NASA's Van Allen Probe A Satellite to Re-enter Earth's Atmosphere

NASA's Van Allen Probe A satellite, weighing approximately 1,323 pounds (600 kg), is expected to partially crash into Earth on Tuesday evening. According to the U.S. Space Force, the spacecraft will re-enter Earth’s atmosphere around 7:45 PM EDT with a margin of uncertainty of plus or minus 24 hours.

The satellite, one of twin probes launched in August 2012 from Cape Canaveral, Florida, was designed to investigate the Van Allen radiation belts. Most components are expected to burn up during re-entry, but some may survive. The risk of harm to anyone on Earth is low, estimated at approximately 1 in 4,200, according to NASA.

The mission aimed to explore Earth's permanent radiation belts and determine how particles within them are gained and lost. Although the probes were designed for a two-year mission, they operated for nearly seven years before being deactivated in 2019 due to fuel depletion. The current active solar cycle has triggered intense space weather events, increasing atmospheric drag on the spacecraft and causing an earlier-than-expected re-entry.

NASA emphasizes that the data collected from the Van Allen Probes mission continues to play a crucial role in understanding space weather and its effects. This includes predicting how solar activity impacts satellites, astronauts, and systems on Earth such as communications, navigation, and power grids.

The exact location of re-entry is not immediately clear. NASA and the U.S. Space Force will monitor the re-entry and update predictions as necessary. The mission made significant discoveries, including the first data showing the existence of a transient third radiation belt during times of intense solar activity.