NASA's OSIRIS-APEX Completes 1st Perihelion

Reuters Events SMR and Advanced Reactor 2025

NASA's OSIRIS-APEX Completes 1st Perihelion
by Clarence Oxford
Los Angeles CA (SPX) Feb 22, 2024

NASA's OSIRIS-APEX spacecraft has successfully navigated its closest approach to the Sun. This maneuver, known as perihelion, brought the spacecraft 25 million miles closer to the Sun than its initial design parameters. The spacecraft, formerly known as OSIRIS-REx, undertook a critical adjustment during this perihelion on January 2, repositioning one of its solar arrays to shield vital components from the Sun's intense heat. This allowed OSIRIS-APEX to endure temperatures far exceeding its original design limits. As it moved away from the Sun's vicinity in early February, the spacecraft realigned its solar array to resume power generation, a testament to the mission team's ingenuity and the spacecraft's adaptability.

The journey to perihelion was not without its challenges. Since early December 2023, the mission team has navigated the complexities of limited telemetry, a necessary concession to safeguard the spacecraft from the Sun's harsh environment. This configuration restricted high-speed communications with Earth, leaving the team in anticipation of the full scope of data OSIRIS-APEX collected during its closest approach.

In mid-March, a significant milestone awaits as the team plans to reorient the spacecraft's high-gain antenna towards Earth. This maneuver will enable the download of invaluable data gathered during the perihelion, offering insights into the spacecraft's performance under extreme conditions and potentially unlocking new scientific discoveries.

The initial assessment suggests that OSIRIS-APEX has performed admirably, adhering to predictions and showcasing the resilience of its design and operational planning. A comprehensive evaluation of the spacecraft's health and the impact of the Sun's proximity on its instruments and components will unfold in the coming months. Engineers anticipate conducting tests on the spacecraft's instruments in early April, with a detailed health assessment scheduled for May.

OSIRIS-APEX's encounter with the Sun is just the beginning of an intricate dance of seven perihelions designed to propel the spacecraft towards its ultimate target, the asteroid Apophis, in April 2029. Each subsequent perihelion, save for one, will bring the spacecraft within 46.5 million miles of the Sun, each maneuver critical in refining its trajectory towards this near-Earth asteroid.

The mission to Apophis, following the successful sample collection from asteroid Bennu, represents a continuation of NASA's efforts to understand the origins of our solar system and the dynamics of near-Earth objects. Apophis, known for its close approaches to Earth, offers a unique opportunity to study the characteristics of potentially hazardous asteroids and enhance our understanding of how to mitigate any future threats.