajectory record

Trajectory dataset not yet available

No verified trajectory dataset is committed for this mission, so Mission Atlas renders no path.

Provenance

Sources

Each source is listed once and labeled with the mission, event, trajectory, or destination/body context it supports.

Data verified through August 27, 2026