Discovering the origins of the solar system.


OSIRIS-REx Delivers Samples of Asteroid Bennu to Earth


The OSIRIS-REx sample return capsule rests on the ground in the Utah desert


NASA's OSIRIS-REx spacecraft has delivered samples to Earth that it collected during its historic seven-year mission to asteroid Bennu, a carbon-rich asteroid that could hold clues about the development of the solar system.

At 4:43 a.m. MT on Sunday, Sept. 24, 2023, the sample return capsule (SRC) was released from the OSIRIS-REx spacecraft, which initiated a diversion burn and is now entering its extended mission as OSIRIS-APEX to study asteroid Apophis. After coasting for about four hours, the SRC began its decent through the atmosphere, where it reached speeds of almost 27,000 mph and temperatures of nearly 5,000°F. Following this fast and fiery 13-minute entry and descent, the SRC touched down in the Utah desert at 8:52 a.m. MT.

The SRC is estimated to hold about a cup of material from Bennu, a carbon-rich asteroid that scientists hope it will teach us more about the origin of organics that led to life on Earth and help us better understand planet formation.


The OSIRIS-REx recovery team approaches the sample return capsule
The OSIRIS-REx sample return capsule is airlifted from its landing site in the Utah desert
Photo Credits: NASA/Keegan Barber

OSIRIS-REx Mission

NASA’s OSIRIS-REx mission will study a near-Earth asteroid. The Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer, or OSIRIS-REx, mission is NASA’s third New Frontiers science mission and is led by the University of Arizona and managed by NASA’s Goddard Space Flight Center.

Launched on Sept. 8, 2016, the spacecraft will rendezvous with asteroid Bennu, conduct a two-year detailed survey of Bennu from orbit, and collect a sample and bring it back to Earth. The sample will be the first for a U.S. mission, giving insight into the early formation of our solar system, and may provide clues to the origin of life on Earth.

Lockheed Martin designed and built the OSIRIS-REx spacecraft, asteroid sampling system and sample return capsule at its facilities near Denver. The company is also operating the spacecraft from its Mission Support Area from launch through sample return.

Key Mission Dates:

  • Launch: Sept. 8, 2016
  • Earth Flyby: September 2017
  • Asteroid Operations: Begin August 2018
  • Touch-And-Go Sample Collection: October 2020
  • Asteroid Departure Maneuver: March 2021
  • Sample Return to Earth: Sept. 24, 2023
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The Spacecraft

OREx build

The OSIRIS-REx spacecraft draws from a strong heritage of Lockheed Martin’s previous planetary spacecraft, while incorporating innovative technologies that make this sample return mission possible.  When you look at OSIRIS-REx, its structures and subsystems can be traced back to MAVEN, Juno and Mars Reconnaissance Orbiter. The sample return capsule comes directly from the Stardust comet sample return mission.

The specific composition of the asteroid is unknown. In order to a collect sample from its surface, Lockheed Martin developed an innovative first-of-its-kind sample collection method and hardware. The Touch-And-Go Sample Acquisition Mechanism (TAGSAM) is an elegantly-simple device that acts as a “reverse vacuum,” blowing compressed nitrogen gas to stir up regolith (dirt) from Bennu and collecting it in a special ring-shaped canister. It will collect between 60 and 2,000 grams (2.1 – 70 ounces) of material.

OSIRIS-REx has a suite of instruments to thoroughly measure and map the asteroid, including visible-light cameras, infrared spectrometers, an x-ray spectrometer and active-scanning LIDAR. These tools will provide incredibly detailed information about Bennu.

Spacecraft Stats:

  • Length: 20.25 feet (6.2 m, with solar panels deployed)
  • Width: 8 feet (2.43 m) x 8 feet (2.43 m)
  • Height: 10.33 feet (3.15 m)
  • TAGSAM Length: 11 feet (3.35 m)
  • Dry Mass (unfueled): 1,940 pounds (880 kg)
  • Wet Mass (fueled): 4,650 pounds (2,110 kg)
  • Power: Two solar panels generate between 1,226 watts and 3,000 watts depending on the spacecraft’s distance from the sun.
  • Solar Arrays 8.5 sq/meter (91.5 sq/ft) on 2-axis gimbals

Distance to Bennu

Distance to travel to Bennu: 509 million miles, relative to Earth


Total distance traveled for mission: nearly 4 billion miles round trip, relative to Earth

Catching Up

As Bennu orbits around the sun at 61,300 mph, OSIRIS-REx will need to reach a point in the asteroid’s path at the exact same time as the asteroid, all while moving at the same speed and in the same direction.

Sample Return

The Sample Return Capsule will reach a top speed of 27,700 mph as it comes through the Earth’s atmosphere. This is the second fastest man-made object to return to Earth as the Lockheed Martin-built Stardust capsule came back to Earth at 28,185 mph.