The OSIRIS-REx spacecraft represents a pivotal mission in the field of space exploration and planetary science. Its main goal is to visit 101955 Bennu, a carbon-rich near-Earth asteroid, to study its composition, map its surface, and ultimately return a sample to Earth. This mission is of great scientific importance as it aims to provide insights into the early solar system and the origins of organic compounds that could have seeded life on Earth.
OSIRIS-REx Mission Overview
Launched by NASA in September 2016, the Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) spacecraft embarked on a journey to rendezvous with asteroid Bennu. The asteroid was chosen because of its potentially hazardous orbit, its primitive carbonaceous composition, and its accessibility. The mission’s objectives include mapping the asteroid, studying its composition, understanding its orbit, and returning at least 60 grams of its material to Earth.
Final Flyover of Bennu
Scheduled for April 7th, OSIRIS-REx is set to undertake its last close encounter with Bennu. During this flyover, the spacecraft will perform a final series of imaging maneuvers to capture detailed pictures of the asteroid’s surface. This event is significant as it will allow scientists to observe changes to the surface of Bennu following the Touch-and-Go Sample Collection event that occurred the previous year.
Touch-and-Go Sample Collection Event
In October 2020, OSIRIS-REx achieved a major milestone by successfully touching down on Bennu’s surface in a maneuver known as the Touch-and-Go (TAG) sample collection event. During this brief contact, the spacecraft extended its robotic arm to disturb the surface and collect samples of regolith – the loose rocks and dust covering the asteroid. The operation was a success, and the spacecraft gathered a substantial amount of material, exceeding the mission’s minimum requirement.
Studying Disturbances Post-Sample Collection
The additional flyover is a strategic move by the mission team to study the consequences of the TAG event. By comparing the before and after images, researchers can gain a better understanding of how the spacecraft’s contact with the asteroid’s surface altered its landscape. This information is crucial for future missions that aim to interact with small celestial bodies, as it provides data on how these bodies react to external forces.
Return Journey to Earth
After completing its final tasks at Bennu, OSIRIS-REx will prepare for its voyage back to Earth. The spacecraft is scheduled to depart Bennu’s vicinity in May and begin its two-year journey home. Upon arrival, the sample capsule will be ejected and directed towards Earth’s atmosphere, landing in the Utah desert in September 2023. The samples inside will then be transported to NASA’s Johnson Space Center for analysis.
Scientific Goals and Expectations
The primary scientific goal of the OSIRIS-REx mission is to increase our knowledge of the building blocks of the solar system. Bennu is a time capsule from the early solar system, containing material that has remained largely unchanged for billions of years. By studying its composition, scientists hope to learn more about the presence of water and organic molecules on asteroids, which may have implications for understanding the origin of life on Earth.
Impact on Future Missions
The success of OSIRIS-REx has far-reaching implications for future exploratory missions. Not only does it demonstrate the feasibility of collecting samples from an asteroid, but it also provides valuable experience in navigating and operating around such small bodies. The data collected from this mission will inform the design and planning of future missions to other asteroids, comets, and possibly even the moons of Mars.
By undertaking this ambitious mission, OSIRIS-REx has set the stage for a new era of space exploration, where humanity reaches out to touch the remnants of our solar system’s formation and brings them back to our world for study and wonder.
Last Modified: February 19, 2024